TY  - JOUR
AU  - Brzić, Danica
AU  - Pešić, Radojica
AU  - Arsenijević, Zorana
AU  - Đuriš, Mihal
AU  - Bošković-Vragolović, Nevenka
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5052
AB  - The present work concerns an experimental study on heat transfer in gas-solid fluidized bed of coarse (Geldart D) particles to a larger immersed sphere at high superficial velocities from 2 to 5.5 Umf. The heat transfer coefficient was determined by measuring the temperature of the test sphere during its heating in a fluidized bed in the temperature range of 65–175 °C. The test spheres of different sizes and different materials were utilized. For the given gas-particles system the flow regime changes from rapidly growing bubbles to turbulent fluidization at superficial velocity Uc ≈ 3Umf. It has been found that in rapidly growing bubbles regime, the heat transfer coefficient is higher for smaller test spheres while it is almost independent of the superficial gas velocity. In turbulent regime, the heat transfer coefficient increases with increase of gas velocity while the size of the test sphere exhibits less influence. In the rapidly growing bubbles regime, experimental data for heat transfer coefficient can be predicted adequately with correlation of Scott et al.. For the turbulent flow regime a new correlation for prediction of the heat transfer coefficient has been proposed.
PB  - Taylor & Francis Online
T2  - Particulate Science and Technology
T1  - Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime
EP  - 83
IS  - 1
SP  - 75
VL  - 41
DO  - https://doi.org/10.1080/02726351.2022.2053015
ER  - 

@article{
author = "Brzić, Danica and Pešić, Radojica and Arsenijević, Zorana and Đuriš, Mihal and Bošković-Vragolović, Nevenka and Kaluđerović-Radoičić, Tatjana",
year = "2022",
abstract = "The present work concerns an experimental study on heat transfer in gas-solid fluidized bed of coarse (Geldart D) particles to a larger immersed sphere at high superficial velocities from 2 to 5.5 Umf. The heat transfer coefficient was determined by measuring the temperature of the test sphere during its heating in a fluidized bed in the temperature range of 65–175 °C. The test spheres of different sizes and different materials were utilized. For the given gas-particles system the flow regime changes from rapidly growing bubbles to turbulent fluidization at superficial velocity Uc ≈ 3Umf. It has been found that in rapidly growing bubbles regime, the heat transfer coefficient is higher for smaller test spheres while it is almost independent of the superficial gas velocity. In turbulent regime, the heat transfer coefficient increases with increase of gas velocity while the size of the test sphere exhibits less influence. In the rapidly growing bubbles regime, experimental data for heat transfer coefficient can be predicted adequately with correlation of Scott et al.. For the turbulent flow regime a new correlation for prediction of the heat transfer coefficient has been proposed.",
publisher = "Taylor & Francis Online",
journal = "Particulate Science and Technology",
title = "Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime",
pages = "83-75",
number = "1",
volume = "41",
doi = "https://doi.org/10.1080/02726351.2022.2053015"
}

Brzić, D., Pešić, R., Arsenijević, Z., Đuriš, M., Bošković-Vragolović, N.,& Kaluđerović-Radoičić, T.. (2022). Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime. in Particulate Science and Technology
Taylor & Francis Online., 41(1), 75-83.
https://doi.org/https://doi.org/10.1080/02726351.2022.2053015

Brzić D, Pešić R, Arsenijević Z, Đuriš M, Bošković-Vragolović N, Kaluđerović-Radoičić T. Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime. in Particulate Science and Technology. 2022;41(1):75-83.
doi:https://doi.org/10.1080/02726351.2022.2053015 .

Brzić, Danica, Pešić, Radojica, Arsenijević, Zorana, Đuriš, Mihal, Bošković-Vragolović, Nevenka, Kaluđerović-Radoičić, Tatjana, "Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime" in Particulate Science and Technology, 41, no. 1 (2022):75-83,
https://doi.org/https://doi.org/10.1080/02726351.2022.2053015 . .

TY  - JOUR
AU  - Cvetković, Slobodan M.
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Grbović-Novaković, Jasmina
AU  - Kovačević, Vlado
AU  - Lopičić, Zorica
AU  - Adamović, Vladimir
AU  - Kijevčanin, Mirjana
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5151
AB  - Renewable hydrogen produced from the waste streams can be a good option for clean energy production and reduction of greenhouse gases emissions into the environment. In this study, the potential for hydrogen production from the food industry wastewaters in Serbia and the further use of the calculated potentials were investigated. This was performed through two technological routes including the biogas steam reforming process and the electrolysis after biogas cogeneration process. Furthermore, the environmental impacts of these processes were considered. The total hydrogen potential via the biogas steam reforming process was 4094.70 tons, while the total hydrogen potential via the electrolysis after biogas cogeneration process was 1751.08 tons. These potentials can be used for direct energy production in the food industry, electricity production for the national electric grid, transport, injection in the natural gas grid and/or as a resource in the chemical industry. Regarding the Greenhouse Gas emissions reduction, hydrogen production by both routes represents a promising pathway. The results of this work can serve the decision makers to plan hydrogen application in the energy sector of the Republic of Serbia defining supporting measures for its application. Also, the presented analysis is enforceable in the Western Balkan countries for the application of hydrogen as an energy source in their systems for energy production, transport and economy.
PB  - Elsevier Ltd
T2  - Journal of Cleaner Production
T1  - Renewable hydrogen production perspective in Serbia via biogas generated from food processing wastewaters
SP  - 132142
VL  - 363
DO  - 10.1016/j.jclepro.2022.132142
ER  - 

@article{
author = "Cvetković, Slobodan M. and Kaluđerović-Radoičić, Tatjana and Grbović-Novaković, Jasmina and Kovačević, Vlado and Lopičić, Zorica and Adamović, Vladimir and Kijevčanin, Mirjana",
year = "2022",
abstract = "Renewable hydrogen produced from the waste streams can be a good option for clean energy production and reduction of greenhouse gases emissions into the environment. In this study, the potential for hydrogen production from the food industry wastewaters in Serbia and the further use of the calculated potentials were investigated. This was performed through two technological routes including the biogas steam reforming process and the electrolysis after biogas cogeneration process. Furthermore, the environmental impacts of these processes were considered. The total hydrogen potential via the biogas steam reforming process was 4094.70 tons, while the total hydrogen potential via the electrolysis after biogas cogeneration process was 1751.08 tons. These potentials can be used for direct energy production in the food industry, electricity production for the national electric grid, transport, injection in the natural gas grid and/or as a resource in the chemical industry. Regarding the Greenhouse Gas emissions reduction, hydrogen production by both routes represents a promising pathway. The results of this work can serve the decision makers to plan hydrogen application in the energy sector of the Republic of Serbia defining supporting measures for its application. Also, the presented analysis is enforceable in the Western Balkan countries for the application of hydrogen as an energy source in their systems for energy production, transport and economy.",
publisher = "Elsevier Ltd",
journal = "Journal of Cleaner Production",
title = "Renewable hydrogen production perspective in Serbia via biogas generated from food processing wastewaters",
pages = "132142",
volume = "363",
doi = "10.1016/j.jclepro.2022.132142"
}

Cvetković, S. M., Kaluđerović-Radoičić, T., Grbović-Novaković, J., Kovačević, V., Lopičić, Z., Adamović, V.,& Kijevčanin, M.. (2022). Renewable hydrogen production perspective in Serbia via biogas generated from food processing wastewaters. in Journal of Cleaner Production
Elsevier Ltd., 363, 132142.
https://doi.org/10.1016/j.jclepro.2022.132142

Cvetković SM, Kaluđerović-Radoičić T, Grbović-Novaković J, Kovačević V, Lopičić Z, Adamović V, Kijevčanin M. Renewable hydrogen production perspective in Serbia via biogas generated from food processing wastewaters. in Journal of Cleaner Production. 2022;363:132142.
doi:10.1016/j.jclepro.2022.132142 .

Cvetković, Slobodan M., Kaluđerović-Radoičić, Tatjana, Grbović-Novaković, Jasmina, Kovačević, Vlado, Lopičić, Zorica, Adamović, Vladimir, Kijevčanin, Mirjana, "Renewable hydrogen production perspective in Serbia via biogas generated from food processing wastewaters" in Journal of Cleaner Production, 363 (2022):132142,
https://doi.org/10.1016/j.jclepro.2022.132142 . .

TY  - JOUR
AU  - Cvetkovic, Slobodan M.
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Kijevčanin, Mirjana
AU  - Grbovic-Novakovic, Jasmina
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4886
AB  - The aim of this paper is to demonstrate and to quantify energy flows in a life cycle of biogas to biohydrogen production, starting from feedstock materials via anaerobic digestion, biogas upgrading, biohydrogen production, to the end of biogas system (application of digestate as fertilizer in agriculture). The performance of the biogas plant of Mirotin dairy farm in Serbia has been assessed. According to Life Cycle Energy Assessment approach, results obtained in this study have shown that biohydrogen production via biogas steam reforming has negative energy balance (with -16,837 GJ). It has also been demonstrated that this process is energy unsustainable in an environmental context. In future analysis it would be necessary to consider the other aspects of sustainability, e.g. the economical and social factors in order to estimate the overall sustainability of the biogas utilization pathways, especially having in mind that the technology of converting biogas to hydrogen is still in the development phase.
T2  - International Journal of Hydrogen Energy
T1  - Life Cycle Energy Assessment of biohydrogen production via biogas steam reforming: Case study of biogas plant on a farm in Serbia
EP  - 14137
IS  - 27
SP  - 14130
VL  - 46
DO  - 10.1016/j.ijhydene.2021.01.181
ER  - 

@article{
author = "Cvetkovic, Slobodan M. and Kaluđerović-Radoičić, Tatjana and Kijevčanin, Mirjana and Grbovic-Novakovic, Jasmina",
year = "2021",
abstract = "The aim of this paper is to demonstrate and to quantify energy flows in a life cycle of biogas to biohydrogen production, starting from feedstock materials via anaerobic digestion, biogas upgrading, biohydrogen production, to the end of biogas system (application of digestate as fertilizer in agriculture). The performance of the biogas plant of Mirotin dairy farm in Serbia has been assessed. According to Life Cycle Energy Assessment approach, results obtained in this study have shown that biohydrogen production via biogas steam reforming has negative energy balance (with -16,837 GJ). It has also been demonstrated that this process is energy unsustainable in an environmental context. In future analysis it would be necessary to consider the other aspects of sustainability, e.g. the economical and social factors in order to estimate the overall sustainability of the biogas utilization pathways, especially having in mind that the technology of converting biogas to hydrogen is still in the development phase.",
journal = "International Journal of Hydrogen Energy",
title = "Life Cycle Energy Assessment of biohydrogen production via biogas steam reforming: Case study of biogas plant on a farm in Serbia",
pages = "14137-14130",
number = "27",
volume = "46",
doi = "10.1016/j.ijhydene.2021.01.181"
}

Cvetkovic, S. M., Kaluđerović-Radoičić, T., Kijevčanin, M.,& Grbovic-Novakovic, J.. (2021). Life Cycle Energy Assessment of biohydrogen production via biogas steam reforming: Case study of biogas plant on a farm in Serbia. in International Journal of Hydrogen Energy, 46(27), 14130-14137.
https://doi.org/10.1016/j.ijhydene.2021.01.181

Cvetkovic SM, Kaluđerović-Radoičić T, Kijevčanin M, Grbovic-Novakovic J. Life Cycle Energy Assessment of biohydrogen production via biogas steam reforming: Case study of biogas plant on a farm in Serbia. in International Journal of Hydrogen Energy. 2021;46(27):14130-14137.
doi:10.1016/j.ijhydene.2021.01.181 .

Cvetkovic, Slobodan M., Kaluđerović-Radoičić, Tatjana, Kijevčanin, Mirjana, Grbovic-Novakovic, Jasmina, "Life Cycle Energy Assessment of biohydrogen production via biogas steam reforming: Case study of biogas plant on a farm in Serbia" in International Journal of Hydrogen Energy, 46, no. 27 (2021):14130-14137,
https://doi.org/10.1016/j.ijhydene.2021.01.181 . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Garić-Grulović, Radmila
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4462
AB  - In this study, we applied the variational model to fluidization of small spherical particles. Fluidization experiments were carried out for spherical particles with 13 diameters between d(p) = 0.13 and 5.00 mm. We propose a generalized form of our variational model to predict the superficial velocity U and interphase drag coefficient beta by introducing an exponent n to describe the different dependences of the drag force F-d on fluid velocity for different particle sizes (different flow regimes). By comparing the predictions with the experimental results, we conclude that n=1 should be used for small particles (d(p)  lt  1 mm) and n = 2 for larger particles (d(p)  gt  1 mm). This conclusion is generalized by proposing n = 1 for particles with Re-t  lt  160 and n = 2 for particles with Re-t  gt  160. The average mean absolute error was 5.49% in calculating superficial velocity for different bed voidages using the modified variational model for all of the particles examined. The calculated values of beta were compared with values of literature models for particles with d(p)  lt  1.0 mm. The average mean absolute error of the modified variational model was 8.02% in calculating beta for different bed voidages for all of the particles examined.
PB  - Elsevier Science Inc, New York
T2  - Particuology
T1  - Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles
EP  - 192
SP  - 184
VL  - 51
DO  - 10.1016/j.partic.2019.11.002
ER  - 

@article{
author = "Đuriš, Mihal and Arsenijević, Zorana and Garić-Grulović, Radmila and Kaluđerović-Radoičić, Tatjana",
year = "2020",
abstract = "In this study, we applied the variational model to fluidization of small spherical particles. Fluidization experiments were carried out for spherical particles with 13 diameters between d(p) = 0.13 and 5.00 mm. We propose a generalized form of our variational model to predict the superficial velocity U and interphase drag coefficient beta by introducing an exponent n to describe the different dependences of the drag force F-d on fluid velocity for different particle sizes (different flow regimes). By comparing the predictions with the experimental results, we conclude that n=1 should be used for small particles (d(p)  lt  1 mm) and n = 2 for larger particles (d(p)  gt  1 mm). This conclusion is generalized by proposing n = 1 for particles with Re-t  lt  160 and n = 2 for particles with Re-t  gt  160. The average mean absolute error was 5.49% in calculating superficial velocity for different bed voidages using the modified variational model for all of the particles examined. The calculated values of beta were compared with values of literature models for particles with d(p)  lt  1.0 mm. The average mean absolute error of the modified variational model was 8.02% in calculating beta for different bed voidages for all of the particles examined.",
publisher = "Elsevier Science Inc, New York",
journal = "Particuology",
title = "Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles",
pages = "192-184",
volume = "51",
doi = "10.1016/j.partic.2019.11.002"
}

Đuriš, M., Arsenijević, Z., Garić-Grulović, R.,& Kaluđerović-Radoičić, T.. (2020). Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles. in Particuology
Elsevier Science Inc, New York., 51, 184-192.
https://doi.org/10.1016/j.partic.2019.11.002

Đuriš M, Arsenijević Z, Garić-Grulović R, Kaluđerović-Radoičić T. Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles. in Particuology. 2020;51:184-192.
doi:10.1016/j.partic.2019.11.002 .

Đuriš, Mihal, Arsenijević, Zorana, Garić-Grulović, Radmila, Kaluđerović-Radoičić, Tatjana, "Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles" in Particuology, 51 (2020):184-192,
https://doi.org/10.1016/j.partic.2019.11.002 . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4381
AB  - Fluidization experiments were performed by using spherical and non-spherical particles to examine the sensitivity of the variational model to three input parameters: U-mf, epsilon(mf) and U-t. Several correlations for U-mf, epsilon(mf) and U-t were tested and the results were compared with the experimental values. The variational model's ability to predict the bed expansion (in the form of U = f(epsilon)) and the interphase drag coefficient was investigated by varying the three input variables by +/- 20% compared with their experimental values. The variational model for the bed expansion showed the greatest sensitivity to changes in the epsilon(mf) values. The overestimated values of epsilon(mf) resulted in underestimating U(epsilon), and likewise, the underestimated values of epsilon(mf) resulted in overestimating U(epsilon). The variational model's sensitivity to changes in the U-mf values is also important. Contrary to epsilon(mf), overestimating the values of U-mf resulted in overestimating U(epsilon). The model's least sensitivity was to the U-t value variation, which, if varied by +/- 20% compared with their experimental values, had a negligible effect on the prediction quality. This study aims to examine the sensitivity of the variational model to U-mf,U- U-t and epsilon(mf) values obtained from various correlations, in the absence of experimental values.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Particulate Science and Technology
T1  - Sensitivity analysis of the variational model for the particulate expansion of fluidized beds
EP  - 104
IS  - 1
SP  - 95
VL  - 38
DO  - 10.1080/02726351.2018.1508100
ER  - 

@article{
author = "Đuriš, Mihal and Arsenijević, Zorana and Kaluđerović-Radoičić, Tatjana",
year = "2020",
abstract = "Fluidization experiments were performed by using spherical and non-spherical particles to examine the sensitivity of the variational model to three input parameters: U-mf, epsilon(mf) and U-t. Several correlations for U-mf, epsilon(mf) and U-t were tested and the results were compared with the experimental values. The variational model's ability to predict the bed expansion (in the form of U = f(epsilon)) and the interphase drag coefficient was investigated by varying the three input variables by +/- 20% compared with their experimental values. The variational model for the bed expansion showed the greatest sensitivity to changes in the epsilon(mf) values. The overestimated values of epsilon(mf) resulted in underestimating U(epsilon), and likewise, the underestimated values of epsilon(mf) resulted in overestimating U(epsilon). The variational model's sensitivity to changes in the U-mf values is also important. Contrary to epsilon(mf), overestimating the values of U-mf resulted in overestimating U(epsilon). The model's least sensitivity was to the U-t value variation, which, if varied by +/- 20% compared with their experimental values, had a negligible effect on the prediction quality. This study aims to examine the sensitivity of the variational model to U-mf,U- U-t and epsilon(mf) values obtained from various correlations, in the absence of experimental values.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Particulate Science and Technology",
title = "Sensitivity analysis of the variational model for the particulate expansion of fluidized beds",
pages = "104-95",
number = "1",
volume = "38",
doi = "10.1080/02726351.2018.1508100"
}

Đuriš, M., Arsenijević, Z.,& Kaluđerović-Radoičić, T.. (2020). Sensitivity analysis of the variational model for the particulate expansion of fluidized beds. in Particulate Science and Technology
Taylor & Francis Inc, Philadelphia., 38(1), 95-104.
https://doi.org/10.1080/02726351.2018.1508100

Đuriš M, Arsenijević Z, Kaluđerović-Radoičić T. Sensitivity analysis of the variational model for the particulate expansion of fluidized beds. in Particulate Science and Technology. 2020;38(1):95-104.
doi:10.1080/02726351.2018.1508100 .

Đuriš, Mihal, Arsenijević, Zorana, Kaluđerović-Radoičić, Tatjana, "Sensitivity analysis of the variational model for the particulate expansion of fluidized beds" in Particulate Science and Technology, 38, no. 1 (2020):95-104,
https://doi.org/10.1080/02726351.2018.1508100 . .

TY  - CONF
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Đuriš, Mihal
AU  - Jaćimovski, Darko
AU  - Arsenijević, Zorana
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4190
AB  - In this paper, experimental investigation of the dynamics of the process of fluidized bed granulation was performed, in order to find optimal process conditions and binder concentration to achieve the desired granules development. The experiments were performed in batch system using corn flour as starting material. Ten experiments were performed in which sucrose solution of different concentrations (20, 30, 35 and 40 %) was used as binder. The temperature of the system was kept constant during the granulation process and amounted to 40-50°C. Samples were taken from the fluidized bed at time intervals of 3 min. The dynamics of granulation was examined by determining three different factors (bulk density, moisure content and particle size distribution) for each of the samples. It has been found that bulk density continuously decreases during the granulation process, while in the drying phase it remains constant. Particle size distribution has shown that the average diameter of the projected surface increases uniformly during the process. By comparing all of the three investigated factors, it was shown that the best quality of granules is achieved using 35 % sucrose solution .
AB  - U ovom radu izvršeno je eksperimentalno ispitivanje procesa mokre granulacije u fluidizovanom sloju u cilju pronalaženja optimalnih uslova izvođenja procesa i sastava veziva kojim će se ostvariti željena dinamika razvoja granula. Ispitivanje je izvršeno u šaržnom sistemu, a korišćeno je kukuruzno brašno kao polazni materijal. Izvršeno je 10 eksperimenata u kojima je kao vezivno sredstvo korišćen rastvor saharoze različitih koncentracija: 20, 30, 35 i 40 %. Temperatura je održavana konstantnom tokom procesa granulacije i iznosila je 40-50C. Uzorci su iz sloja uzimani u jednakim vremenskim intervalima od 3 min. Dinamika granulacije ispitivana je određivanjem tri različita faktora (nasipne gustina, vlažnosti i raspodele veličine čestica) za svaki od uzoraka. Utvrđeno je da nasipna gustina kontinualno opada tokom izvođenja procesa granulacije, dok u fazi sušenja ostaje konstantna. Raspodela veličina čestica je pokazala da srednji prečnik projektovane površine ravnomerno raste tokom procesa. Poređenjem sva tri ispitivana faktora pokazano je da se najbolji kvalitet granula postiže korišćenjem 35 % rastvora saharoze kao vezivnog sredstva.
PB  - Serbian Chemical Society, Belgrade
C3  - 56th Meeting of the Serbian chemical Society - Proceedings
T1  - Investigation of the dynamics of fluidized bed granulation process
T1  - Ispitivanje dinamike granulacije praškastih materijala u fluidizovanom sloju
EP  - 59
SP  - 55
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4190
ER  - 

@conference{
author = "Kaluđerović-Radoičić, Tatjana and Đuriš, Mihal and Jaćimovski, Darko and Arsenijević, Zorana",
year = "2019",
abstract = "In this paper, experimental investigation of the dynamics of the process of fluidized bed granulation was performed, in order to find optimal process conditions and binder concentration to achieve the desired granules development. The experiments were performed in batch system using corn flour as starting material. Ten experiments were performed in which sucrose solution of different concentrations (20, 30, 35 and 40 %) was used as binder. The temperature of the system was kept constant during the granulation process and amounted to 40-50°C. Samples were taken from the fluidized bed at time intervals of 3 min. The dynamics of granulation was examined by determining three different factors (bulk density, moisure content and particle size distribution) for each of the samples. It has been found that bulk density continuously decreases during the granulation process, while in the drying phase it remains constant. Particle size distribution has shown that the average diameter of the projected surface increases uniformly during the process. By comparing all of the three investigated factors, it was shown that the best quality of granules is achieved using 35 % sucrose solution ., U ovom radu izvršeno je eksperimentalno ispitivanje procesa mokre granulacije u fluidizovanom sloju u cilju pronalaženja optimalnih uslova izvođenja procesa i sastava veziva kojim će se ostvariti željena dinamika razvoja granula. Ispitivanje je izvršeno u šaržnom sistemu, a korišćeno je kukuruzno brašno kao polazni materijal. Izvršeno je 10 eksperimenata u kojima je kao vezivno sredstvo korišćen rastvor saharoze različitih koncentracija: 20, 30, 35 i 40 %. Temperatura je održavana konstantnom tokom procesa granulacije i iznosila je 40-50C. Uzorci su iz sloja uzimani u jednakim vremenskim intervalima od 3 min. Dinamika granulacije ispitivana je određivanjem tri različita faktora (nasipne gustina, vlažnosti i raspodele veličine čestica) za svaki od uzoraka. Utvrđeno je da nasipna gustina kontinualno opada tokom izvođenja procesa granulacije, dok u fazi sušenja ostaje konstantna. Raspodela veličina čestica je pokazala da srednji prečnik projektovane površine ravnomerno raste tokom procesa. Poređenjem sva tri ispitivana faktora pokazano je da se najbolji kvalitet granula postiže korišćenjem 35 % rastvora saharoze kao vezivnog sredstva.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "56th Meeting of the Serbian chemical Society - Proceedings",
title = "Investigation of the dynamics of fluidized bed granulation process, Ispitivanje dinamike granulacije praškastih materijala u fluidizovanom sloju",
pages = "59-55",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4190"
}

Kaluđerović-Radoičić, T., Đuriš, M., Jaćimovski, D.,& Arsenijević, Z.. (2019). Investigation of the dynamics of fluidized bed granulation process. in 56th Meeting of the Serbian chemical Society - Proceedings
Serbian Chemical Society, Belgrade., 55-59.
https://hdl.handle.net/21.15107/rcub_technorep_4190

Kaluđerović-Radoičić T, Đuriš M, Jaćimovski D, Arsenijević Z. Investigation of the dynamics of fluidized bed granulation process. in 56th Meeting of the Serbian chemical Society - Proceedings. 2019;:55-59.
https://hdl.handle.net/21.15107/rcub_technorep_4190 .

Kaluđerović-Radoičić, Tatjana, Đuriš, Mihal, Jaćimovski, Darko, Arsenijević, Zorana, "Investigation of the dynamics of fluidized bed granulation process" in 56th Meeting of the Serbian chemical Society - Proceedings (2019):55-59,
https://hdl.handle.net/21.15107/rcub_technorep_4190 .

TY  - CONF
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Đuriš, Mihal
AU  - Jaćimovski, Darko
AU  - Arsenijević, Zorana
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4188
AB  - In this paper, experimental investigation of the dynamics of the process of fluidized bed granulation was performed, in order to find optimal process conditions and binder concentration to achieve the desired granules development. The experiments were performed in batch system using corn flour as starting material. Ten experiments were performed in which sucrose solution of different concentrations (20, 30, 35 and 40 %) was used as binder. The temperature of the system was kept constant during the granulation process and amounted to 40-50°C. Samples were taken from the fluidized bed at time intervals of 3 min. The dynamics of granulation was examined by determining three different factors (bulk density, moisure content and particle size distribution) for each of the samples. It has been found that bulk density continuously decreases during the granulation process, while in the drying phase it remains constant. Particle size distribution has shown that the average diameter of the projected surface increases uniformly during the process. By comparing all of the three investigated factors, it was shown that the best quality of granules is achieved using 35 % sucrose solution .
AB  - U ovom radu izvršeno je eksperimentalno ispitivanje procesa mokre granulacije u fluidizovanom sloju u cilju pronalaženja optimalnih uslova izvođenja procesa i sastava veziva kojim će se ostvariti željena dinamika razvoja granula. Ispitivanje je izvršeno u šaržnom sistemu, a korišćeno je kukuruzno brašno kao polazni materijal. Izvršeno je 10 eksperimenata u kojima je kao vezivno sredstvo korišćen rastvor saharoze različitih koncentracija: 20, 30, 35 i 40 %. Temperatura je održavana konstantnom tokom procesa granulacije i iznosila je 40-50C. Uzorci su iz sloja uzimani u jednakim vremenskim intervalima od 3 min. Dinamika granulacije ispitivana je određivanjem tri različita faktora (nasipne gustina, vlažnosti i raspodele veličine čestica) za svaki od uzoraka. Utvrđeno je da nasipna gustina kontinualno opada tokom izvođenja procesa granulacije, dok u fazi sušenja ostaje konstantna. Raspodela veličina čestica je pokazala da srednji prečnik projektovane površine ravnomerno raste tokom procesa. Poređenjem sva tri ispitivana faktora pokazano je da se najbolji kvalitet granula postiže korišćenjem 35 % rastvora saharoze kao vezivnog sredstva.
PB  - Serbian Chemical Society, Belgrade
C3  - 56th Meeting of the Serbian chemical Society - Book of Abstracts
T1  - Investigation of the dynamics of fluidized bed granulation process
T1  - Ispitivanje dinamike granulacije praškastih materijala u fluidizovanom sloju
SP  - 36
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4188
ER  - 

@conference{
author = "Kaluđerović-Radoičić, Tatjana and Đuriš, Mihal and Jaćimovski, Darko and Arsenijević, Zorana",
year = "2019",
abstract = "In this paper, experimental investigation of the dynamics of the process of fluidized bed granulation was performed, in order to find optimal process conditions and binder concentration to achieve the desired granules development. The experiments were performed in batch system using corn flour as starting material. Ten experiments were performed in which sucrose solution of different concentrations (20, 30, 35 and 40 %) was used as binder. The temperature of the system was kept constant during the granulation process and amounted to 40-50°C. Samples were taken from the fluidized bed at time intervals of 3 min. The dynamics of granulation was examined by determining three different factors (bulk density, moisure content and particle size distribution) for each of the samples. It has been found that bulk density continuously decreases during the granulation process, while in the drying phase it remains constant. Particle size distribution has shown that the average diameter of the projected surface increases uniformly during the process. By comparing all of the three investigated factors, it was shown that the best quality of granules is achieved using 35 % sucrose solution ., U ovom radu izvršeno je eksperimentalno ispitivanje procesa mokre granulacije u fluidizovanom sloju u cilju pronalaženja optimalnih uslova izvođenja procesa i sastava veziva kojim će se ostvariti željena dinamika razvoja granula. Ispitivanje je izvršeno u šaržnom sistemu, a korišćeno je kukuruzno brašno kao polazni materijal. Izvršeno je 10 eksperimenata u kojima je kao vezivno sredstvo korišćen rastvor saharoze različitih koncentracija: 20, 30, 35 i 40 %. Temperatura je održavana konstantnom tokom procesa granulacije i iznosila je 40-50C. Uzorci su iz sloja uzimani u jednakim vremenskim intervalima od 3 min. Dinamika granulacije ispitivana je određivanjem tri različita faktora (nasipne gustina, vlažnosti i raspodele veličine čestica) za svaki od uzoraka. Utvrđeno je da nasipna gustina kontinualno opada tokom izvođenja procesa granulacije, dok u fazi sušenja ostaje konstantna. Raspodela veličina čestica je pokazala da srednji prečnik projektovane površine ravnomerno raste tokom procesa. Poređenjem sva tri ispitivana faktora pokazano je da se najbolji kvalitet granula postiže korišćenjem 35 % rastvora saharoze kao vezivnog sredstva.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "56th Meeting of the Serbian chemical Society - Book of Abstracts",
title = "Investigation of the dynamics of fluidized bed granulation process, Ispitivanje dinamike granulacije praškastih materijala u fluidizovanom sloju",
pages = "36",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4188"
}

Kaluđerović-Radoičić, T., Đuriš, M., Jaćimovski, D.,& Arsenijević, Z.. (2019). Investigation of the dynamics of fluidized bed granulation process. in 56th Meeting of the Serbian chemical Society - Book of Abstracts
Serbian Chemical Society, Belgrade., 36.
https://hdl.handle.net/21.15107/rcub_technorep_4188

Kaluđerović-Radoičić T, Đuriš M, Jaćimovski D, Arsenijević Z. Investigation of the dynamics of fluidized bed granulation process. in 56th Meeting of the Serbian chemical Society - Book of Abstracts. 2019;:36.
https://hdl.handle.net/21.15107/rcub_technorep_4188 .

Kaluđerović-Radoičić, Tatjana, Đuriš, Mihal, Jaćimovski, Darko, Arsenijević, Zorana, "Investigation of the dynamics of fluidized bed granulation process" in 56th Meeting of the Serbian chemical Society - Book of Abstracts (2019):36,
https://hdl.handle.net/21.15107/rcub_technorep_4188 .

TY  - JOUR
AU  - Lopičić, Zorica
AU  - Stojanović, Mirjana
AU  - Marković, Smilja
AU  - Milojković, Jelena V.
AU  - Mihajlović, Marija L.
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Kijevčanin, Mirjana
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4100
AB  - In this paper, the character of structural changes induced by different mechanical treatments to Prunus persica stones (PSs), and its subsequent effect on biosorption kinetics of Cu(II) were investigated. PSs were processed in vibratory disk mill (PS-V) and ultra-centrifugal mill (PS-C) and characterized by XRD, BET, SEM and FTIR spectroscopy. It was shown that PS-V was smaller and more reactive with less crystallinity index and hydrogen bond intensity compared to PS-C. In opposite, surface area of the PS-C was bigger than that of the PS-V. The total pore volume was about threefold, while the volume of micro pores was 9.29 times higher in PS-Cs than in PS-Vs. The kinetics of Cu(II) biosorption by both PSs was tested through various kinetic models: pseudo-first and pseudo-second order rate equations, Elovich equation, Boyd model, Weber-Morris and Urano-Tachikawa intraparticle diffusion model. For both sample types, Cu(II) biosorption occurred through combination of intraparticle and film diffusion mechanism, while kinetic results were best described by the pseudo-second order kinetic model. At the same time, the results indicated that together with kinetic rate the biosorption capacity of PS-C (21.20 mg g(-1)) was higher than that of PS-V (16.30 mg g(-1)). Mechanical activation like crushing and grinding will change material particle size, specific surface area and porosity, as well as its crystallinity. However, this paper elucidates that such physical structural changes will impact on heavy metal ions removal efficiency. This investigation suggests that the type of size reduction in lignocellulosic biosorbent preparation plays a very important role in overall biosorption performance, so it should be carefully considered every time when the mechanical treatment of material is necessary to be applied.
PB  - Elsevier, Amsterdam
T2  - Arabian Journal of Chemistry
T1  - Effects of different mechanical treatments on structural changes of lignocellulosic waste biomass and subsequent Cu(II) removal kinetics
EP  - 4103
IS  - 8
SP  - 4091
VL  - 12
DO  - 10.1016/j.arabjc.2016.04.005
ER  - 

@article{
author = "Lopičić, Zorica and Stojanović, Mirjana and Marković, Smilja and Milojković, Jelena V. and Mihajlović, Marija L. and Kaluđerović-Radoičić, Tatjana and Kijevčanin, Mirjana",
year = "2019",
abstract = "In this paper, the character of structural changes induced by different mechanical treatments to Prunus persica stones (PSs), and its subsequent effect on biosorption kinetics of Cu(II) were investigated. PSs were processed in vibratory disk mill (PS-V) and ultra-centrifugal mill (PS-C) and characterized by XRD, BET, SEM and FTIR spectroscopy. It was shown that PS-V was smaller and more reactive with less crystallinity index and hydrogen bond intensity compared to PS-C. In opposite, surface area of the PS-C was bigger than that of the PS-V. The total pore volume was about threefold, while the volume of micro pores was 9.29 times higher in PS-Cs than in PS-Vs. The kinetics of Cu(II) biosorption by both PSs was tested through various kinetic models: pseudo-first and pseudo-second order rate equations, Elovich equation, Boyd model, Weber-Morris and Urano-Tachikawa intraparticle diffusion model. For both sample types, Cu(II) biosorption occurred through combination of intraparticle and film diffusion mechanism, while kinetic results were best described by the pseudo-second order kinetic model. At the same time, the results indicated that together with kinetic rate the biosorption capacity of PS-C (21.20 mg g(-1)) was higher than that of PS-V (16.30 mg g(-1)). Mechanical activation like crushing and grinding will change material particle size, specific surface area and porosity, as well as its crystallinity. However, this paper elucidates that such physical structural changes will impact on heavy metal ions removal efficiency. This investigation suggests that the type of size reduction in lignocellulosic biosorbent preparation plays a very important role in overall biosorption performance, so it should be carefully considered every time when the mechanical treatment of material is necessary to be applied.",
publisher = "Elsevier, Amsterdam",
journal = "Arabian Journal of Chemistry",
title = "Effects of different mechanical treatments on structural changes of lignocellulosic waste biomass and subsequent Cu(II) removal kinetics",
pages = "4103-4091",
number = "8",
volume = "12",
doi = "10.1016/j.arabjc.2016.04.005"
}

Lopičić, Z., Stojanović, M., Marković, S., Milojković, J. V., Mihajlović, M. L., Kaluđerović-Radoičić, T.,& Kijevčanin, M.. (2019). Effects of different mechanical treatments on structural changes of lignocellulosic waste biomass and subsequent Cu(II) removal kinetics. in Arabian Journal of Chemistry
Elsevier, Amsterdam., 12(8), 4091-4103.
https://doi.org/10.1016/j.arabjc.2016.04.005

Lopičić Z, Stojanović M, Marković S, Milojković JV, Mihajlović ML, Kaluđerović-Radoičić T, Kijevčanin M. Effects of different mechanical treatments on structural changes of lignocellulosic waste biomass and subsequent Cu(II) removal kinetics. in Arabian Journal of Chemistry. 2019;12(8):4091-4103.
doi:10.1016/j.arabjc.2016.04.005 .

Lopičić, Zorica, Stojanović, Mirjana, Marković, Smilja, Milojković, Jelena V., Mihajlović, Marija L., Kaluđerović-Radoičić, Tatjana, Kijevčanin, Mirjana, "Effects of different mechanical treatments on structural changes of lignocellulosic waste biomass and subsequent Cu(II) removal kinetics" in Arabian Journal of Chemistry, 12, no. 8 (2019):4091-4103,
https://doi.org/10.1016/j.arabjc.2016.04.005 . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Jaćimovski, Darko
AU  - Arsenijević, Zorana
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4083
AB  - In this paper, an innovative fluidized bed dryer with inert particles is presented. The system can be used for drying of solutions, suspensions and pastes in order to obtain a powdered product. The experiments were performed in a pilot-scale dryer with a cylindrical column 0.215 m in diameter and 1.2 mm height, with glass spheres as inert particles. The material used for drying was CuSO4 solution. The effects of operating conditions on the dryer throughput and product quality were investigated. Main performance criteria, i.e. specific water evaporation rate, specific heat consumption and specific air consumption, were quantified. Nearly isothermal conditions were found due to thorough mixing of the particles. The energy efficiency of the dryer was also assessed. Simple heat and mass balances predicted the dryer performance quite well.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - High Efficiency Disperse Dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles
EP  - 222
IS  - 4
SP  - 213
VL  - 73
DO  - 10.2298/HEMIND190626021D
ER  - 

@article{
author = "Đuriš, Mihal and Kaluđerović-Radoičić, Tatjana and Jaćimovski, Darko and Arsenijević, Zorana",
year = "2019",
abstract = "In this paper, an innovative fluidized bed dryer with inert particles is presented. The system can be used for drying of solutions, suspensions and pastes in order to obtain a powdered product. The experiments were performed in a pilot-scale dryer with a cylindrical column 0.215 m in diameter and 1.2 mm height, with glass spheres as inert particles. The material used for drying was CuSO4 solution. The effects of operating conditions on the dryer throughput and product quality were investigated. Main performance criteria, i.e. specific water evaporation rate, specific heat consumption and specific air consumption, were quantified. Nearly isothermal conditions were found due to thorough mixing of the particles. The energy efficiency of the dryer was also assessed. Simple heat and mass balances predicted the dryer performance quite well.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "High Efficiency Disperse Dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles",
pages = "222-213",
number = "4",
volume = "73",
doi = "10.2298/HEMIND190626021D"
}

Đuriš, M., Kaluđerović-Radoičić, T., Jaćimovski, D.,& Arsenijević, Z.. (2019). High Efficiency Disperse Dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 73(4), 213-222.
https://doi.org/10.2298/HEMIND190626021D

Đuriš M, Kaluđerović-Radoičić T, Jaćimovski D, Arsenijević Z. High Efficiency Disperse Dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles. in Hemijska industrija. 2019;73(4):213-222.
doi:10.2298/HEMIND190626021D .

Đuriš, Mihal, Kaluđerović-Radoičić, Tatjana, Jaćimovski, Darko, Arsenijević, Zorana, "High Efficiency Disperse Dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles" in Hemijska industrija, 73, no. 4 (2019):213-222,
https://doi.org/10.2298/HEMIND190626021D . .

TY  - JOUR
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Bošković-Vragolović, Nevenka
AU  - Garić-Grulović, Radmila
AU  - Đuriš, Mihal
AU  - Grbavčić, Željko
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3713
AB  - The aim of this work was the experimental evaluation of different friction factor correlations for water flow through packed beds of spherical and non-spherical particles at ambient temperature. The experiments were performed by measuring the pressure drop across the bed. Packed beds made of monosized glass spherical particles of seven different diameters were used, as well as beds made of 16 fractions of quartz filtration sand obtained by sieving (polydisperse non-spherical particles). The range of bed voidages was 0.359-0.486, while the range of bed particle Reynolds numbers was from 0.3 to 286 for spherical particles and from 0.1 to 50 for non-spherical particles. The obtained results were compared using a number of available literature correlations. In order to improve the correlation results for spherical particles, a new simple equation was proposed in the form of Ergun's equation, with modified coefficients. The new correlation had a mean absolute deviation between experimental and calculated values of pressure drop of 9.04%. For non-spherical quartz filtration sand particles the best fit was obtained using Ergun's equation, with a mean absolute deviation of 10.36%. Surface-volume diameter (dsv) necessary for correlating the data for filtration sand particles was calculated based on correlations for d(v) = f(d(m)) and psi = f(d(m)).
PB  - Savez hemijskih inženjera, Beograd
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - Friction factor for water flow through packed beds of spherical and non-spherical particles
EP  - 66
IS  - 1
SP  - 57
VL  - 23
DO  - 10.2298/CICEQ150506006K
ER  - 

@article{
author = "Kaluđerović-Radoičić, Tatjana and Bošković-Vragolović, Nevenka and Garić-Grulović, Radmila and Đuriš, Mihal and Grbavčić, Željko",
year = "2017",
abstract = "The aim of this work was the experimental evaluation of different friction factor correlations for water flow through packed beds of spherical and non-spherical particles at ambient temperature. The experiments were performed by measuring the pressure drop across the bed. Packed beds made of monosized glass spherical particles of seven different diameters were used, as well as beds made of 16 fractions of quartz filtration sand obtained by sieving (polydisperse non-spherical particles). The range of bed voidages was 0.359-0.486, while the range of bed particle Reynolds numbers was from 0.3 to 286 for spherical particles and from 0.1 to 50 for non-spherical particles. The obtained results were compared using a number of available literature correlations. In order to improve the correlation results for spherical particles, a new simple equation was proposed in the form of Ergun's equation, with modified coefficients. The new correlation had a mean absolute deviation between experimental and calculated values of pressure drop of 9.04%. For non-spherical quartz filtration sand particles the best fit was obtained using Ergun's equation, with a mean absolute deviation of 10.36%. Surface-volume diameter (dsv) necessary for correlating the data for filtration sand particles was calculated based on correlations for d(v) = f(d(m)) and psi = f(d(m)).",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "Friction factor for water flow through packed beds of spherical and non-spherical particles",
pages = "66-57",
number = "1",
volume = "23",
doi = "10.2298/CICEQ150506006K"
}

Kaluđerović-Radoičić, T., Bošković-Vragolović, N., Garić-Grulović, R., Đuriš, M.,& Grbavčić, Ž.. (2017). Friction factor for water flow through packed beds of spherical and non-spherical particles. in Chemical Industry & Chemical Engineering Quarterly
Savez hemijskih inženjera, Beograd., 23(1), 57-66.
https://doi.org/10.2298/CICEQ150506006K

Kaluđerović-Radoičić T, Bošković-Vragolović N, Garić-Grulović R, Đuriš M, Grbavčić Ž. Friction factor for water flow through packed beds of spherical and non-spherical particles. in Chemical Industry & Chemical Engineering Quarterly. 2017;23(1):57-66.
doi:10.2298/CICEQ150506006K .

Kaluđerović-Radoičić, Tatjana, Bošković-Vragolović, Nevenka, Garić-Grulović, Radmila, Đuriš, Mihal, Grbavčić, Željko, "Friction factor for water flow through packed beds of spherical and non-spherical particles" in Chemical Industry & Chemical Engineering Quarterly, 23, no. 1 (2017):57-66,
https://doi.org/10.2298/CICEQ150506006K . .

TY  - JOUR
AU  - Cvetković, Slobodan
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Kijevčanin, Mirjana
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3756
AB  - The aim of this study is to analyze the possibility of achieving the goal related to share of biogas energy in the final energy consumption in Republic of Serbia up to 2030 which refers to reach of 2% of electricity produced from biogas, 1% of the final energy consumption in transport produced from biogas, and 1% of the final heat energy consumption from biogas in accordance with the recommendations of the European Biomass Association (AEBIOM). The analysis was performed on the basis of estimated biogas potential, where biogas was produced from energy crops dedicated to energy production, animal husbandry, municipal solid waste, waste from the meat industry and dairy industry wastewater as well as Serbian energy development strategy until 2030.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Energy Sources Part B-Economics Planning and Policy
T1  - Perspective of using biogas in Serbia in European context
EP  - 376
IS  - 4
SP  - 372
VL  - 12
DO  - 10.1080/15567249.2015.1136973
ER  - 

@article{
author = "Cvetković, Slobodan and Kaluđerović-Radoičić, Tatjana and Kijevčanin, Mirjana",
year = "2017",
abstract = "The aim of this study is to analyze the possibility of achieving the goal related to share of biogas energy in the final energy consumption in Republic of Serbia up to 2030 which refers to reach of 2% of electricity produced from biogas, 1% of the final energy consumption in transport produced from biogas, and 1% of the final heat energy consumption from biogas in accordance with the recommendations of the European Biomass Association (AEBIOM). The analysis was performed on the basis of estimated biogas potential, where biogas was produced from energy crops dedicated to energy production, animal husbandry, municipal solid waste, waste from the meat industry and dairy industry wastewater as well as Serbian energy development strategy until 2030.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Energy Sources Part B-Economics Planning and Policy",
title = "Perspective of using biogas in Serbia in European context",
pages = "376-372",
number = "4",
volume = "12",
doi = "10.1080/15567249.2015.1136973"
}

Cvetković, S., Kaluđerović-Radoičić, T.,& Kijevčanin, M.. (2017). Perspective of using biogas in Serbia in European context. in Energy Sources Part B-Economics Planning and Policy
Taylor & Francis Inc, Philadelphia., 12(4), 372-376.
https://doi.org/10.1080/15567249.2015.1136973

Cvetković S, Kaluđerović-Radoičić T, Kijevčanin M. Perspective of using biogas in Serbia in European context. in Energy Sources Part B-Economics Planning and Policy. 2017;12(4):372-376.
doi:10.1080/15567249.2015.1136973 .

Cvetković, Slobodan, Kaluđerović-Radoičić, Tatjana, Kijevčanin, Mirjana, "Perspective of using biogas in Serbia in European context" in Energy Sources Part B-Economics Planning and Policy, 12, no. 4 (2017):372-376,
https://doi.org/10.1080/15567249.2015.1136973 . .

TY  - JOUR
AU  - Lopičić, Zorica
AU  - Stojanović, Mirjana D.
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Milojković, Jelena V.
AU  - Petrović, Marija S.
AU  - Mihajlović, Marija L.
AU  - Kijevčanin, Mirjana
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3721
AB  - This paper presents an eco-friendly approach for minimizing heavy metal pollution, offering food waste valorization and energy source at the same time. It focuses on Cu(II) sorption by low cost sorbent developed by mechanical treatment of Prunus persica L. stones, a food industry waste biomass. Removal of Cu(II) was studied at different operating parameters in a batch sorption system, with special attention on temperature effect on sorption process. The pseudo-first order, pseudo-second order and Elovich model were applied to test kinetic experimental data. Equilibrium experimental results were fitted to Langmuir, Freundlich, Sips, Toth and Dubinin-Radushkevich isotherms to elucidate the type and sorption performance. Characteristic functional groups responsible for Cu(II) binding and thermal behavior of PS have been investigated using FT-IR and TGA analyses. The activation parameters were calculated using Arrhenius and Eyring equations. Using equilibrium data at different temperatures, thermodynamic parameters Delta G degrees, Delta H degrees and Delta S degrees were calculated, suggesting that the sorption of Cu(II) on PS is spontaneous and endothermic process with increased randomness during the sorption. The isosteric heat of adsorption (Delta H-iso) was determined, suggesting the non -uniformity of PS surface and lateral interactions among ions sorbed. Desorption experiments performed with different chemicals have confirmed the reusability of PS for five cycles, without losing and even improving its sorption capacity. Results presented in this paper might help in appropriate design of purification systems using this type of lignocellulosic waste.
PB  - Elsevier Sci Ltd, Oxford
T2  - Journal of Cleaner Production
T1  - Optimization of the process of Cu(II) sorption by mechanically treated Prunus persica L. - Contribution to sustainability in food processing industry
EP  - 105
SP  - 95
VL  - 156
DO  - 10.1016/j.jclepro.2017.04.041
ER  - 

@article{
author = "Lopičić, Zorica and Stojanović, Mirjana D. and Kaluđerović-Radoičić, Tatjana and Milojković, Jelena V. and Petrović, Marija S. and Mihajlović, Marija L. and Kijevčanin, Mirjana",
year = "2017",
abstract = "This paper presents an eco-friendly approach for minimizing heavy metal pollution, offering food waste valorization and energy source at the same time. It focuses on Cu(II) sorption by low cost sorbent developed by mechanical treatment of Prunus persica L. stones, a food industry waste biomass. Removal of Cu(II) was studied at different operating parameters in a batch sorption system, with special attention on temperature effect on sorption process. The pseudo-first order, pseudo-second order and Elovich model were applied to test kinetic experimental data. Equilibrium experimental results were fitted to Langmuir, Freundlich, Sips, Toth and Dubinin-Radushkevich isotherms to elucidate the type and sorption performance. Characteristic functional groups responsible for Cu(II) binding and thermal behavior of PS have been investigated using FT-IR and TGA analyses. The activation parameters were calculated using Arrhenius and Eyring equations. Using equilibrium data at different temperatures, thermodynamic parameters Delta G degrees, Delta H degrees and Delta S degrees were calculated, suggesting that the sorption of Cu(II) on PS is spontaneous and endothermic process with increased randomness during the sorption. The isosteric heat of adsorption (Delta H-iso) was determined, suggesting the non -uniformity of PS surface and lateral interactions among ions sorbed. Desorption experiments performed with different chemicals have confirmed the reusability of PS for five cycles, without losing and even improving its sorption capacity. Results presented in this paper might help in appropriate design of purification systems using this type of lignocellulosic waste.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Journal of Cleaner Production",
title = "Optimization of the process of Cu(II) sorption by mechanically treated Prunus persica L. - Contribution to sustainability in food processing industry",
pages = "105-95",
volume = "156",
doi = "10.1016/j.jclepro.2017.04.041"
}

Lopičić, Z., Stojanović, M. D., Kaluđerović-Radoičić, T., Milojković, J. V., Petrović, M. S., Mihajlović, M. L.,& Kijevčanin, M.. (2017). Optimization of the process of Cu(II) sorption by mechanically treated Prunus persica L. - Contribution to sustainability in food processing industry. in Journal of Cleaner Production
Elsevier Sci Ltd, Oxford., 156, 95-105.
https://doi.org/10.1016/j.jclepro.2017.04.041

Lopičić Z, Stojanović MD, Kaluđerović-Radoičić T, Milojković JV, Petrović MS, Mihajlović ML, Kijevčanin M. Optimization of the process of Cu(II) sorption by mechanically treated Prunus persica L. - Contribution to sustainability in food processing industry. in Journal of Cleaner Production. 2017;156:95-105.
doi:10.1016/j.jclepro.2017.04.041 .

Lopičić, Zorica, Stojanović, Mirjana D., Kaluđerović-Radoičić, Tatjana, Milojković, Jelena V., Petrović, Marija S., Mihajlović, Marija L., Kijevčanin, Mirjana, "Optimization of the process of Cu(II) sorption by mechanically treated Prunus persica L. - Contribution to sustainability in food processing industry" in Journal of Cleaner Production, 156 (2017):95-105,
https://doi.org/10.1016/j.jclepro.2017.04.041 . .

TY  - JOUR
AU  - Cvetković, Slobodan
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Vukadinović, Bojana
AU  - Kijevčanin, Mirjana
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3349
AB  - The aim of this paper was to present the energy flows in the life cycle of biogas utilization systems (cogeneration and transportation), as well as their mutual relations, starting from providing the feedstock for digestion through to end-of-life management of biogas system as fertilizer on agricultural land. This study was carried out through the energy analysis of two scenarios (biogas in cogeneration and biogas in transportation) using performance of Mirotin biogas plant (1 MW) in Serbia. Results obtained in this study have shown that the analyzed scenario (biogas in cogeneration and biogas in transportation) have positive energy balances (52,114 and 53,585 GJ) and these scenarios are sustainable from energetic point of view.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Energy Sources Part A-Recovery Utilization and Environmental Effects
T1  - A life cycle energy assessment for biogas energy in Serbia
EP  - 3102
IS  - 20
SP  - 3095
VL  - 38
DO  - 10.1080/15567036.2015.1135207
ER  - 

@article{
author = "Cvetković, Slobodan and Kaluđerović-Radoičić, Tatjana and Vukadinović, Bojana and Kijevčanin, Mirjana",
year = "2016",
abstract = "The aim of this paper was to present the energy flows in the life cycle of biogas utilization systems (cogeneration and transportation), as well as their mutual relations, starting from providing the feedstock for digestion through to end-of-life management of biogas system as fertilizer on agricultural land. This study was carried out through the energy analysis of two scenarios (biogas in cogeneration and biogas in transportation) using performance of Mirotin biogas plant (1 MW) in Serbia. Results obtained in this study have shown that the analyzed scenario (biogas in cogeneration and biogas in transportation) have positive energy balances (52,114 and 53,585 GJ) and these scenarios are sustainable from energetic point of view.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Energy Sources Part A-Recovery Utilization and Environmental Effects",
title = "A life cycle energy assessment for biogas energy in Serbia",
pages = "3102-3095",
number = "20",
volume = "38",
doi = "10.1080/15567036.2015.1135207"
}

Cvetković, S., Kaluđerović-Radoičić, T., Vukadinović, B.,& Kijevčanin, M.. (2016). A life cycle energy assessment for biogas energy in Serbia. in Energy Sources Part A-Recovery Utilization and Environmental Effects
Taylor & Francis Inc, Philadelphia., 38(20), 3095-3102.
https://doi.org/10.1080/15567036.2015.1135207

Cvetković S, Kaluđerović-Radoičić T, Vukadinović B, Kijevčanin M. A life cycle energy assessment for biogas energy in Serbia. in Energy Sources Part A-Recovery Utilization and Environmental Effects. 2016;38(20):3095-3102.
doi:10.1080/15567036.2015.1135207 .

Cvetković, Slobodan, Kaluđerović-Radoičić, Tatjana, Vukadinović, Bojana, Kijevčanin, Mirjana, "A life cycle energy assessment for biogas energy in Serbia" in Energy Sources Part A-Recovery Utilization and Environmental Effects, 38, no. 20 (2016):3095-3102,
https://doi.org/10.1080/15567036.2015.1135207 . .

TY  - JOUR
AU  - Cvetković, Slobodan
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Kragić, Rastislav
AU  - Kijevčanin, Mirjana
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3343
AB  - Biogas represents a promising source for the production of clean energy. The objective of this paper was to quantij5; the potential for the reduction of emissions to the environment during the production of electricity from biogas in comparison with environmental effects of the production of the same amount of electricity from fossil resources (coal from Kolubara basin and natural gas). Basis for comparison of environmental impacts in this work was the annual production of electricity in biogas plants of the total capacity of 80 MW This study has shown that the annual production of electricity from biogas power plants of 80 MW results in: substitution of up to 840 kt of coal from Kolubara basin and 123.2 million m(3) of natural gas; reduction of greenhouse gases emissions in the range of 491.16 kt to 604.97 kt CO2eq, depending on the energy efficiency of the process of electricity production from biogas; reduction of greenhouse gases emissions up to 92.37 kt CO2eq compared to the use of natural gas for electricity generation.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Electricity production from biogas in Serbia assessment of emissions reduction
EP  - 1344
IS  - 4
SP  - 1333
VL  - 20
DO  - 10.2298/TSCI150812189C
ER  - 

@article{
author = "Cvetković, Slobodan and Kaluđerović-Radoičić, Tatjana and Kragić, Rastislav and Kijevčanin, Mirjana",
year = "2016",
abstract = "Biogas represents a promising source for the production of clean energy. The objective of this paper was to quantij5; the potential for the reduction of emissions to the environment during the production of electricity from biogas in comparison with environmental effects of the production of the same amount of electricity from fossil resources (coal from Kolubara basin and natural gas). Basis for comparison of environmental impacts in this work was the annual production of electricity in biogas plants of the total capacity of 80 MW This study has shown that the annual production of electricity from biogas power plants of 80 MW results in: substitution of up to 840 kt of coal from Kolubara basin and 123.2 million m(3) of natural gas; reduction of greenhouse gases emissions in the range of 491.16 kt to 604.97 kt CO2eq, depending on the energy efficiency of the process of electricity production from biogas; reduction of greenhouse gases emissions up to 92.37 kt CO2eq compared to the use of natural gas for electricity generation.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Electricity production from biogas in Serbia assessment of emissions reduction",
pages = "1344-1333",
number = "4",
volume = "20",
doi = "10.2298/TSCI150812189C"
}

Cvetković, S., Kaluđerović-Radoičić, T., Kragić, R.,& Kijevčanin, M.. (2016). Electricity production from biogas in Serbia assessment of emissions reduction. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 20(4), 1333-1344.
https://doi.org/10.2298/TSCI150812189C

Cvetković S, Kaluđerović-Radoičić T, Kragić R, Kijevčanin M. Electricity production from biogas in Serbia assessment of emissions reduction. in Thermal Science. 2016;20(4):1333-1344.
doi:10.2298/TSCI150812189C .

Cvetković, Slobodan, Kaluđerović-Radoičić, Tatjana, Kragić, Rastislav, Kijevčanin, Mirjana, "Electricity production from biogas in Serbia assessment of emissions reduction" in Thermal Science, 20, no. 4 (2016):1333-1344,
https://doi.org/10.2298/TSCI150812189C . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Arsenijević, Zorana
AU  - Garić-Grulović, Radmila
AU  - Grbavčić, Željko
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3389
AB  - In this paper, the minimum fluidization velocity and bed expansion of polydisperse sand mixtures fluidized with water were investigated. The fluidization experiments were carried out using 19 different fractions of quartz filtration sand with sieve diameters in the interval d(m) = 0.359 to 2.596 mm. The intercept fluid velocity U-E was determined from the plot of fluid superficial velocity vs. porosity. The results obtained indicated that U-E was about 11% higher than particle terminal velocity U-t, for all of the sand fractions investigated. Based on the experimental data, the new model for bed expansion of quartz filtration sand was proposed. Using the proposed model, the mean absolute deviation in predicting the bed porosity epsilon, for a given superficial velocity U, was 2.66%, while the mean absolute deviation in predicting U at a given epsilon was 8.75%. For the prediction of the minimum fluidization velocity, U-mf, several literature models were tested. The best results were obtained using the Ergun model, with mean absolute deviation in predicting U-mf of 12.42%. A new simple correlation for the prediction of the minimum fluidization velocity U-mf was proposed. The proposed correlation is the function only of the mean sieve diameter of the filtration sand fraction. The mean absolute deviation between the experimental and the predicted values of U-mf was 7.65%.
PB  - Elsevier Science Bv, Amsterdam
T2  - Powder Technology
T1  - Prediction of bed expansion of polydisperse quartz sand mixtures fluidized with water
EP  - 103
SP  - 95
VL  - 289
DO  - 10.1016/j.powtec.2015.11.047
ER  - 

@article{
author = "Đuriš, Mihal and Kaluđerović-Radoičić, Tatjana and Arsenijević, Zorana and Garić-Grulović, Radmila and Grbavčić, Željko",
year = "2016",
abstract = "In this paper, the minimum fluidization velocity and bed expansion of polydisperse sand mixtures fluidized with water were investigated. The fluidization experiments were carried out using 19 different fractions of quartz filtration sand with sieve diameters in the interval d(m) = 0.359 to 2.596 mm. The intercept fluid velocity U-E was determined from the plot of fluid superficial velocity vs. porosity. The results obtained indicated that U-E was about 11% higher than particle terminal velocity U-t, for all of the sand fractions investigated. Based on the experimental data, the new model for bed expansion of quartz filtration sand was proposed. Using the proposed model, the mean absolute deviation in predicting the bed porosity epsilon, for a given superficial velocity U, was 2.66%, while the mean absolute deviation in predicting U at a given epsilon was 8.75%. For the prediction of the minimum fluidization velocity, U-mf, several literature models were tested. The best results were obtained using the Ergun model, with mean absolute deviation in predicting U-mf of 12.42%. A new simple correlation for the prediction of the minimum fluidization velocity U-mf was proposed. The proposed correlation is the function only of the mean sieve diameter of the filtration sand fraction. The mean absolute deviation between the experimental and the predicted values of U-mf was 7.65%.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Powder Technology",
title = "Prediction of bed expansion of polydisperse quartz sand mixtures fluidized with water",
pages = "103-95",
volume = "289",
doi = "10.1016/j.powtec.2015.11.047"
}

Đuriš, M., Kaluđerović-Radoičić, T., Arsenijević, Z., Garić-Grulović, R.,& Grbavčić, Ž.. (2016). Prediction of bed expansion of polydisperse quartz sand mixtures fluidized with water. in Powder Technology
Elsevier Science Bv, Amsterdam., 289, 95-103.
https://doi.org/10.1016/j.powtec.2015.11.047

Đuriš M, Kaluđerović-Radoičić T, Arsenijević Z, Garić-Grulović R, Grbavčić Ž. Prediction of bed expansion of polydisperse quartz sand mixtures fluidized with water. in Powder Technology. 2016;289:95-103.
doi:10.1016/j.powtec.2015.11.047 .

Đuriš, Mihal, Kaluđerović-Radoičić, Tatjana, Arsenijević, Zorana, Garić-Grulović, Radmila, Grbavčić, Željko, "Prediction of bed expansion of polydisperse quartz sand mixtures fluidized with water" in Powder Technology, 289 (2016):95-103,
https://doi.org/10.1016/j.powtec.2015.11.047 . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Jaćimovski, Darko
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3306
AB  - In this paper, the influence of different scanning resolutions and the use of image analysis softwares for the image analysis, SigmaScan Pro, Image) and Matlab, on size and shape factors commonly used in particles characterization were investigated. In our previous paper [1] the characterization of polydisperse sand particles was performed, and the need had arisen to examine the impact of different scanning resolutions on shape factors in more detail. The particles analyzed were the polydisperse fractions of quartz filtration sand with sieve diameters in the intervals of 0.85-1.030 mm, 1.406-1.600 mm and 2.00-2.83 mm. The particles size and shape were analyzed using the scanned image of about 150 particles in each fraction. In addition, the images of circles of similar dimensions were generated to serve as reference particles. The scanning resolutions used in this study were from 75 to 4800 dpi, and grayscale thresholds were optimized for discrimination of the particles from the background. The obtained results indicate that the resolution (i.e. the pixel size) and the algorithms used in image analysis softwares have significant influence on the obtained shape factors. The most significant effect was observed in the calculated values of the particles perimeters, while the effect was less pronounced in the results obtained for the particles projected area. The analysis of images of generated circles confirmed that the resolution had the largest effect on particle perimeter. The use of the resolutions of 300-600 dpi for the determination of particle shape and size can be recommended for particles of similar to 1 mm and larger, because of reasonable results, low storage space and less time for image analysis.
PB  - Elsevier, Amsterdam
T2  - Powder Technology
T1  - Optimal pixel resolution for sand particles size and shape analysis
EP  - 186
SP  - 177
VL  - 302
DO  - 10.1016/j.powtec.2016.08.045
ER  - 

@article{
author = "Đuriš, Mihal and Arsenijević, Zorana and Jaćimovski, Darko and Kaluđerović-Radoičić, Tatjana",
year = "2016",
abstract = "In this paper, the influence of different scanning resolutions and the use of image analysis softwares for the image analysis, SigmaScan Pro, Image) and Matlab, on size and shape factors commonly used in particles characterization were investigated. In our previous paper [1] the characterization of polydisperse sand particles was performed, and the need had arisen to examine the impact of different scanning resolutions on shape factors in more detail. The particles analyzed were the polydisperse fractions of quartz filtration sand with sieve diameters in the intervals of 0.85-1.030 mm, 1.406-1.600 mm and 2.00-2.83 mm. The particles size and shape were analyzed using the scanned image of about 150 particles in each fraction. In addition, the images of circles of similar dimensions were generated to serve as reference particles. The scanning resolutions used in this study were from 75 to 4800 dpi, and grayscale thresholds were optimized for discrimination of the particles from the background. The obtained results indicate that the resolution (i.e. the pixel size) and the algorithms used in image analysis softwares have significant influence on the obtained shape factors. The most significant effect was observed in the calculated values of the particles perimeters, while the effect was less pronounced in the results obtained for the particles projected area. The analysis of images of generated circles confirmed that the resolution had the largest effect on particle perimeter. The use of the resolutions of 300-600 dpi for the determination of particle shape and size can be recommended for particles of similar to 1 mm and larger, because of reasonable results, low storage space and less time for image analysis.",
publisher = "Elsevier, Amsterdam",
journal = "Powder Technology",
title = "Optimal pixel resolution for sand particles size and shape analysis",
pages = "186-177",
volume = "302",
doi = "10.1016/j.powtec.2016.08.045"
}

Đuriš, M., Arsenijević, Z., Jaćimovski, D.,& Kaluđerović-Radoičić, T.. (2016). Optimal pixel resolution for sand particles size and shape analysis. in Powder Technology
Elsevier, Amsterdam., 302, 177-186.
https://doi.org/10.1016/j.powtec.2016.08.045

Đuriš M, Arsenijević Z, Jaćimovski D, Kaluđerović-Radoičić T. Optimal pixel resolution for sand particles size and shape analysis. in Powder Technology. 2016;302:177-186.
doi:10.1016/j.powtec.2016.08.045 .

Đuriš, Mihal, Arsenijević, Zorana, Jaćimovski, Darko, Kaluđerović-Radoičić, Tatjana, "Optimal pixel resolution for sand particles size and shape analysis" in Powder Technology, 302 (2016):177-186,
https://doi.org/10.1016/j.powtec.2016.08.045 . .

TY  - JOUR
AU  - Pešić, Radojica
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Bošković-Vragolović, Nevenka
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2926
AB  - The aim of this work was the experimental investigation of the particle friction factor for air flow through a packed bed of particles at ambient and elevated temperatures. The experiments were performed by measuring the pressure drop across the packed bed, heated to the desired temperature by hot air. Glass spherical particles of seven different diameters were used. The temperature range of the air flowing through the packed bed was from 20 to 350°C and the bed voidages were from 0.3574 to 0.4303. The obtained results were correlated using a number of available literature correlations. The overall best fit of all of the experimental data was obtained using the Ergun equation, with mean absolute deviation of 10.90%. Ergun's equation gave somewhat better results in correlating the data at ambient temperature with mean absolute deviation of 9.77%, while correlation of the data at elevated temperatures gave mean absolute deviation of 12.38%. The vast majority of the correlations used gave better results when applied to ambient temperature data than to the data at elevated temperatures. Based on the results obtained, the Ergun equation is proposed for friction factor calculation both at ambient and at elevated temperatures.
AB  - Cilj ovog rada je bio eksperimentalno ispitivanje koeficijenta trenja fluid-čestice prilikom strujanja vazduha kroz pakovani sloj čestica, na sobnoj i povišenim temperaturama. Izvršeno je eksperimentalno merenje pada pritiska u pakovanim slojevima različitih temperatura zagrejanih korišćenjem vrelog vazduha. Kao materijal za pakovanje korišćene su sferične staklene kuglice 7 različitih prečnika. Temperaturni interval u kom su vršeni eksperimenti bio je od 20 do 350°C, dok su poroznosti sloja iznosile od 0,3574 do 0,4303. Dobijeni rezultati korelisani su korišćenjem većeg broja literaturnih korelacija. Najbolje slaganje sa eksperimentalnim podacima pokazala je Ergunova jednačina [1], sa srednjim procentnim odstupanjem od 10,90%. Ergunova jednačina je dala bolje rezultate prilikom korelisanja podataka na sobnoj temperaturi (srednja procentna greška 9,77%), dok je korelisanje podataka na povišenim temperaturama izvršeno sa greškom od 12,38%. Većina testiranih literaturnih korelacija je dala bolje rezultate pri korelisanju podataka dobijenih na sobnoj temperaturi u odnosu na podatke dobijene na povišenim temperaturama. Na osnovu dobijenih rezultata, predlaže se korišćenje Ergunove jednačine za izračunavanje koeficijenta trenja fluid-čestice kako na sobnoj, tako i na povišenim temperaturama.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - Pressure drop in packed beds of spherical particles at ambient and elevated air temperatures
T1  - Pad pritiska u pakovanom sloju sferičnih čestica na sobnoj i povišenim temperaturama
EP  - 427
IS  - 3
SP  - 419
VL  - 21
DO  - 10.2298/CICEQ140618044P
ER  - 

@article{
author = "Pešić, Radojica and Kaluđerović-Radoičić, Tatjana and Bošković-Vragolović, Nevenka and Arsenijević, Zorana and Grbavčić, Željko",
year = "2015",
abstract = "The aim of this work was the experimental investigation of the particle friction factor for air flow through a packed bed of particles at ambient and elevated temperatures. The experiments were performed by measuring the pressure drop across the packed bed, heated to the desired temperature by hot air. Glass spherical particles of seven different diameters were used. The temperature range of the air flowing through the packed bed was from 20 to 350°C and the bed voidages were from 0.3574 to 0.4303. The obtained results were correlated using a number of available literature correlations. The overall best fit of all of the experimental data was obtained using the Ergun equation, with mean absolute deviation of 10.90%. Ergun's equation gave somewhat better results in correlating the data at ambient temperature with mean absolute deviation of 9.77%, while correlation of the data at elevated temperatures gave mean absolute deviation of 12.38%. The vast majority of the correlations used gave better results when applied to ambient temperature data than to the data at elevated temperatures. Based on the results obtained, the Ergun equation is proposed for friction factor calculation both at ambient and at elevated temperatures., Cilj ovog rada je bio eksperimentalno ispitivanje koeficijenta trenja fluid-čestice prilikom strujanja vazduha kroz pakovani sloj čestica, na sobnoj i povišenim temperaturama. Izvršeno je eksperimentalno merenje pada pritiska u pakovanim slojevima različitih temperatura zagrejanih korišćenjem vrelog vazduha. Kao materijal za pakovanje korišćene su sferične staklene kuglice 7 različitih prečnika. Temperaturni interval u kom su vršeni eksperimenti bio je od 20 do 350°C, dok su poroznosti sloja iznosile od 0,3574 do 0,4303. Dobijeni rezultati korelisani su korišćenjem većeg broja literaturnih korelacija. Najbolje slaganje sa eksperimentalnim podacima pokazala je Ergunova jednačina [1], sa srednjim procentnim odstupanjem od 10,90%. Ergunova jednačina je dala bolje rezultate prilikom korelisanja podataka na sobnoj temperaturi (srednja procentna greška 9,77%), dok je korelisanje podataka na povišenim temperaturama izvršeno sa greškom od 12,38%. Većina testiranih literaturnih korelacija je dala bolje rezultate pri korelisanju podataka dobijenih na sobnoj temperaturi u odnosu na podatke dobijene na povišenim temperaturama. Na osnovu dobijenih rezultata, predlaže se korišćenje Ergunove jednačine za izračunavanje koeficijenta trenja fluid-čestice kako na sobnoj, tako i na povišenim temperaturama.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "Pressure drop in packed beds of spherical particles at ambient and elevated air temperatures, Pad pritiska u pakovanom sloju sferičnih čestica na sobnoj i povišenim temperaturama",
pages = "427-419",
number = "3",
volume = "21",
doi = "10.2298/CICEQ140618044P"
}

Pešić, R., Kaluđerović-Radoičić, T., Bošković-Vragolović, N., Arsenijević, Z.,& Grbavčić, Ž.. (2015). Pressure drop in packed beds of spherical particles at ambient and elevated air temperatures. in Chemical Industry & Chemical Engineering Quarterly
Association of the Chemical Engineers of Serbia., 21(3), 419-427.
https://doi.org/10.2298/CICEQ140618044P

Pešić R, Kaluđerović-Radoičić T, Bošković-Vragolović N, Arsenijević Z, Grbavčić Ž. Pressure drop in packed beds of spherical particles at ambient and elevated air temperatures. in Chemical Industry & Chemical Engineering Quarterly. 2015;21(3):419-427.
doi:10.2298/CICEQ140618044P .

Pešić, Radojica, Kaluđerović-Radoičić, Tatjana, Bošković-Vragolović, Nevenka, Arsenijević, Zorana, Grbavčić, Željko, "Pressure drop in packed beds of spherical particles at ambient and elevated air temperatures" in Chemical Industry & Chemical Engineering Quarterly, 21, no. 3 (2015):419-427,
https://doi.org/10.2298/CICEQ140618044P . .

TY  - JOUR
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Radović, Ivona
AU  - Ivanović, Marija
AU  - Rajić, Nevenka
AU  - Grbavčić, Željko
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2896
AB  - In this paper the process of the copper (II) sulphate monohydrate from copper (II) sulphate pentahydrate (also known as a Blue vitriol or Bluestone) production was analyzed. Copper (II) sulphate pentahydrate is one of the most important copper salts which has been known since the ancient Egyptians. In the nineteenth century its application as a fungicide was discovered which provoked wide industrial production. Molecule of the copper (II) sulphate pentahydrate is a crystalohydrate with five water molecules linked by chemical bonds to a molecule of the copper (II) sulphate. Copper (II) sulphate exists as a series of compounds that differ in their degree of hydratation. The anhydrous form is a pale green or gray-white powder, whereas the pentahydrate (CuSO4∙5H2O), the most commonly encountered salt, is bright blue. In order to obtain copper (II) sulphate monohydrate from copper (II) sulphate pentahydrate, it is necessary to remove four water molecules. To determine the optimum temperature and time required for the removal of four water molecules from a molecule of pentahydrate in this work thermogravimetric (TGA) analysis was performed. Thermogravimetric (TGA) analysis - dehydration of copper (II) sulphate pentahydrate is done using simultaneous TG-DSC thermal analyzer DTG-Q600 SDT from TA Instruments. Analysis was carried out for two types of samples, the samples containing particles of the average diameter equal to 0.17 mm and the particles of the average diameter 0.5 mm. In addition, fluidization and drying curve were determined using a semiindustrial fluidization column. On the top, the industrial fluidization column, aimed to produce 300 tonnes per month of copper (II) sulphate monohydrate, was designed. Material and energy calculations were performed using software packages Simprosys 3.0 and SuperPro Designer 5.1. Simprosys 3.0 is a software package designed for the modeling and simulation of a drying process, as well as for 20 different unit operations. SuperPro Designer 5.1 facilitates modeling, evaluation and optimization of different industrial processes including drying. These software packages were applied for the calculation of the air flow rate, heat exchange and for the scoping of a dryer.
AB  - U ovom radu analiziran je proces dobijanja bakar(II)-sulfat-monohidrata iz bakar(II)-sulfat-pentahidrata, poznatijeg kao 'plavi kamen', u sušnicama sa fluidizovanim slojem. Bakar( II)-sulfat-pentahidrat je kristalohidrat u čijoj su kristalnoj strukturi četiri molekula vode vezana za bakar(II)-jon dok je peti molekul vode slobodan, tj, vodoničnim vezama povezan za sulfat-anjon. Optimalna temperatura zagrevanja kao i dužina zagrevanja za uklanjanje četiri molekula vode iz molekula pentahidrata utvrđeni su na osnovu termogravimetrijske (TGA) analize. Za analizu su upotrebljene čestice različite granualcije: srednjeg prečnika 0,17 mm i 0,5 mm. U poluindustrijskom postrojenju određene su krive fluidizacije i krive sušenja analiziranih uzoraka. Nakon laboratorijskih i poluindustrijskih eksperimenata izvršeno je materijalno i energetsko bilansiranje realnog postrojenja sa kapacitetom proizvodnje od 300 t mesečno. Proračuni neophodne količine agensa za sušenje i dimenzija postrojenja izvršeni su korišćenjem programskih paketa SuperPro Designer 5.1 i Simprosys 3.0. Takođe, analizirana je i mogućnost recirkulacije agensa za sušenje.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Calculation and optimization of the copper (II) sulphate monohydrate from copper (II) sulphate pentahydrate production process in a fluidized bed dryer
T1  - Proračun i optimizacija procesa proizvodnje bakar(II)-sulfat-monohidrata iz bakar(II)-sulfat-pentahidrata u sušnicama sa fluidizovanim slojem
EP  - 286
IS  - 3
SP  - 275
VL  - 69
DO  - 10.2298/HEMIND140211043K
ER  - 

@article{
author = "Kaluđerović-Radoičić, Tatjana and Radović, Ivona and Ivanović, Marija and Rajić, Nevenka and Grbavčić, Željko",
year = "2015",
abstract = "In this paper the process of the copper (II) sulphate monohydrate from copper (II) sulphate pentahydrate (also known as a Blue vitriol or Bluestone) production was analyzed. Copper (II) sulphate pentahydrate is one of the most important copper salts which has been known since the ancient Egyptians. In the nineteenth century its application as a fungicide was discovered which provoked wide industrial production. Molecule of the copper (II) sulphate pentahydrate is a crystalohydrate with five water molecules linked by chemical bonds to a molecule of the copper (II) sulphate. Copper (II) sulphate exists as a series of compounds that differ in their degree of hydratation. The anhydrous form is a pale green or gray-white powder, whereas the pentahydrate (CuSO4∙5H2O), the most commonly encountered salt, is bright blue. In order to obtain copper (II) sulphate monohydrate from copper (II) sulphate pentahydrate, it is necessary to remove four water molecules. To determine the optimum temperature and time required for the removal of four water molecules from a molecule of pentahydrate in this work thermogravimetric (TGA) analysis was performed. Thermogravimetric (TGA) analysis - dehydration of copper (II) sulphate pentahydrate is done using simultaneous TG-DSC thermal analyzer DTG-Q600 SDT from TA Instruments. Analysis was carried out for two types of samples, the samples containing particles of the average diameter equal to 0.17 mm and the particles of the average diameter 0.5 mm. In addition, fluidization and drying curve were determined using a semiindustrial fluidization column. On the top, the industrial fluidization column, aimed to produce 300 tonnes per month of copper (II) sulphate monohydrate, was designed. Material and energy calculations were performed using software packages Simprosys 3.0 and SuperPro Designer 5.1. Simprosys 3.0 is a software package designed for the modeling and simulation of a drying process, as well as for 20 different unit operations. SuperPro Designer 5.1 facilitates modeling, evaluation and optimization of different industrial processes including drying. These software packages were applied for the calculation of the air flow rate, heat exchange and for the scoping of a dryer., U ovom radu analiziran je proces dobijanja bakar(II)-sulfat-monohidrata iz bakar(II)-sulfat-pentahidrata, poznatijeg kao 'plavi kamen', u sušnicama sa fluidizovanim slojem. Bakar( II)-sulfat-pentahidrat je kristalohidrat u čijoj su kristalnoj strukturi četiri molekula vode vezana za bakar(II)-jon dok je peti molekul vode slobodan, tj, vodoničnim vezama povezan za sulfat-anjon. Optimalna temperatura zagrevanja kao i dužina zagrevanja za uklanjanje četiri molekula vode iz molekula pentahidrata utvrđeni su na osnovu termogravimetrijske (TGA) analize. Za analizu su upotrebljene čestice različite granualcije: srednjeg prečnika 0,17 mm i 0,5 mm. U poluindustrijskom postrojenju određene su krive fluidizacije i krive sušenja analiziranih uzoraka. Nakon laboratorijskih i poluindustrijskih eksperimenata izvršeno je materijalno i energetsko bilansiranje realnog postrojenja sa kapacitetom proizvodnje od 300 t mesečno. Proračuni neophodne količine agensa za sušenje i dimenzija postrojenja izvršeni su korišćenjem programskih paketa SuperPro Designer 5.1 i Simprosys 3.0. Takođe, analizirana je i mogućnost recirkulacije agensa za sušenje.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Calculation and optimization of the copper (II) sulphate monohydrate from copper (II) sulphate pentahydrate production process in a fluidized bed dryer, Proračun i optimizacija procesa proizvodnje bakar(II)-sulfat-monohidrata iz bakar(II)-sulfat-pentahidrata u sušnicama sa fluidizovanim slojem",
pages = "286-275",
number = "3",
volume = "69",
doi = "10.2298/HEMIND140211043K"
}

Kaluđerović-Radoičić, T., Radović, I., Ivanović, M., Rajić, N.,& Grbavčić, Ž.. (2015). Calculation and optimization of the copper (II) sulphate monohydrate from copper (II) sulphate pentahydrate production process in a fluidized bed dryer. in Hemijska industrija
Association of Chemical Engineers of Serbia., 69(3), 275-286.
https://doi.org/10.2298/HEMIND140211043K

Kaluđerović-Radoičić T, Radović I, Ivanović M, Rajić N, Grbavčić Ž. Calculation and optimization of the copper (II) sulphate monohydrate from copper (II) sulphate pentahydrate production process in a fluidized bed dryer. in Hemijska industrija. 2015;69(3):275-286.
doi:10.2298/HEMIND140211043K .

Kaluđerović-Radoičić, Tatjana, Radović, Ivona, Ivanović, Marija, Rajić, Nevenka, Grbavčić, Željko, "Calculation and optimization of the copper (II) sulphate monohydrate from copper (II) sulphate pentahydrate production process in a fluidized bed dryer" in Hemijska industrija, 69, no. 3 (2015):275-286,
https://doi.org/10.2298/HEMIND140211043K . .

TY  - JOUR
AU  - Arsenijević, Zorana
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Đuriš, Mihal
AU  - Grbavčić, Željko
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3081
AB  - A three-phase (gas-liquid-solid) fluidized bed was used to study the heat transfer characteristics of a system consisting of low-density (290 kg/m(3)) spherical particles (2 cm diameter) in a 0.25 m cylindrical column with counter-current flow of water and air. The experimental investigation and mathematical modeling of heat transfer between the hot air and the cooling water was carried out. The experiments were conducted for a variety of different fluid flow rates and inlet air temperatures, while the air flow rate was kept constant. Based on the obtained experimental results, a new correlation for heat transfer in a three-phase fluidized system was proposed. The mean percentage error between the experimental and the correlated values of the j(Hp) obtained was 1.69%. The hydrodynamic parameters of the system were also calculated according to the available literature correlations.
PB  - Savez hemijskih inženjera, Beograd
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - Experimental investigation of heat transfer in three-phase fluidized bed cooling column
EP  - 526
IS  - 4
SP  - 519
VL  - 21
DO  - 10.2298/CICEQ141022008A
ER  - 

@article{
author = "Arsenijević, Zorana and Kaluđerović-Radoičić, Tatjana and Đuriš, Mihal and Grbavčić, Željko",
year = "2015",
abstract = "A three-phase (gas-liquid-solid) fluidized bed was used to study the heat transfer characteristics of a system consisting of low-density (290 kg/m(3)) spherical particles (2 cm diameter) in a 0.25 m cylindrical column with counter-current flow of water and air. The experimental investigation and mathematical modeling of heat transfer between the hot air and the cooling water was carried out. The experiments were conducted for a variety of different fluid flow rates and inlet air temperatures, while the air flow rate was kept constant. Based on the obtained experimental results, a new correlation for heat transfer in a three-phase fluidized system was proposed. The mean percentage error between the experimental and the correlated values of the j(Hp) obtained was 1.69%. The hydrodynamic parameters of the system were also calculated according to the available literature correlations.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "Experimental investigation of heat transfer in three-phase fluidized bed cooling column",
pages = "526-519",
number = "4",
volume = "21",
doi = "10.2298/CICEQ141022008A"
}

Arsenijević, Z., Kaluđerović-Radoičić, T., Đuriš, M.,& Grbavčić, Ž.. (2015). Experimental investigation of heat transfer in three-phase fluidized bed cooling column. in Chemical Industry & Chemical Engineering Quarterly
Savez hemijskih inženjera, Beograd., 21(4), 519-526.
https://doi.org/10.2298/CICEQ141022008A

Arsenijević Z, Kaluđerović-Radoičić T, Đuriš M, Grbavčić Ž. Experimental investigation of heat transfer in three-phase fluidized bed cooling column. in Chemical Industry & Chemical Engineering Quarterly. 2015;21(4):519-526.
doi:10.2298/CICEQ141022008A .

Arsenijević, Zorana, Kaluđerović-Radoičić, Tatjana, Đuriš, Mihal, Grbavčić, Željko, "Experimental investigation of heat transfer in three-phase fluidized bed cooling column" in Chemical Industry & Chemical Engineering Quarterly, 21, no. 4 (2015):519-526,
https://doi.org/10.2298/CICEQ141022008A . .

TY  - JOUR
AU  - Pešić, Radojica
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Bošković-Vragolović, Nevenka
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2727
AB  - In this paper, heat transfer coefficients between the hot packed beds of particles and the larger cold immersed sphere were experimentally determined. The packed beds consisted of mono-sized spherical glass particles of d(p), = 1.2, 1.94 and 2.98 mm. The aluminum test spheres of D-p = 6, 12 and 20 mm with K-type (Ni/A1) thermocouples inserted in them were immersed into the bed. The temperatures of the test spheres were recorded until the thermal equilibrium was reached. From these recordings, heat transfer coefficients were determined. The experiments were performed in the range of gas superficial velocity of similar to 0.3-0.8 m/s and the bed temperature from 90 to 320 degrees C. It was found that the measured heat transfer coefficients increased with the increase in gas superficial velocity, while only a slight increase with temperature was observed for test spheres D-p = 6 and 12 mm in the investigated temperature interval. The heat transfer coefficients were generally larger for smaller test spheres, while they did not show significant dependence on the size of the bed particles. The literature correlations for heat transfer coefficients in packed beds in form of Nusselt number and heat transfer factor j(H) were compared to experimental data from this work. The correlations proposed by Collier et al. (2004) [18] and Handley and Heggs (1968) [2] fit our experimental data best. The mean error between the experimentally determined heat transfer coefficients and the ones calculated from Collier et al. (2004) [18] correlation was 12.7%.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Heat and Mass Transfer
T1  - Heat transfer between a packed bed and a larger immersed spherical particle
EP  - 136
SP  - 130
VL  - 78
DO  - 10.1016/j.ijheatmasstransfer.2014.06.040
ER  - 

@article{
author = "Pešić, Radojica and Kaluđerović-Radoičić, Tatjana and Bošković-Vragolović, Nevenka and Arsenijević, Zorana and Grbavčić, Željko",
year = "2014",
abstract = "In this paper, heat transfer coefficients between the hot packed beds of particles and the larger cold immersed sphere were experimentally determined. The packed beds consisted of mono-sized spherical glass particles of d(p), = 1.2, 1.94 and 2.98 mm. The aluminum test spheres of D-p = 6, 12 and 20 mm with K-type (Ni/A1) thermocouples inserted in them were immersed into the bed. The temperatures of the test spheres were recorded until the thermal equilibrium was reached. From these recordings, heat transfer coefficients were determined. The experiments were performed in the range of gas superficial velocity of similar to 0.3-0.8 m/s and the bed temperature from 90 to 320 degrees C. It was found that the measured heat transfer coefficients increased with the increase in gas superficial velocity, while only a slight increase with temperature was observed for test spheres D-p = 6 and 12 mm in the investigated temperature interval. The heat transfer coefficients were generally larger for smaller test spheres, while they did not show significant dependence on the size of the bed particles. The literature correlations for heat transfer coefficients in packed beds in form of Nusselt number and heat transfer factor j(H) were compared to experimental data from this work. The correlations proposed by Collier et al. (2004) [18] and Handley and Heggs (1968) [2] fit our experimental data best. The mean error between the experimentally determined heat transfer coefficients and the ones calculated from Collier et al. (2004) [18] correlation was 12.7%.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Heat and Mass Transfer",
title = "Heat transfer between a packed bed and a larger immersed spherical particle",
pages = "136-130",
volume = "78",
doi = "10.1016/j.ijheatmasstransfer.2014.06.040"
}

Pešić, R., Kaluđerović-Radoičić, T., Bošković-Vragolović, N., Arsenijević, Z.,& Grbavčić, Ž.. (2014). Heat transfer between a packed bed and a larger immersed spherical particle. in International Journal of Heat and Mass Transfer
Pergamon-Elsevier Science Ltd, Oxford., 78, 130-136.
https://doi.org/10.1016/j.ijheatmasstransfer.2014.06.040

Pešić R, Kaluđerović-Radoičić T, Bošković-Vragolović N, Arsenijević Z, Grbavčić Ž. Heat transfer between a packed bed and a larger immersed spherical particle. in International Journal of Heat and Mass Transfer. 2014;78:130-136.
doi:10.1016/j.ijheatmasstransfer.2014.06.040 .

Pešić, Radojica, Kaluđerović-Radoičić, Tatjana, Bošković-Vragolović, Nevenka, Arsenijević, Zorana, Grbavčić, Željko, "Heat transfer between a packed bed and a larger immersed spherical particle" in International Journal of Heat and Mass Transfer, 78 (2014):130-136,
https://doi.org/10.1016/j.ijheatmasstransfer.2014.06.040 . .

TY  - JOUR
AU  - Cvetković, Slobodan
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Vukadinović, Bojana
AU  - Kijevčanin, Mirjana
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2775
AB  - Biogas is a sustainable and renewable energy source that can provide green energy, a better environment and new jobs. The aim of this paper is to present potentials for biogas production in the Republic of Serbia from different sources (agricultural crops directly provided for energy, livestock residues, municipal solid waste, slaughterhouse waste and wastewater from milk processing industry) and to analyze the current situation in this sector in Serbia. The barriers that limit the wider production of biogas are considered. Results have shown that there is a great potential for biogas production in Serbia. The yearly potentials were calculated as follows: biogas production potential from agricultural crops directly cultivated for energy is 0.85 Mega tons of oil equivalent (Mtoe); potential from livestock residues amounts to 94.13 ktoe; potential from municipal solid waste (MSW) is 49.72 ktoe; potential from slaughterhouse waste is 9.94 ktoe and potential from milk processing industry is 3.21 ktoe. The analysis of incentives, barriers and status of biogas technologies presented in this paper represents a contribution for the further improvement and analysis of the biogas sector in the Republic of Serbia.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Renewable & Sustainable Energy Reviews
T1  - Potentials and status of biogas as energy source in the Republic of Serbia
EP  - 416
SP  - 407
VL  - 31
DO  - 10.1016/j.rser.2013.12.005
ER  - 

@article{
author = "Cvetković, Slobodan and Kaluđerović-Radoičić, Tatjana and Vukadinović, Bojana and Kijevčanin, Mirjana",
year = "2014",
abstract = "Biogas is a sustainable and renewable energy source that can provide green energy, a better environment and new jobs. The aim of this paper is to present potentials for biogas production in the Republic of Serbia from different sources (agricultural crops directly provided for energy, livestock residues, municipal solid waste, slaughterhouse waste and wastewater from milk processing industry) and to analyze the current situation in this sector in Serbia. The barriers that limit the wider production of biogas are considered. Results have shown that there is a great potential for biogas production in Serbia. The yearly potentials were calculated as follows: biogas production potential from agricultural crops directly cultivated for energy is 0.85 Mega tons of oil equivalent (Mtoe); potential from livestock residues amounts to 94.13 ktoe; potential from municipal solid waste (MSW) is 49.72 ktoe; potential from slaughterhouse waste is 9.94 ktoe and potential from milk processing industry is 3.21 ktoe. The analysis of incentives, barriers and status of biogas technologies presented in this paper represents a contribution for the further improvement and analysis of the biogas sector in the Republic of Serbia.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Renewable & Sustainable Energy Reviews",
title = "Potentials and status of biogas as energy source in the Republic of Serbia",
pages = "416-407",
volume = "31",
doi = "10.1016/j.rser.2013.12.005"
}

Cvetković, S., Kaluđerović-Radoičić, T., Vukadinović, B.,& Kijevčanin, M.. (2014). Potentials and status of biogas as energy source in the Republic of Serbia. in Renewable & Sustainable Energy Reviews
Pergamon-Elsevier Science Ltd, Oxford., 31, 407-416.
https://doi.org/10.1016/j.rser.2013.12.005

Cvetković S, Kaluđerović-Radoičić T, Vukadinović B, Kijevčanin M. Potentials and status of biogas as energy source in the Republic of Serbia. in Renewable & Sustainable Energy Reviews. 2014;31:407-416.
doi:10.1016/j.rser.2013.12.005 .

Cvetković, Slobodan, Kaluđerović-Radoičić, Tatjana, Vukadinović, Bojana, Kijevčanin, Mirjana, "Potentials and status of biogas as energy source in the Republic of Serbia" in Renewable & Sustainable Energy Reviews, 31 (2014):407-416,
https://doi.org/10.1016/j.rser.2013.12.005 . .

TY  - JOUR
AU  - Garić-Grulović, Radmila
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Arsenijević, Zorana
AU  - Đuriš, Mihal
AU  - Grbavčić, Željko
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2860
AB  - The one-dimensional model of accelerating turbulent downward counter-current gas-solids flow of coarse particles was formulated and experimentally verified by measuring the pressure distribution along the transport tube. The continuity and momentum equations were used in the model formulation and variational model was used for the prediction of the fluid-particle interphase drag coefficient. Experiments were performed by transporting spherical glass particles 1.94 mm in diameter in a 16 mm i.d. acrylic tube at constant solids mass flux of 392.8 kg/m(2)s. Tube Reynolds number ranged from 170 to 5300 and the slip Reynolds number from 650 to 1060. Under these conditions loading ratio (G(p)/G(f)) varied between 66 and 2089. Visual observations show that particles flow downward in apparently homogenous dispersion. Experimental data for the static fluid pressure distribution along the transport tube agree quite well with the model predictions. The mean voidage and the particle velocity decrease, while the slip velocity increases with the increase in gas superficial velocity. The values of the pressure gradient, porosity, particle velocity and slip velocity along the tube were calculated according to the formulated model. In these calculations, particle-wall friction coefficient was determined indirectly by adjusting the f(p) value to agree with the experimental data. The effect of the value of fp on the model calculations was significant. Calculations show that the acceleration length for the same particles (1.94 mm) in downward counter-current gas-solids flow is about two times higher than the acceleration length in upward co-current gas-solids flow. In the system investigated, "choking" occurs at slip velocity which is about 73% of the single particle terminal velocity.
PB  - Elsevier, Amsterdam
T2  - Powder Technology
T1  - Hydrodynamic modeling of downward gas-solids flow. Part I: Counter-current flow
EP  - 415
SP  - 404
VL  - 256
DO  - 10.1016/j.powtec.2014.01.090
ER  - 

@article{
author = "Garić-Grulović, Radmila and Kaluđerović-Radoičić, Tatjana and Arsenijević, Zorana and Đuriš, Mihal and Grbavčić, Željko",
year = "2014",
abstract = "The one-dimensional model of accelerating turbulent downward counter-current gas-solids flow of coarse particles was formulated and experimentally verified by measuring the pressure distribution along the transport tube. The continuity and momentum equations were used in the model formulation and variational model was used for the prediction of the fluid-particle interphase drag coefficient. Experiments were performed by transporting spherical glass particles 1.94 mm in diameter in a 16 mm i.d. acrylic tube at constant solids mass flux of 392.8 kg/m(2)s. Tube Reynolds number ranged from 170 to 5300 and the slip Reynolds number from 650 to 1060. Under these conditions loading ratio (G(p)/G(f)) varied between 66 and 2089. Visual observations show that particles flow downward in apparently homogenous dispersion. Experimental data for the static fluid pressure distribution along the transport tube agree quite well with the model predictions. The mean voidage and the particle velocity decrease, while the slip velocity increases with the increase in gas superficial velocity. The values of the pressure gradient, porosity, particle velocity and slip velocity along the tube were calculated according to the formulated model. In these calculations, particle-wall friction coefficient was determined indirectly by adjusting the f(p) value to agree with the experimental data. The effect of the value of fp on the model calculations was significant. Calculations show that the acceleration length for the same particles (1.94 mm) in downward counter-current gas-solids flow is about two times higher than the acceleration length in upward co-current gas-solids flow. In the system investigated, "choking" occurs at slip velocity which is about 73% of the single particle terminal velocity.",
publisher = "Elsevier, Amsterdam",
journal = "Powder Technology",
title = "Hydrodynamic modeling of downward gas-solids flow. Part I: Counter-current flow",
pages = "415-404",
volume = "256",
doi = "10.1016/j.powtec.2014.01.090"
}

Garić-Grulović, R., Kaluđerović-Radoičić, T., Arsenijević, Z., Đuriš, M.,& Grbavčić, Ž.. (2014). Hydrodynamic modeling of downward gas-solids flow. Part I: Counter-current flow. in Powder Technology
Elsevier, Amsterdam., 256, 404-415.
https://doi.org/10.1016/j.powtec.2014.01.090

Garić-Grulović R, Kaluđerović-Radoičić T, Arsenijević Z, Đuriš M, Grbavčić Ž. Hydrodynamic modeling of downward gas-solids flow. Part I: Counter-current flow. in Powder Technology. 2014;256:404-415.
doi:10.1016/j.powtec.2014.01.090 .

Garić-Grulović, Radmila, Kaluđerović-Radoičić, Tatjana, Arsenijević, Zorana, Đuriš, Mihal, Grbavčić, Željko, "Hydrodynamic modeling of downward gas-solids flow. Part I: Counter-current flow" in Powder Technology, 256 (2014):404-415,
https://doi.org/10.1016/j.powtec.2014.01.090 . .

TY  - JOUR
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Đuriš, Mihal
AU  - Garić-Grulović, Radmila
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2845
AB  - In this paper, different methods for particle characterization were applied to 16 polydisperse fractions of quartz filtration sand obtained by sieving, with sieve diameters in the interval d(m) = 0359 to 2.415. For each fraction, volume diameter was measured and projected diameter and 2D shape factor were obtained using the scanned image of the projection of a large number of particles. The correlations between the volume diameter, projected diameter and 2D shape factor with sieve diameter were proposed. All of the correlations show linear dependence between the variables. The sphericity was determined for the fractions from packed-bed pressure drop measurements; from terminal velocity measurements using different correlations for the calculation of C-D, direct correlations for U-t and from direct empirical correlations. The sphericities obtained using different methods and correlations gave very different results. Both the sphericity and the 2D shape factor were shown to decrease with increase in particle sieve diameter.
PB  - Elsevier Science Bv, Amsterdam
T2  - Powder Technology
T1  - Particle characterization of polydisperse quartz filtration sand
EP  - 71
SP  - 63
VL  - 254
DO  - 10.1016/j.powtec.2014.01.003
ER  - 

@article{
author = "Kaluđerović-Radoičić, Tatjana and Đuriš, Mihal and Garić-Grulović, Radmila and Arsenijević, Zorana and Grbavčić, Željko",
year = "2014",
abstract = "In this paper, different methods for particle characterization were applied to 16 polydisperse fractions of quartz filtration sand obtained by sieving, with sieve diameters in the interval d(m) = 0359 to 2.415. For each fraction, volume diameter was measured and projected diameter and 2D shape factor were obtained using the scanned image of the projection of a large number of particles. The correlations between the volume diameter, projected diameter and 2D shape factor with sieve diameter were proposed. All of the correlations show linear dependence between the variables. The sphericity was determined for the fractions from packed-bed pressure drop measurements; from terminal velocity measurements using different correlations for the calculation of C-D, direct correlations for U-t and from direct empirical correlations. The sphericities obtained using different methods and correlations gave very different results. Both the sphericity and the 2D shape factor were shown to decrease with increase in particle sieve diameter.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Powder Technology",
title = "Particle characterization of polydisperse quartz filtration sand",
pages = "71-63",
volume = "254",
doi = "10.1016/j.powtec.2014.01.003"
}

Kaluđerović-Radoičić, T., Đuriš, M., Garić-Grulović, R., Arsenijević, Z.,& Grbavčić, Ž.. (2014). Particle characterization of polydisperse quartz filtration sand. in Powder Technology
Elsevier Science Bv, Amsterdam., 254, 63-71.
https://doi.org/10.1016/j.powtec.2014.01.003

Kaluđerović-Radoičić T, Đuriš M, Garić-Grulović R, Arsenijević Z, Grbavčić Ž. Particle characterization of polydisperse quartz filtration sand. in Powder Technology. 2014;254:63-71.
doi:10.1016/j.powtec.2014.01.003 .

Kaluđerović-Radoičić, Tatjana, Đuriš, Mihal, Garić-Grulović, Radmila, Arsenijević, Zorana, Grbavčić, Željko, "Particle characterization of polydisperse quartz filtration sand" in Powder Technology, 254 (2014):63-71,
https://doi.org/10.1016/j.powtec.2014.01.003 . .

TY  - JOUR
AU  - Arsenijević, Zorana
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Garić-Grulović, Radmila
AU  - Đuriš, Mihal
AU  - Grbavčić, Željko
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2859
AB  - The one-dimensional model of accelerating turbulent downward co-current gas-solid flow of coarse particles was formulated and experimentally verified by measuring the pressure distribution along the transport tube. The continuity and momentum equations were used in the model formulation and variational model was used for the prediction of the fluid-particle interphase drag coefficient. The experiments were performed by transporting spherical glass particles 1.94 mm in diameter in a 16 mm i.d. acrylic tube at constant solid mass flux of 392.8 kg/m(2) s. Tube Reynolds number ranged from 880 to 11,300 and the slip Reynolds number from 32 to 670. At these conditions, the loading ratio G(p)/G(f) was in the range from 395 to 31. Experimental data for the static fluid pressure distribution along the transport tube agree quite well with the model predictions. The results measured at a distance of 1.51 m from the transport tube inlet show that the particle velocity and the mean voidage increase with the increase in superficial gas velocity. The slip velocity changes from negative values at low gas superficial velocities to positive values at high gas superficial velocities. The same trend was observed for the change of the pressure gradient in the system. The values of the pressure gradient, porosity, particle velocity and slip velocity along the tube were calculated according to the formulated model. The distance from the transport tube inlet at which the slip velocity changes its sign from positive to negative is the function of the gas superficial velocity. At positive slip velocity both gravity and drag contribute to particle acceleration. At negative slip velocity the drag force acts in upward direction resisting the particle acceleration. In downward co-current gas-solid flow acceleration length is relatively long, about two times longer compared to the upward co-current gas-solid flow.
PB  - Elsevier, Amsterdam
T2  - Powder Technology
T1  - Hydrodynamic modeling of downward gas-solid flow. Part II: Co-current flow
EP  - 427
SP  - 416
VL  - 256
DO  - 10.1016/j.powtec.2014.01.091
ER  - 

@article{
author = "Arsenijević, Zorana and Kaluđerović-Radoičić, Tatjana and Garić-Grulović, Radmila and Đuriš, Mihal and Grbavčić, Željko",
year = "2014",
abstract = "The one-dimensional model of accelerating turbulent downward co-current gas-solid flow of coarse particles was formulated and experimentally verified by measuring the pressure distribution along the transport tube. The continuity and momentum equations were used in the model formulation and variational model was used for the prediction of the fluid-particle interphase drag coefficient. The experiments were performed by transporting spherical glass particles 1.94 mm in diameter in a 16 mm i.d. acrylic tube at constant solid mass flux of 392.8 kg/m(2) s. Tube Reynolds number ranged from 880 to 11,300 and the slip Reynolds number from 32 to 670. At these conditions, the loading ratio G(p)/G(f) was in the range from 395 to 31. Experimental data for the static fluid pressure distribution along the transport tube agree quite well with the model predictions. The results measured at a distance of 1.51 m from the transport tube inlet show that the particle velocity and the mean voidage increase with the increase in superficial gas velocity. The slip velocity changes from negative values at low gas superficial velocities to positive values at high gas superficial velocities. The same trend was observed for the change of the pressure gradient in the system. The values of the pressure gradient, porosity, particle velocity and slip velocity along the tube were calculated according to the formulated model. The distance from the transport tube inlet at which the slip velocity changes its sign from positive to negative is the function of the gas superficial velocity. At positive slip velocity both gravity and drag contribute to particle acceleration. At negative slip velocity the drag force acts in upward direction resisting the particle acceleration. In downward co-current gas-solid flow acceleration length is relatively long, about two times longer compared to the upward co-current gas-solid flow.",
publisher = "Elsevier, Amsterdam",
journal = "Powder Technology",
title = "Hydrodynamic modeling of downward gas-solid flow. Part II: Co-current flow",
pages = "427-416",
volume = "256",
doi = "10.1016/j.powtec.2014.01.091"
}

Arsenijević, Z., Kaluđerović-Radoičić, T., Garić-Grulović, R., Đuriš, M.,& Grbavčić, Ž.. (2014). Hydrodynamic modeling of downward gas-solid flow. Part II: Co-current flow. in Powder Technology
Elsevier, Amsterdam., 256, 416-427.
https://doi.org/10.1016/j.powtec.2014.01.091

Arsenijević Z, Kaluđerović-Radoičić T, Garić-Grulović R, Đuriš M, Grbavčić Ž. Hydrodynamic modeling of downward gas-solid flow. Part II: Co-current flow. in Powder Technology. 2014;256:416-427.
doi:10.1016/j.powtec.2014.01.091 .

Arsenijević, Zorana, Kaluđerović-Radoičić, Tatjana, Garić-Grulović, Radmila, Đuriš, Mihal, Grbavčić, Željko, "Hydrodynamic modeling of downward gas-solid flow. Part II: Co-current flow" in Powder Technology, 256 (2014):416-427,
https://doi.org/10.1016/j.powtec.2014.01.091 . .

TY  - JOUR
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Đuriš, Mihal
AU  - Garić-Grulović, Radmila
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2774
AB  - The equations for the overall particle circulation rate and the frequency of particle-particle collisions in the quasi two-dimenional water-fluidized bed were proposed. The equations were based on the experimental results obtained from the water fluidized beds of mono-sized spherical glass particles d(p) = 1.94, 2.98,4.00 and 6.00 mm in diameter and the correlation for the mean particle speed from our previous paper [14] The optimal porosity of the fluidized bed was defined as the porosity at which the overall circulation rate or the frequency of collisions shows their maximum. The optimal porosities were calcylated from the derivatives of the proposed correlations. The calculated optimal porosity was in the range 0.68-0.72 for the overall circulation rate, and 0.59-0.64 for the frequency of particle-particle collisions. The results obtained are in accordance with the experimental findings from the literature [2,3,23] which show that the maximum values of the heat and mass transport coefficients in the liquid fluidized beds are reached in the range of porosities between 0.6 and 0.8. By visual observations of the monolayer fluidized bed of spherical particles 10 mm in diameter we concluded that the collisions in the liquid fluidized beds in most cases are not pairwise, but that the particles which collide often move together for some time in agglomerates before separating. The majority of collisions in fluidized beds differ very much from the instantaneous collisions as regarded in the kinetic theory of gases. Therefore, the overall circulation rate is a better measure of the dynamics of the fluidized bed and the intensity of transport properties than the frequency of collisions.
PB  - Elsevier Science Bv, Amsterdam
T2  - Powder Technology
T1  - Solid circulation rate and particle collisions in quasi two-dimensional water fluidized beds of spherical particles
EP  - 303
SP  - 295
VL  - 253
DO  - 10.1016/j.powtec.2013.11.038
ER  - 

@article{
author = "Kaluđerović-Radoičić, Tatjana and Đuriš, Mihal and Garić-Grulović, Radmila and Arsenijević, Zorana and Grbavčić, Željko",
year = "2014",
abstract = "The equations for the overall particle circulation rate and the frequency of particle-particle collisions in the quasi two-dimenional water-fluidized bed were proposed. The equations were based on the experimental results obtained from the water fluidized beds of mono-sized spherical glass particles d(p) = 1.94, 2.98,4.00 and 6.00 mm in diameter and the correlation for the mean particle speed from our previous paper [14] The optimal porosity of the fluidized bed was defined as the porosity at which the overall circulation rate or the frequency of collisions shows their maximum. The optimal porosities were calcylated from the derivatives of the proposed correlations. The calculated optimal porosity was in the range 0.68-0.72 for the overall circulation rate, and 0.59-0.64 for the frequency of particle-particle collisions. The results obtained are in accordance with the experimental findings from the literature [2,3,23] which show that the maximum values of the heat and mass transport coefficients in the liquid fluidized beds are reached in the range of porosities between 0.6 and 0.8. By visual observations of the monolayer fluidized bed of spherical particles 10 mm in diameter we concluded that the collisions in the liquid fluidized beds in most cases are not pairwise, but that the particles which collide often move together for some time in agglomerates before separating. The majority of collisions in fluidized beds differ very much from the instantaneous collisions as regarded in the kinetic theory of gases. Therefore, the overall circulation rate is a better measure of the dynamics of the fluidized bed and the intensity of transport properties than the frequency of collisions.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Powder Technology",
title = "Solid circulation rate and particle collisions in quasi two-dimensional water fluidized beds of spherical particles",
pages = "303-295",
volume = "253",
doi = "10.1016/j.powtec.2013.11.038"
}

Kaluđerović-Radoičić, T., Đuriš, M., Garić-Grulović, R., Arsenijević, Z.,& Grbavčić, Ž.. (2014). Solid circulation rate and particle collisions in quasi two-dimensional water fluidized beds of spherical particles. in Powder Technology
Elsevier Science Bv, Amsterdam., 253, 295-303.
https://doi.org/10.1016/j.powtec.2013.11.038

Kaluđerović-Radoičić T, Đuriš M, Garić-Grulović R, Arsenijević Z, Grbavčić Ž. Solid circulation rate and particle collisions in quasi two-dimensional water fluidized beds of spherical particles. in Powder Technology. 2014;253:295-303.
doi:10.1016/j.powtec.2013.11.038 .

Kaluđerović-Radoičić, Tatjana, Đuriš, Mihal, Garić-Grulović, Radmila, Arsenijević, Zorana, Grbavčić, Željko, "Solid circulation rate and particle collisions in quasi two-dimensional water fluidized beds of spherical particles" in Powder Technology, 253 (2014):295-303,
https://doi.org/10.1016/j.powtec.2013.11.038 . .