TY  - JOUR
AU  - Baena-Moreno, Francisco M.
AU  - Leventaki, Emmanouela
AU  - Ho, Phuoc Hoang
AU  - Tajik, Abdul Raouf
AU  - Brzić, Danica
AU  - Sardina, Gaetano
AU  - Ström, Henrik
AU  - Bernin, Diana
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6312
AB  - Carbon dioxide storage is one of the main long-term strategies for reducing carbon dioxide emissions in the atmosphere. A clear example is Norway's Longship project. If these projects should succeed, the transport of huge volumes of carbon dioxide from the emissions source to the injection points may become a complex challenge. In this work, we propose the production of sodium-based organic carbonates that could be transported to storage sites and be reconverted to CO2. Solid carbonates can be transported in considerably lower volumes than gases or pressurized liquids. Sodium-based carbonates are insoluble in most of the organic solvents and will therefore precipitate in contrast to in aqueous solutions. Particularly, here we focus on sodium hydroxide-ethanol mixtures as solvents for precipitating sodium ethyl carbonate and sodium bicarbonate. Previous works on this approach used limited sodium hydroxide concentrations, which are insufficient to prove the effectiveness of the proposed process. In this paper, we studied higher sodium hydroxide concentrations in sodium hydroxide-ethanol mixtures than previously reported in the literature. To this end, we use the following strategy: (1) In-line monitoring of the formation of carbonates using an in-line FTIR; (2) In-line measurements of the weight increase, which correspond directly to the captured carbon dioxide and reveal the absorption capacity; (3) Characterization of the solids with X-ray diffraction and scanning electron microscope. Our FTIR results confirmed that both sodium ethyl carbonate and sodium bicarbonate were formed, which agrees with X-ray diffraction and scanning electron microscope. With this reactor design, the absorption capacities reached approximately 80–93% of the theoretical values (4.8–13.3 g/L respectively). We hypothesize that full conversion is hampered because the gas might take preferential paths due to gel formation during the experiments.
PB  - Elsevier Ltd
T2  - Heliyon
T1  - Potential of organic carbonates production for efficient carbon dioxide capture, transport and storage: Reaction performance with sodium hydroxide–ethanol mixtures
IS  - 3
SP  - e14140
VL  - 9
DO  - 10.1016/j.heliyon.2023.e14140
ER  - 

@article{
author = "Baena-Moreno, Francisco M. and Leventaki, Emmanouela and Ho, Phuoc Hoang and Tajik, Abdul Raouf and Brzić, Danica and Sardina, Gaetano and Ström, Henrik and Bernin, Diana",
year = "2023",
abstract = "Carbon dioxide storage is one of the main long-term strategies for reducing carbon dioxide emissions in the atmosphere. A clear example is Norway's Longship project. If these projects should succeed, the transport of huge volumes of carbon dioxide from the emissions source to the injection points may become a complex challenge. In this work, we propose the production of sodium-based organic carbonates that could be transported to storage sites and be reconverted to CO2. Solid carbonates can be transported in considerably lower volumes than gases or pressurized liquids. Sodium-based carbonates are insoluble in most of the organic solvents and will therefore precipitate in contrast to in aqueous solutions. Particularly, here we focus on sodium hydroxide-ethanol mixtures as solvents for precipitating sodium ethyl carbonate and sodium bicarbonate. Previous works on this approach used limited sodium hydroxide concentrations, which are insufficient to prove the effectiveness of the proposed process. In this paper, we studied higher sodium hydroxide concentrations in sodium hydroxide-ethanol mixtures than previously reported in the literature. To this end, we use the following strategy: (1) In-line monitoring of the formation of carbonates using an in-line FTIR; (2) In-line measurements of the weight increase, which correspond directly to the captured carbon dioxide and reveal the absorption capacity; (3) Characterization of the solids with X-ray diffraction and scanning electron microscope. Our FTIR results confirmed that both sodium ethyl carbonate and sodium bicarbonate were formed, which agrees with X-ray diffraction and scanning electron microscope. With this reactor design, the absorption capacities reached approximately 80–93% of the theoretical values (4.8–13.3 g/L respectively). We hypothesize that full conversion is hampered because the gas might take preferential paths due to gel formation during the experiments.",
publisher = "Elsevier Ltd",
journal = "Heliyon",
title = "Potential of organic carbonates production for efficient carbon dioxide capture, transport and storage: Reaction performance with sodium hydroxide–ethanol mixtures",
number = "3",
pages = "e14140",
volume = "9",
doi = "10.1016/j.heliyon.2023.e14140"
}

Baena-Moreno, F. M., Leventaki, E., Ho, P. H., Tajik, A. R., Brzić, D., Sardina, G., Ström, H.,& Bernin, D.. (2023). Potential of organic carbonates production for efficient carbon dioxide capture, transport and storage: Reaction performance with sodium hydroxide–ethanol mixtures. in Heliyon
Elsevier Ltd., 9(3), e14140.
https://doi.org/10.1016/j.heliyon.2023.e14140

Baena-Moreno FM, Leventaki E, Ho PH, Tajik AR, Brzić D, Sardina G, Ström H, Bernin D. Potential of organic carbonates production for efficient carbon dioxide capture, transport and storage: Reaction performance with sodium hydroxide–ethanol mixtures. in Heliyon. 2023;9(3):e14140.
doi:10.1016/j.heliyon.2023.e14140 .

Baena-Moreno, Francisco M., Leventaki, Emmanouela, Ho, Phuoc Hoang, Tajik, Abdul Raouf, Brzić, Danica, Sardina, Gaetano, Ström, Henrik, Bernin, Diana, "Potential of organic carbonates production for efficient carbon dioxide capture, transport and storage: Reaction performance with sodium hydroxide–ethanol mixtures" in Heliyon, 9, no. 3 (2023):e14140,
https://doi.org/10.1016/j.heliyon.2023.e14140 . .

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  - Jaćimovski, Darko
AU  - Brzić, Danica
AU  - Garić-Grulović, Radmila
AU  - Pjanović, Rada
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Bošković-Vragolović, Nevenka
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5064
AB  - In this work the theoretical model for heat transfer from a wall to a
liquid-solid fluidized bed by liquid convective mechanism has been proposed.
The model is based on thickness of boundary layer and film theory. The key
parameter in the model is the distance between two adjacent particles which
collide with the wall. According to the proposed model, the liquid convective
heat transfer in a fluidized bed is 4 to 5 times more intense than in a single-phase
flow. Additionally, the wall-to-bed heat transfer coefficient has been measured
experimentally in water –glass particles fluidized bed, for different particle sizes.
Comparison of the model prediction with experimental data has shown that size
of the particles strongly influences the mechanism of heat transfer. For fine
particles of 0.8 mm in diameter, the liquid convective heat transfer model
represents adequately the experimental data, indicating that particle convective
mechanism is negligible. For coarse particles of 1.5 - 2 mm in diameter, the
liquid convective heat transfer mechanism accounts for 60 % of the overall heat
transfer coefficient
AB  - У овом раду развијен је теоријски модел преноса топлоте конвективним механизмом
са зида колоне на течност у партикулативно флуидизованом слоју. Модел је заснован на
дебљини граничног слоја и теорији филма. Кључни параметар модела је растојање између
двe суседне честице које се сударају са зидом колоне. Према предложеном моделу пренос
топлоте конвекцијом на течност у флуидизованом слоју је 4 до 5 пута интензивнији него у
једнофазном току. Коефицијенти преноса топлоте су експериментално одређени у
флуидизованом слоју вода-стаклене сфере, за различите пречнике честица. Поређење
експерименталних резултата и предвиђања модела је показало да пречник честица значајно
утиче на механизам преноса топлоте. За веома ситне честице пречника 0.8 mm, модел
преноса топлоте конвекцијом на течност у потпуности репрезентује експерименталне
резултате, указујући да је пренос топлоте честицама занемарљив. За крупне честице,
пречника 1.5 -2 mm, конвективни пренос на течност чини 60 % од укупног коефицијента
преноса топлоте
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Heat transfer by liquid convection in particulate fluidized beds
T1  - ПРЕНОС ТОПЛОТЕ КОНВЕКТИВНИМ МЕХАНИЗМОМ У ПАРТИКУЛАТИВНО ФЛУИДИЗОВАНОМ СЛОЈУ
DO  - 10.2298/JSC211216020J
ER  - 

@article{
author = "Jaćimovski, Darko and Brzić, Danica and Garić-Grulović, Radmila and Pjanović, Rada and Đuriš, Mihal and Arsenijević, Zorana and Bošković-Vragolović, Nevenka",
year = "2022",
abstract = "In this work the theoretical model for heat transfer from a wall to a
liquid-solid fluidized bed by liquid convective mechanism has been proposed.
The model is based on thickness of boundary layer and film theory. The key
parameter in the model is the distance between two adjacent particles which
collide with the wall. According to the proposed model, the liquid convective
heat transfer in a fluidized bed is 4 to 5 times more intense than in a single-phase
flow. Additionally, the wall-to-bed heat transfer coefficient has been measured
experimentally in water –glass particles fluidized bed, for different particle sizes.
Comparison of the model prediction with experimental data has shown that size
of the particles strongly influences the mechanism of heat transfer. For fine
particles of 0.8 mm in diameter, the liquid convective heat transfer model
represents adequately the experimental data, indicating that particle convective
mechanism is negligible. For coarse particles of 1.5 - 2 mm in diameter, the
liquid convective heat transfer mechanism accounts for 60 % of the overall heat
transfer coefficient, У овом раду развијен је теоријски модел преноса топлоте конвективним механизмом
са зида колоне на течност у партикулативно флуидизованом слоју. Модел је заснован на
дебљини граничног слоја и теорији филма. Кључни параметар модела је растојање између
двe суседне честице које се сударају са зидом колоне. Према предложеном моделу пренос
топлоте конвекцијом на течност у флуидизованом слоју је 4 до 5 пута интензивнији него у
једнофазном току. Коефицијенти преноса топлоте су експериментално одређени у
флуидизованом слоју вода-стаклене сфере, за различите пречнике честица. Поређење
експерименталних резултата и предвиђања модела је показало да пречник честица значајно
утиче на механизам преноса топлоте. За веома ситне честице пречника 0.8 mm, модел
преноса топлоте конвекцијом на течност у потпуности репрезентује експерименталне
резултате, указујући да је пренос топлоте честицама занемарљив. За крупне честице,
пречника 1.5 -2 mm, конвективни пренос на течност чини 60 % од укупног коефицијента
преноса топлоте",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Heat transfer by liquid convection in particulate fluidized beds, ПРЕНОС ТОПЛОТЕ КОНВЕКТИВНИМ МЕХАНИЗМОМ У ПАРТИКУЛАТИВНО ФЛУИДИЗОВАНОМ СЛОЈУ",
doi = "10.2298/JSC211216020J"
}

Jaćimovski, D., Brzić, D., Garić-Grulović, R., Pjanović, R., Đuriš, M., Arsenijević, Z.,& Bošković-Vragolović, N.. (2022). Heat transfer by liquid convection in particulate fluidized beds. in Journal of the Serbian Chemical Society
Serbian Chemical Society..
https://doi.org/10.2298/JSC211216020J

Jaćimovski D, Brzić D, Garić-Grulović R, Pjanović R, Đuriš M, Arsenijević Z, Bošković-Vragolović N. Heat transfer by liquid convection in particulate fluidized beds. in Journal of the Serbian Chemical Society. 2022;.
doi:10.2298/JSC211216020J .

Jaćimovski, Darko, Brzić, Danica, Garić-Grulović, Radmila, Pjanović, Rada, Đuriš, Mihal, Arsenijević, Zorana, Bošković-Vragolović, Nevenka, "Heat transfer by liquid convection in particulate fluidized beds" in Journal of the Serbian Chemical Society (2022),
https://doi.org/10.2298/JSC211216020J . .

TY  - JOUR
AU  - Jaćimovski, Darko R.
AU  - Brzić, Danica V.
AU  - Garić-Grulović, Radmila V.
AU  - Pjanović, Rada V.
AU  - Đuriš, Mihal M.
AU  - Arsenijević, Zorana L.J.
AU  - Bošković-Vragolović, Nevenka M.
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5231
AB  - In this work the theoretical model for heat transfer from a wall to a liquid-solid fluidized bed by liquid convective mechanism has been proposed and developed. The model is based on thickness of boundary layer and film theory. The key parameter in the model is the distance between two adjacent particles which collide with the wall. According to the proposed model, the liquid convective heat transfer in a fluidized bed is 4 to 5 times more intense than in a single-phase flow. Additionally, the wall-to-bed heat transfer coefficient has been measured experimentally in water–glass particles fluidized bed, for different particle sizes. Comparison of the model prediction with experimental data has shown that size of the particles strongly influences the mechanism of heat transfer. For fine particles of 0.8 mm in diameter, the liquid convective heat transfer model represents adequately the experimental data, indicating that particle convective mechanism is negligible. For coarse particles of 1.5–2 mm in diameter, the liquid convective heat transfer mechanism accounts for 60 % of the overall heat transfer coefficient.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Heat transfer by liquid convection in particulate fluidized beds
T1  - ПРЕНОС ТОПЛОТЕ КОНВЕКТИВНИМ МЕХАНИЗМОМ У ПАРТИКУЛАТИВНО ФЛУИДИЗОВАНОМ СЛОЈУ
EP  - 924
IS  - 7-8
SP  - 911
VL  - 87
DO  - 10.2298/JSC211216020J
ER  - 

@article{
author = "Jaćimovski, Darko R. and Brzić, Danica V. and Garić-Grulović, Radmila V. and Pjanović, Rada V. and Đuriš, Mihal M. and Arsenijević, Zorana L.J. and Bošković-Vragolović, Nevenka M.",
year = "2022",
abstract = "In this work the theoretical model for heat transfer from a wall to a liquid-solid fluidized bed by liquid convective mechanism has been proposed and developed. The model is based on thickness of boundary layer and film theory. The key parameter in the model is the distance between two adjacent particles which collide with the wall. According to the proposed model, the liquid convective heat transfer in a fluidized bed is 4 to 5 times more intense than in a single-phase flow. Additionally, the wall-to-bed heat transfer coefficient has been measured experimentally in water–glass particles fluidized bed, for different particle sizes. Comparison of the model prediction with experimental data has shown that size of the particles strongly influences the mechanism of heat transfer. For fine particles of 0.8 mm in diameter, the liquid convective heat transfer model represents adequately the experimental data, indicating that particle convective mechanism is negligible. For coarse particles of 1.5–2 mm in diameter, the liquid convective heat transfer mechanism accounts for 60 % of the overall heat transfer coefficient.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Heat transfer by liquid convection in particulate fluidized beds, ПРЕНОС ТОПЛОТЕ КОНВЕКТИВНИМ МЕХАНИЗМОМ У ПАРТИКУЛАТИВНО ФЛУИДИЗОВАНОМ СЛОЈУ",
pages = "924-911",
number = "7-8",
volume = "87",
doi = "10.2298/JSC211216020J"
}

Jaćimovski, D. R., Brzić, D. V., Garić-Grulović, R. V., Pjanović, R. V., Đuriš, M. M., Arsenijević, Z. L.J.,& Bošković-Vragolović, N. M.. (2022). Heat transfer by liquid convection in particulate fluidized beds. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 87(7-8), 911-924.
https://doi.org/10.2298/JSC211216020J

Jaćimovski DR, Brzić DV, Garić-Grulović RV, Pjanović RV, Đuriš MM, Arsenijević ZL, Bošković-Vragolović NM. Heat transfer by liquid convection in particulate fluidized beds. in Journal of the Serbian Chemical Society. 2022;87(7-8):911-924.
doi:10.2298/JSC211216020J .

Jaćimovski, Darko R., Brzić, Danica V., Garić-Grulović, Radmila V., Pjanović, Rada V., Đuriš, Mihal M., Arsenijević, Zorana L.J., Bošković-Vragolović, Nevenka M., "Heat transfer by liquid convection in particulate fluidized beds" in Journal of the Serbian Chemical Society, 87, no. 7-8 (2022):911-924,
https://doi.org/10.2298/JSC211216020J . .

TY  - JOUR
AU  - Brzić, Danica
AU  - Petkovska, Menka
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4211
AB  - In the present paper, the Nonlinear Frequency Response (NFR) analysis is applied for theoretical study of kinetics of adsorption governed by pore-surface diffusion. The concept of higher-order frequency response functions (FRFs) is used. Based on a nonlinear mathematical model for adsorption of pure gas and spherical adsorbent particles, the theoretical first-and second-order FRFs, which relate the adsorbate concentration in the particle to the surrounding pressure (F-1 (omega) and F-2 (omega,omega)), have been derived. The obtained FRFs have been simulated for different steady-state pressures and different ratios (between zero and one) of surface to pore diffusion coefficients. The results show that, unlike F-1 (omega), F-2 (omega,omega) exhibits features which unambiguously distinguish the pore-surface diffusion model from pure pore diffusion and micropore diffusion. Based on the characteristic features of F-1 (omega) and F-2 (omega,omega), a new methodology for direct estimation of the separate values of the pore and surface diffusion coefficients has been established.
PB  - Hindawi Ltd, London
T2  - Mathematical Problems in Engineering
T1  - Nonlinear Frequency Response Analysis as a Tool for Identification of Adsorption Kinetics: Case Study-Pore-Surface Diffusion Control
VL  - 2019
DO  - 10.1155/2019/7932967
ER  - 

@article{
author = "Brzić, Danica and Petkovska, Menka",
year = "2019",
abstract = "In the present paper, the Nonlinear Frequency Response (NFR) analysis is applied for theoretical study of kinetics of adsorption governed by pore-surface diffusion. The concept of higher-order frequency response functions (FRFs) is used. Based on a nonlinear mathematical model for adsorption of pure gas and spherical adsorbent particles, the theoretical first-and second-order FRFs, which relate the adsorbate concentration in the particle to the surrounding pressure (F-1 (omega) and F-2 (omega,omega)), have been derived. The obtained FRFs have been simulated for different steady-state pressures and different ratios (between zero and one) of surface to pore diffusion coefficients. The results show that, unlike F-1 (omega), F-2 (omega,omega) exhibits features which unambiguously distinguish the pore-surface diffusion model from pure pore diffusion and micropore diffusion. Based on the characteristic features of F-1 (omega) and F-2 (omega,omega), a new methodology for direct estimation of the separate values of the pore and surface diffusion coefficients has been established.",
publisher = "Hindawi Ltd, London",
journal = "Mathematical Problems in Engineering",
title = "Nonlinear Frequency Response Analysis as a Tool for Identification of Adsorption Kinetics: Case Study-Pore-Surface Diffusion Control",
volume = "2019",
doi = "10.1155/2019/7932967"
}

Brzić, D.,& Petkovska, M.. (2019). Nonlinear Frequency Response Analysis as a Tool for Identification of Adsorption Kinetics: Case Study-Pore-Surface Diffusion Control. in Mathematical Problems in Engineering
Hindawi Ltd, London., 2019.
https://doi.org/10.1155/2019/7932967

Brzić D, Petkovska M. Nonlinear Frequency Response Analysis as a Tool for Identification of Adsorption Kinetics: Case Study-Pore-Surface Diffusion Control. in Mathematical Problems in Engineering. 2019;2019.
doi:10.1155/2019/7932967 .

Brzić, Danica, Petkovska, Menka, "Nonlinear Frequency Response Analysis as a Tool for Identification of Adsorption Kinetics: Case Study-Pore-Surface Diffusion Control" in Mathematical Problems in Engineering, 2019 (2019),
https://doi.org/10.1155/2019/7932967 . .

TY  - THES
AU  - Brzić, Danica
PY  - 2016
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=3673
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:12479/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=48123919
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4636
AB  - The understanding of complex kinetic mechanisms of gas-solid adsorption is a challenging issue. The Frequency Response (FR) method, which has commonly been used for studying the kinetics of adsorption, analyzes the frequency response of the system in a linear range, and therefore partly fails to identify and characterize the kinetics of nonlinear adsorption phenomena. In the frame of this thesis, the applicability of a new Nonlinear Frequency Response (NFR) method for characterization of kinetics and equilibria of gas adsorption, was investigated. The NFR method is based on the analysis of the frequency responses for a rather large amplitude input excitation, named Nonlinear Frequency Responses, and determination of the higher-order frequency response functions (FRFs), by applying the Volterra series and generalized Fourier transform. The applicability of the NFR method for characterization of kinetics and equilibria of pure gas adsorption was investigated both theoretically and experimentally, for the case of a batch adsorber. The critical issue regarding the applicability of the NFR method was determination of the second-order FRF on the adsorbent particle scale. The theoretical investigation comprises two parts. The first part of investigation is based on the numerical simulations of the dynamic responses of a batch adsorption system, by using mathematical models on the adsorber scale and adsorbent particle scale. As a result, the procedure for designing the NFR experiments has been established. In the second part, the theoretical FRFs up to the second-order for nonisothermal macropore diffusion (NMD) model, as one of the common mechanisms of gas-solid adsorption, have been derived and analyzed. As a result, the methodology for estimation of the parameters of NMD model, based on the characteristics of the FRFs, was established. In order to validate the NFR method experimentally, a new experimental set-up was designed and constructed. The working principle of the apparatus is modulation of the volume of the closed cell in a sinusiodal way, with variable amplitude and frequency, and measuring the pressure, adsorbent temperature and gas temperature responses. The test system was CO2/ zeolite 5A particles. The results showed that the NFR method can be applied for identification of the kinetic mechanism and estimation of equilibrium and kinetic data. It was also shown, that it is advantageous compared to the linear FR method in terms of reliability of identification of the kinetic model based on the second-order FRF, as well as in the possibility to estimate both kinetic and equilibrium data. Since this work represents the first evidence of experimental application of the NFR method for investigation of gas adsorption, it opens significant new perspectives in this field.
AB  - Razumevanje složenih kinetičkih mehanizama adsorpcije gas-čvrsto predstavlja izazov u savremenom istraživanju. Klasična Frekventna metoda, koja se uobičajeno koristi za ispitivanje kinetike adsorpcije, analizira frekventni odziv sistema u linearnoj oblasti i zato ne može u potpunosti da okarakteriše kinetiku nelinearnih procesa adsorpcije. U okviru ove disertacije ispitivana je primenljivost metode Nelinearnog Frekventnog Odziva (NFO) za karakterizaciju kinetike i ravnoteže adsorpcije gas-čvrsto. Metoda NFO se zasniva na analiziranju frekventnog odziva sistema na ulaznu pobudu relativno velike amplitude i određivanju frekventnih prenosnih funkcija (FPF) višeg reda, uz korišćenje Volterra redova i generalizovane Furijeove transformacije. Primenljivost metode NFO za karakterizaciju kinetike i ravnoteže adsorpcije čistih gasova je ispitivana teorijski i eksperimentalno u zatvorenom (šaržnom) sistemu. Ključno pitanje u pogledu primenljivosti metode NFO je mogućnost određivanja frekventne prenosne funkcije drugog reda na nivou čestice adsorbensa. Teorijsko istraživanje se sastoji od dva dela. Prvi deo se zasniva na numeričkim simulacijama dinamičkih odziva šaržnog adsorbera, uz korišćenje matematičkih modela na nivou adsorbera i na nivou čestice adsorbensa. Na osnovu dobijenih rezultata ustanovljena je procedura za planiranje nelinearnih frekventnih eksperimenata. U drugom delu, izvedene su i analizirane FPF prvog i drugog reda za model neizotermne diffuzije kroz makropore, koji je jedan od čestih mehanizama adsorpcije gasova. Na osnovu rezultata ustanovljena je procedura za određivanje parametara pomenutog modela na osnovu karakteristika FPF. Da bi se metoda eksperimentalno potvrdila, projektovan je i izgrađen novi eksperimentalni sistem. Princip rada ovog sistema je promena zapremine sistema po sinusnom zakonu, sa promenljivom amplitudom i frekvencijom, i merenje odziva pritiska gasa, temperature adsorbensa i temperature gasa. Kao test sistem za eksperimente korišćen je adsorpcioni sistem CO2/ zeolit 5A. Rezultati su pokazali da je moguće primeniti metodu NFO za utvrđivanje kinetičkog mehanizma adsorpcije gasova kao i za određivanje kinetičkih i ravnotežnih parametara. Takođe je pokazano da metoda NFO ima značajne prednosti u odnosu na klasičnu (linearnu) frekventnu metodu, i to u pogledu pouzdanosti utvrđivanja kinetičkog mehanizma na osnovu oblika FPF drugog reda kao i u pogledu mogućnosti određivanja i kinetičkih i ravnotežnih podataka iz istih eksperimentalnih podataka. U ovom radu je prvi put eksperimentalno potvrđena mogućnost ispitivanja adsorpcije gasčvrsto korišćenjem metode NFO, čime se otvaraju značajne nove perspektive u toj oblasti.
PB  - Univerzitet u Beogradu, Tehnološko-metalurški fakultet
T1  - Application of nonlinear frequency response method for investigation of equlibrium and kinetics of gas-solid adsorption
T1  - Primena nelinearne frekventne metode na ispitivanje ravnoteže i kinetike adsorpcionih sistema gas-čvrsto
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4636
ER  - 

@phdthesis{
author = "Brzić, Danica",
year = "2016",
abstract = "The understanding of complex kinetic mechanisms of gas-solid adsorption is a challenging issue. The Frequency Response (FR) method, which has commonly been used for studying the kinetics of adsorption, analyzes the frequency response of the system in a linear range, and therefore partly fails to identify and characterize the kinetics of nonlinear adsorption phenomena. In the frame of this thesis, the applicability of a new Nonlinear Frequency Response (NFR) method for characterization of kinetics and equilibria of gas adsorption, was investigated. The NFR method is based on the analysis of the frequency responses for a rather large amplitude input excitation, named Nonlinear Frequency Responses, and determination of the higher-order frequency response functions (FRFs), by applying the Volterra series and generalized Fourier transform. The applicability of the NFR method for characterization of kinetics and equilibria of pure gas adsorption was investigated both theoretically and experimentally, for the case of a batch adsorber. The critical issue regarding the applicability of the NFR method was determination of the second-order FRF on the adsorbent particle scale. The theoretical investigation comprises two parts. The first part of investigation is based on the numerical simulations of the dynamic responses of a batch adsorption system, by using mathematical models on the adsorber scale and adsorbent particle scale. As a result, the procedure for designing the NFR experiments has been established. In the second part, the theoretical FRFs up to the second-order for nonisothermal macropore diffusion (NMD) model, as one of the common mechanisms of gas-solid adsorption, have been derived and analyzed. As a result, the methodology for estimation of the parameters of NMD model, based on the characteristics of the FRFs, was established. In order to validate the NFR method experimentally, a new experimental set-up was designed and constructed. The working principle of the apparatus is modulation of the volume of the closed cell in a sinusiodal way, with variable amplitude and frequency, and measuring the pressure, adsorbent temperature and gas temperature responses. The test system was CO2/ zeolite 5A particles. The results showed that the NFR method can be applied for identification of the kinetic mechanism and estimation of equilibrium and kinetic data. It was also shown, that it is advantageous compared to the linear FR method in terms of reliability of identification of the kinetic model based on the second-order FRF, as well as in the possibility to estimate both kinetic and equilibrium data. Since this work represents the first evidence of experimental application of the NFR method for investigation of gas adsorption, it opens significant new perspectives in this field., Razumevanje složenih kinetičkih mehanizama adsorpcije gas-čvrsto predstavlja izazov u savremenom istraživanju. Klasična Frekventna metoda, koja se uobičajeno koristi za ispitivanje kinetike adsorpcije, analizira frekventni odziv sistema u linearnoj oblasti i zato ne može u potpunosti da okarakteriše kinetiku nelinearnih procesa adsorpcije. U okviru ove disertacije ispitivana je primenljivost metode Nelinearnog Frekventnog Odziva (NFO) za karakterizaciju kinetike i ravnoteže adsorpcije gas-čvrsto. Metoda NFO se zasniva na analiziranju frekventnog odziva sistema na ulaznu pobudu relativno velike amplitude i određivanju frekventnih prenosnih funkcija (FPF) višeg reda, uz korišćenje Volterra redova i generalizovane Furijeove transformacije. Primenljivost metode NFO za karakterizaciju kinetike i ravnoteže adsorpcije čistih gasova je ispitivana teorijski i eksperimentalno u zatvorenom (šaržnom) sistemu. Ključno pitanje u pogledu primenljivosti metode NFO je mogućnost određivanja frekventne prenosne funkcije drugog reda na nivou čestice adsorbensa. Teorijsko istraživanje se sastoji od dva dela. Prvi deo se zasniva na numeričkim simulacijama dinamičkih odziva šaržnog adsorbera, uz korišćenje matematičkih modela na nivou adsorbera i na nivou čestice adsorbensa. Na osnovu dobijenih rezultata ustanovljena je procedura za planiranje nelinearnih frekventnih eksperimenata. U drugom delu, izvedene su i analizirane FPF prvog i drugog reda za model neizotermne diffuzije kroz makropore, koji je jedan od čestih mehanizama adsorpcije gasova. Na osnovu rezultata ustanovljena je procedura za određivanje parametara pomenutog modela na osnovu karakteristika FPF. Da bi se metoda eksperimentalno potvrdila, projektovan je i izgrađen novi eksperimentalni sistem. Princip rada ovog sistema je promena zapremine sistema po sinusnom zakonu, sa promenljivom amplitudom i frekvencijom, i merenje odziva pritiska gasa, temperature adsorbensa i temperature gasa. Kao test sistem za eksperimente korišćen je adsorpcioni sistem CO2/ zeolit 5A. Rezultati su pokazali da je moguće primeniti metodu NFO za utvrđivanje kinetičkog mehanizma adsorpcije gasova kao i za određivanje kinetičkih i ravnotežnih parametara. Takođe je pokazano da metoda NFO ima značajne prednosti u odnosu na klasičnu (linearnu) frekventnu metodu, i to u pogledu pouzdanosti utvrđivanja kinetičkog mehanizma na osnovu oblika FPF drugog reda kao i u pogledu mogućnosti određivanja i kinetičkih i ravnotežnih podataka iz istih eksperimentalnih podataka. U ovom radu je prvi put eksperimentalno potvrđena mogućnost ispitivanja adsorpcije gasčvrsto korišćenjem metode NFO, čime se otvaraju značajne nove perspektive u toj oblasti.",
publisher = "Univerzitet u Beogradu, Tehnološko-metalurški fakultet",
title = "Application of nonlinear frequency response method for investigation of equlibrium and kinetics of gas-solid adsorption, Primena nelinearne frekventne metode na ispitivanje ravnoteže i kinetike adsorpcionih sistema gas-čvrsto",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4636"
}

Brzić, D.. (2016). Application of nonlinear frequency response method for investigation of equlibrium and kinetics of gas-solid adsorption. 
Univerzitet u Beogradu, Tehnološko-metalurški fakultet..
https://hdl.handle.net/21.15107/rcub_technorep_4636

Brzić D. Application of nonlinear frequency response method for investigation of equlibrium and kinetics of gas-solid adsorption. 2016;.
https://hdl.handle.net/21.15107/rcub_technorep_4636 .

Brzić, Danica, "Application of nonlinear frequency response method for investigation of equlibrium and kinetics of gas-solid adsorption" (2016),
https://hdl.handle.net/21.15107/rcub_technorep_4636 .

TY  - JOUR
AU  - Brzić, Danica
AU  - Petkovska, Menka
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2986
AB  - A new apparatus for experimental validation of the Nonlinear Frequency Response (NFR) method for investigation of gas adsorption is presented. The apparatus has been designed as a batch adsorber with sinusoidal modulation of the volume, with an amplitude that can be varied. Fast and accurate measurements of pressure, gas temperature and particle temperature responses are employed. The measurement routine and data analysis are demonstrated by CO2 adsorption on zeolite 5A particles of two different diameters. The responses for input amplitudes of 3% and 7% of the volume change are measured. The concept of blank FRFs is introduced as a new way to incorporate the results of blank experiments for elimination of spurious effects. The first- and second order FRFs which relate the adsorbed quantity to the pressure (F-1(omega) and F-2(omega,omega)) are calculated based on the measured pressure responses. The first order FRF which relates the particle temperature to the pressure (H-1(omega)) is calculated from the particle temperature responses. The characteristics of F-1(omega), F-2(omega,omega) and H-1(omega) for spherical beads of 1.7 mm agree with the corresponding theoretical ones for nonisothermal macropore diffusion model. The equilibrium and kinetic parameters are estimated from these functions. The results of this study confirm the applicability of NFR method for characterization of gas adsorption and show significance of the extension of analysis to the nonlinear range.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Chemical Engineering Science
T1  - Nonlinear Frequency Response measurements of gas adsorption equilibrium and kinetics: New apparatus and experimental verification
EP  - 21
SP  - 9
VL  - 132
DO  - 10.1016/j.ces.2015.04.007
ER  - 

@article{
author = "Brzić, Danica and Petkovska, Menka",
year = "2015",
abstract = "A new apparatus for experimental validation of the Nonlinear Frequency Response (NFR) method for investigation of gas adsorption is presented. The apparatus has been designed as a batch adsorber with sinusoidal modulation of the volume, with an amplitude that can be varied. Fast and accurate measurements of pressure, gas temperature and particle temperature responses are employed. The measurement routine and data analysis are demonstrated by CO2 adsorption on zeolite 5A particles of two different diameters. The responses for input amplitudes of 3% and 7% of the volume change are measured. The concept of blank FRFs is introduced as a new way to incorporate the results of blank experiments for elimination of spurious effects. The first- and second order FRFs which relate the adsorbed quantity to the pressure (F-1(omega) and F-2(omega,omega)) are calculated based on the measured pressure responses. The first order FRF which relates the particle temperature to the pressure (H-1(omega)) is calculated from the particle temperature responses. The characteristics of F-1(omega), F-2(omega,omega) and H-1(omega) for spherical beads of 1.7 mm agree with the corresponding theoretical ones for nonisothermal macropore diffusion model. The equilibrium and kinetic parameters are estimated from these functions. The results of this study confirm the applicability of NFR method for characterization of gas adsorption and show significance of the extension of analysis to the nonlinear range.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Chemical Engineering Science",
title = "Nonlinear Frequency Response measurements of gas adsorption equilibrium and kinetics: New apparatus and experimental verification",
pages = "21-9",
volume = "132",
doi = "10.1016/j.ces.2015.04.007"
}

Brzić, D.,& Petkovska, M.. (2015). Nonlinear Frequency Response measurements of gas adsorption equilibrium and kinetics: New apparatus and experimental verification. in Chemical Engineering Science
Pergamon-Elsevier Science Ltd, Oxford., 132, 9-21.
https://doi.org/10.1016/j.ces.2015.04.007

Brzić D, Petkovska M. Nonlinear Frequency Response measurements of gas adsorption equilibrium and kinetics: New apparatus and experimental verification. in Chemical Engineering Science. 2015;132:9-21.
doi:10.1016/j.ces.2015.04.007 .

Brzić, Danica, Petkovska, Menka, "Nonlinear Frequency Response measurements of gas adsorption equilibrium and kinetics: New apparatus and experimental verification" in Chemical Engineering Science, 132 (2015):9-21,
https://doi.org/10.1016/j.ces.2015.04.007 . .

TY  - JOUR
AU  - Brzić, Danica
AU  - Petkovska, Menka
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2659
AB  - In this work, a nonlinear frequency response (NFR) approach is used for a theoretical study of nonisothermal adsorption controlled by macropore diffusion (NMD). Based on the nonlinear mathematical model on the particle scale for spherical geometry, the theoretical frequency response functions (FRFs) up to the second order have been derived, using the concept of higher-order FRFs. The FRFs for isothermal macropore diffusion model have also been derived for comparison. For the NMD model two series of FRFs define the process: one which relates the sorbate concentration in the particle to the pressure (F) and the other which relates the particle temperature to the pressure (Z). The obtained FRFs were simulated for seven different sets of parameters. The second-order F function exhibits specific bimodal pattern, which enables separation of the diffusional and heat-transfer time constant. The high-frequency asymptotic features of the second-order F function discriminates the NMD mechanism from micropore-macropore diffusion control. Based on the characteristic of the first- and second-order F and Z functions, the new procedure for direct estimation of the diffusional and heat-transfer time constants is proposed. Additionally, some equilibrium parameters, as well as the heat of adsorption, can also be estimated. The NFR approach shows significant advantages regarding analysis of NMD compared to the linear FR method.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Chemical Engineering Science
T1  - Nonlinear frequency response analysis of nonisothermal adsorption controlled by macropore diffusion
EP  - 153
SP  - 141
VL  - 118
DO  - 10.1016/j.ces.2014.07.033
ER  - 

@article{
author = "Brzić, Danica and Petkovska, Menka",
year = "2014",
abstract = "In this work, a nonlinear frequency response (NFR) approach is used for a theoretical study of nonisothermal adsorption controlled by macropore diffusion (NMD). Based on the nonlinear mathematical model on the particle scale for spherical geometry, the theoretical frequency response functions (FRFs) up to the second order have been derived, using the concept of higher-order FRFs. The FRFs for isothermal macropore diffusion model have also been derived for comparison. For the NMD model two series of FRFs define the process: one which relates the sorbate concentration in the particle to the pressure (F) and the other which relates the particle temperature to the pressure (Z). The obtained FRFs were simulated for seven different sets of parameters. The second-order F function exhibits specific bimodal pattern, which enables separation of the diffusional and heat-transfer time constant. The high-frequency asymptotic features of the second-order F function discriminates the NMD mechanism from micropore-macropore diffusion control. Based on the characteristic of the first- and second-order F and Z functions, the new procedure for direct estimation of the diffusional and heat-transfer time constants is proposed. Additionally, some equilibrium parameters, as well as the heat of adsorption, can also be estimated. The NFR approach shows significant advantages regarding analysis of NMD compared to the linear FR method.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Chemical Engineering Science",
title = "Nonlinear frequency response analysis of nonisothermal adsorption controlled by macropore diffusion",
pages = "153-141",
volume = "118",
doi = "10.1016/j.ces.2014.07.033"
}

Brzić, D.,& Petkovska, M.. (2014). Nonlinear frequency response analysis of nonisothermal adsorption controlled by macropore diffusion. in Chemical Engineering Science
Pergamon-Elsevier Science Ltd, Oxford., 118, 141-153.
https://doi.org/10.1016/j.ces.2014.07.033

Brzić D, Petkovska M. Nonlinear frequency response analysis of nonisothermal adsorption controlled by macropore diffusion. in Chemical Engineering Science. 2014;118:141-153.
doi:10.1016/j.ces.2014.07.033 .

Brzić, Danica, Petkovska, Menka, "Nonlinear frequency response analysis of nonisothermal adsorption controlled by macropore diffusion" in Chemical Engineering Science, 118 (2014):141-153,
https://doi.org/10.1016/j.ces.2014.07.033 . .

TY  - JOUR
AU  - Brzić, Danica
AU  - Petkovska, Menka
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2437
AB  - A study of the applicability of the Nonlinear Frequency Response (NFR) approach for investigation of equilibrium and kinetics of gas adsorption, based on numerical simulations, is presented. Pressure responses of a batch adsorber are simulated, using literature data, for a sinusoidal volume change with different input amplitudes, up to 10%, around several steady-state points. The procedure for application of the NFR approach is demonstrated step-by-step, using the simulated pressure responses. As a result, quasi-experimental first- and second-order FRFs are estimated and used for estimation of the equilibrium and kinetic parameters of the adsorption system. The estimated parameters agree well with the original ones used for simulations. Influence of noise on the accuracy of the estimated FRFs and model parameters is also analyzed. The results of this study show that the application of the NFR approach for investigation of equilibrium and kinetics of gas adsorption in a batch system is feasible. Furthermore, valuable information regarding the design of the NFR equipment and experiments is gained.
PB  - Amer Chemical Soc, Washington
T2  - Industrial & Engineering Chemistry Research
T1  - A Study of Applicability of Nonlinear Frequency Response Method for Investigation of Gas Adsorption Based on Numerical Experiments
EP  - 16351
IS  - 46
SP  - 16341
VL  - 52
DO  - 10.1021/ie402269h
ER  - 

@article{
author = "Brzić, Danica and Petkovska, Menka",
year = "2013",
abstract = "A study of the applicability of the Nonlinear Frequency Response (NFR) approach for investigation of equilibrium and kinetics of gas adsorption, based on numerical simulations, is presented. Pressure responses of a batch adsorber are simulated, using literature data, for a sinusoidal volume change with different input amplitudes, up to 10%, around several steady-state points. The procedure for application of the NFR approach is demonstrated step-by-step, using the simulated pressure responses. As a result, quasi-experimental first- and second-order FRFs are estimated and used for estimation of the equilibrium and kinetic parameters of the adsorption system. The estimated parameters agree well with the original ones used for simulations. Influence of noise on the accuracy of the estimated FRFs and model parameters is also analyzed. The results of this study show that the application of the NFR approach for investigation of equilibrium and kinetics of gas adsorption in a batch system is feasible. Furthermore, valuable information regarding the design of the NFR equipment and experiments is gained.",
publisher = "Amer Chemical Soc, Washington",
journal = "Industrial & Engineering Chemistry Research",
title = "A Study of Applicability of Nonlinear Frequency Response Method for Investigation of Gas Adsorption Based on Numerical Experiments",
pages = "16351-16341",
number = "46",
volume = "52",
doi = "10.1021/ie402269h"
}

Brzić, D.,& Petkovska, M.. (2013). A Study of Applicability of Nonlinear Frequency Response Method for Investigation of Gas Adsorption Based on Numerical Experiments. in Industrial & Engineering Chemistry Research
Amer Chemical Soc, Washington., 52(46), 16341-16351.
https://doi.org/10.1021/ie402269h

Brzić D, Petkovska M. A Study of Applicability of Nonlinear Frequency Response Method for Investigation of Gas Adsorption Based on Numerical Experiments. in Industrial & Engineering Chemistry Research. 2013;52(46):16341-16351.
doi:10.1021/ie402269h .

Brzić, Danica, Petkovska, Menka, "A Study of Applicability of Nonlinear Frequency Response Method for Investigation of Gas Adsorption Based on Numerical Experiments" in Industrial & Engineering Chemistry Research, 52, no. 46 (2013):16341-16351,
https://doi.org/10.1021/ie402269h . .

TY  - JOUR
AU  - Brzić, Danica
AU  - Petkovska, Menka
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2171
AB  - Some practical aspects regarding application of the nonlinear frequency response (NFR) method for investigation of gas adsorption: choice of the optimal mass of the adsorbent, frequency range and input amplitude, are studied theoretically. For successful application of the NFR method, reliable experimental determination of the second-order frequency response function (FRF) is essential. In order to analyse the influence of the mass of the adsorbent, the frequency range and the input amplitude on the accuracy of the estimated the second-order FRF, frequency responses (FRs) of a batch adsorber with volume modulation are simulated and used for calculation of the second-order FRF. Furthermore, the procedure for estimation of the optimal mass of the adsorbent, required frequency range and input amplitude, based on simple preliminary step responses, is proposed. In order to demonstrate the procedure, responses of the batch adsorber for the step volume change are also simulated. The proposed procedure enables establishment of the efficient experimental plan for application of the NFR method.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Chemical Engineering Science
T1  - Some practical aspects of nonlinear frequency response method for investigation of adsorption equilibrium and kinetics
EP  - 72
SP  - 62
VL  - 82
DO  - 10.1016/j.ces.2012.07.013
ER  - 

@article{
author = "Brzić, Danica and Petkovska, Menka",
year = "2012",
abstract = "Some practical aspects regarding application of the nonlinear frequency response (NFR) method for investigation of gas adsorption: choice of the optimal mass of the adsorbent, frequency range and input amplitude, are studied theoretically. For successful application of the NFR method, reliable experimental determination of the second-order frequency response function (FRF) is essential. In order to analyse the influence of the mass of the adsorbent, the frequency range and the input amplitude on the accuracy of the estimated the second-order FRF, frequency responses (FRs) of a batch adsorber with volume modulation are simulated and used for calculation of the second-order FRF. Furthermore, the procedure for estimation of the optimal mass of the adsorbent, required frequency range and input amplitude, based on simple preliminary step responses, is proposed. In order to demonstrate the procedure, responses of the batch adsorber for the step volume change are also simulated. The proposed procedure enables establishment of the efficient experimental plan for application of the NFR method.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Chemical Engineering Science",
title = "Some practical aspects of nonlinear frequency response method for investigation of adsorption equilibrium and kinetics",
pages = "72-62",
volume = "82",
doi = "10.1016/j.ces.2012.07.013"
}

Brzić, D.,& Petkovska, M.. (2012). Some practical aspects of nonlinear frequency response method for investigation of adsorption equilibrium and kinetics. in Chemical Engineering Science
Pergamon-Elsevier Science Ltd, Oxford., 82, 62-72.
https://doi.org/10.1016/j.ces.2012.07.013

Brzić D, Petkovska M. Some practical aspects of nonlinear frequency response method for investigation of adsorption equilibrium and kinetics. in Chemical Engineering Science. 2012;82:62-72.
doi:10.1016/j.ces.2012.07.013 .

Brzić, Danica, Petkovska, Menka, "Some practical aspects of nonlinear frequency response method for investigation of adsorption equilibrium and kinetics" in Chemical Engineering Science, 82 (2012):62-72,
https://doi.org/10.1016/j.ces.2012.07.013 . .

TY  - JOUR
AU  - Brzić, Danica
AU  - Schubert, M.
AU  - Haering, H.
AU  - Lange, R.
AU  - Petkovska, Menka
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1613
AB  - In this paper, we propose a new procedure for fast evaluation of the potential of periodic operations in trickle-bed reactors, based on empirical modeling. Step response experiments, with different input amplitudes, were performed on a laboratory trickle-bed reactor, in order to derive a simple nonlinear dynamic model. a-methylstyrene (AMS) hydrogenation was used as a test reaction and the feed AMS concentration was used as the modulated input. An empirical nonlinear model was postulated and used for simulation of periodic operations. The simulation of a periodic operation with sinusoidal modulation of the inlet AMS concentration with 40 % amplitude resulted up to 35% higher time-averaged conversion than the corresponding steady-state one.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Chemical Engineering Science
T1  - Evaluation of periodic operation of a trickle-bed reactor based on empirical modeling
EP  - 4165
IS  - 14
SP  - 4160
VL  - 65
DO  - 10.1016/j.ces.2010.04.032
ER  - 

@article{
author = "Brzić, Danica and Schubert, M. and Haering, H. and Lange, R. and Petkovska, Menka",
year = "2010",
abstract = "In this paper, we propose a new procedure for fast evaluation of the potential of periodic operations in trickle-bed reactors, based on empirical modeling. Step response experiments, with different input amplitudes, were performed on a laboratory trickle-bed reactor, in order to derive a simple nonlinear dynamic model. a-methylstyrene (AMS) hydrogenation was used as a test reaction and the feed AMS concentration was used as the modulated input. An empirical nonlinear model was postulated and used for simulation of periodic operations. The simulation of a periodic operation with sinusoidal modulation of the inlet AMS concentration with 40 % amplitude resulted up to 35% higher time-averaged conversion than the corresponding steady-state one.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Chemical Engineering Science",
title = "Evaluation of periodic operation of a trickle-bed reactor based on empirical modeling",
pages = "4165-4160",
number = "14",
volume = "65",
doi = "10.1016/j.ces.2010.04.032"
}

Brzić, D., Schubert, M., Haering, H., Lange, R.,& Petkovska, M.. (2010). Evaluation of periodic operation of a trickle-bed reactor based on empirical modeling. in Chemical Engineering Science
Pergamon-Elsevier Science Ltd, Oxford., 65(14), 4160-4165.
https://doi.org/10.1016/j.ces.2010.04.032

Brzić D, Schubert M, Haering H, Lange R, Petkovska M. Evaluation of periodic operation of a trickle-bed reactor based on empirical modeling. in Chemical Engineering Science. 2010;65(14):4160-4165.
doi:10.1016/j.ces.2010.04.032 .

Brzić, Danica, Schubert, M., Haering, H., Lange, R., Petkovska, Menka, "Evaluation of periodic operation of a trickle-bed reactor based on empirical modeling" in Chemical Engineering Science, 65, no. 14 (2010):4160-4165,
https://doi.org/10.1016/j.ces.2010.04.032 . .

TY  - JOUR
AU  - Brzić, Danica
AU  - Ahchieva, Desislava
AU  - Peglow, Mirko
AU  - Heinrich, Stefan
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1081
AB  - The partial catalytic oxidation of ethane to ethylene was investigated experimentally in a shallow fluidized bed. The performances of two catalyst types, pure γ-Al2O3 and V2O5/γ-Al2O3 particles 1.8 mm in diameter, were analyzed. A pilot fluidized bed reactor with rectangular cross-section of 100mmx100mm was used. The experiments were carried out under atmospheric pressure in a dilute system under oxygen excess conditions. V2O5/γ-Al2O3 showed good catalytic performances regarding ethylene selectivity. The influence of the temperature (in the range of 400-600°C) and the contact time (in the range of 35-85 kg s m-3) on the conversion of ethane and the selectivity to ethylene was analyzed. The highest yield of ethylene was 18%.
AB  - U ovom radu eksperimentalno je ispitivana parcijalna katalitička oksidacija etana do etilena u reaktoru sa plitkim fluidizovanim slojem (visina sloja manja od prečnika reaktora). Kao čestice katalizatora korišćene su čestice čistog γ-Al2O3 kao i V2O5/γ-Al 2O3 prečnika 1.8 mm i upoređena su njihova svojstva u pogledu aktivnosti i selektivnosti ka etilenu. Reakcija je ispitivana u reaktoru kvadratnog poprečnog preseka 100 mmx100 mm pod atmosferskim pritiskom, u razblaženom sistemu u uslovima viška kiseonika. V 2O5/γ-Al 2O3 je pokazao dobra katalitička svojstva u smislu visoke selektivnosti ka etilenu. Analizirani su uticaji temperature (u opsegu 400-600°C) i vremena kontakta (u opsegu 35-85 kg s m-3) na konverziju etana i selektivnost ka etilenu. Maksimalni ostvareni prinos etilena je 18 %.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - An experimental study of the partial oxidation of ethane to ethylene in a shallow fluidized bed reactor
T1  - Eksperimentalno ispitivanje parcijalne oksidacije etana do etilena u reaktoru sa plitkim fludizovanim slojem
EP  - 192
IS  - 2
SP  - 183
VL  - 72
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1081
ER  - 

@article{
author = "Brzić, Danica and Ahchieva, Desislava and Peglow, Mirko and Heinrich, Stefan",
year = "2007",
abstract = "The partial catalytic oxidation of ethane to ethylene was investigated experimentally in a shallow fluidized bed. The performances of two catalyst types, pure γ-Al2O3 and V2O5/γ-Al2O3 particles 1.8 mm in diameter, were analyzed. A pilot fluidized bed reactor with rectangular cross-section of 100mmx100mm was used. The experiments were carried out under atmospheric pressure in a dilute system under oxygen excess conditions. V2O5/γ-Al2O3 showed good catalytic performances regarding ethylene selectivity. The influence of the temperature (in the range of 400-600°C) and the contact time (in the range of 35-85 kg s m-3) on the conversion of ethane and the selectivity to ethylene was analyzed. The highest yield of ethylene was 18%., U ovom radu eksperimentalno je ispitivana parcijalna katalitička oksidacija etana do etilena u reaktoru sa plitkim fluidizovanim slojem (visina sloja manja od prečnika reaktora). Kao čestice katalizatora korišćene su čestice čistog γ-Al2O3 kao i V2O5/γ-Al 2O3 prečnika 1.8 mm i upoređena su njihova svojstva u pogledu aktivnosti i selektivnosti ka etilenu. Reakcija je ispitivana u reaktoru kvadratnog poprečnog preseka 100 mmx100 mm pod atmosferskim pritiskom, u razblaženom sistemu u uslovima viška kiseonika. V 2O5/γ-Al 2O3 je pokazao dobra katalitička svojstva u smislu visoke selektivnosti ka etilenu. Analizirani su uticaji temperature (u opsegu 400-600°C) i vremena kontakta (u opsegu 35-85 kg s m-3) na konverziju etana i selektivnost ka etilenu. Maksimalni ostvareni prinos etilena je 18 %.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "An experimental study of the partial oxidation of ethane to ethylene in a shallow fluidized bed reactor, Eksperimentalno ispitivanje parcijalne oksidacije etana do etilena u reaktoru sa plitkim fludizovanim slojem",
pages = "192-183",
number = "2",
volume = "72",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1081"
}

Brzić, D., Ahchieva, D., Peglow, M.,& Heinrich, S.. (2007). An experimental study of the partial oxidation of ethane to ethylene in a shallow fluidized bed reactor. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 72(2), 183-192.
https://hdl.handle.net/21.15107/rcub_technorep_1081

Brzić D, Ahchieva D, Peglow M, Heinrich S. An experimental study of the partial oxidation of ethane to ethylene in a shallow fluidized bed reactor. in Journal of the Serbian Chemical Society. 2007;72(2):183-192.
https://hdl.handle.net/21.15107/rcub_technorep_1081 .

Brzić, Danica, Ahchieva, Desislava, Peglow, Mirko, Heinrich, Stefan, "An experimental study of the partial oxidation of ethane to ethylene in a shallow fluidized bed reactor" in Journal of the Serbian Chemical Society, 72, no. 2 (2007):183-192,
https://hdl.handle.net/21.15107/rcub_technorep_1081 .

TY  - JOUR
AU  - Brzić, Danica
AU  - Ahchieva, Desislava
AU  - Piskova, E
AU  - Heinrich, Stefan
AU  - Grbavčić, Željko
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/839
AB  - The aim of the present study is experimental investigation of hydrodynamics of shallow fluidized bed of coarse particles. Air was fluidizing fluid. gamma-Al2O3 particles of 1 mm and 1.8 mm in diameter and density of 1080 kg m(-3) (both Geldart D) were used. Experiments were carried out in a column with rectangular cross-section area of 100 mm x 100 mm, at temperatures of 20 degrees C and 500 degrees C. Measurements of absolute and differential pressure fluctuations were employed. Standard deviation and amplitude spectra analysis were used to determine fluidization regimes. In the range of superficial velocities 0-4.5 in s(-1), three different regimes were found: single bubble regime, rapidly growing bubble regime and turbulent fluidization. General qualitative characteristics of those regimes regarding bed structure were ascertained. Transition velocities between regimes were experimentally determined and compared with literature correlations. A new correlation for prediction the velocity at the beginning of turbulent fluidization in the coarse particle systems was proposed as follows: Re-c = 0.326Ar(0.52).
PB  - Elsevier Science Sa, Lausanne
T2  - Chemical Engineering Journal
T1  - Hydrodynamics of shallow fluidized bed of coarse particles
EP  - 54
IS  - 1-3
SP  - 47
VL  - 114
DO  - 10.1016/j.cej.2005.09.002
ER  - 

@article{
author = "Brzić, Danica and Ahchieva, Desislava and Piskova, E and Heinrich, Stefan and Grbavčić, Željko",
year = "2005",
abstract = "The aim of the present study is experimental investigation of hydrodynamics of shallow fluidized bed of coarse particles. Air was fluidizing fluid. gamma-Al2O3 particles of 1 mm and 1.8 mm in diameter and density of 1080 kg m(-3) (both Geldart D) were used. Experiments were carried out in a column with rectangular cross-section area of 100 mm x 100 mm, at temperatures of 20 degrees C and 500 degrees C. Measurements of absolute and differential pressure fluctuations were employed. Standard deviation and amplitude spectra analysis were used to determine fluidization regimes. In the range of superficial velocities 0-4.5 in s(-1), three different regimes were found: single bubble regime, rapidly growing bubble regime and turbulent fluidization. General qualitative characteristics of those regimes regarding bed structure were ascertained. Transition velocities between regimes were experimentally determined and compared with literature correlations. A new correlation for prediction the velocity at the beginning of turbulent fluidization in the coarse particle systems was proposed as follows: Re-c = 0.326Ar(0.52).",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Chemical Engineering Journal",
title = "Hydrodynamics of shallow fluidized bed of coarse particles",
pages = "54-47",
number = "1-3",
volume = "114",
doi = "10.1016/j.cej.2005.09.002"
}

Brzić, D., Ahchieva, D., Piskova, E., Heinrich, S.,& Grbavčić, Ž.. (2005). Hydrodynamics of shallow fluidized bed of coarse particles. in Chemical Engineering Journal
Elsevier Science Sa, Lausanne., 114(1-3), 47-54.
https://doi.org/10.1016/j.cej.2005.09.002

Brzić D, Ahchieva D, Piskova E, Heinrich S, Grbavčić Ž. Hydrodynamics of shallow fluidized bed of coarse particles. in Chemical Engineering Journal. 2005;114(1-3):47-54.
doi:10.1016/j.cej.2005.09.002 .

Brzić, Danica, Ahchieva, Desislava, Piskova, E, Heinrich, Stefan, Grbavčić, Željko, "Hydrodynamics of shallow fluidized bed of coarse particles" in Chemical Engineering Journal, 114, no. 1-3 (2005):47-54,
https://doi.org/10.1016/j.cej.2005.09.002 . .

TY  - JOUR
AU  - Bošković-Vragolović, Nevenka
AU  - Brzić, Danica
AU  - Grbavčić, Željko
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/794
AB  - The mass transfer coefficient between fluid and an immersed sphere in liquid packed and fluidized beds of inert spherical particles have been studied experimentally using a column 40 mm in diameter. The mass transfer data were obtained by studying the transfer of benzoic acid from the immersed sphere to flowing water using the dissolution method. In all runs, the mass transfer rates were determined in the presence of inert glass particles 0.50-2.98 mm in diameter. The influence of different parameters, such as: liquid velocity, particles size and bed void age, on the mass transfer in packed and fluidized beds is presented. The obtained experimental data for mass transfer in the packed and particulate fluidized bed were correlated by a single correlation, thus confirming the similarity between the two systems.
AB  - U ovom radu je eksperimentalno ispitivan prelaz mase između uronjene sfere i fluida u prisustvu pakovanih i fluidizovanih čestica. Za određivanje koeficijenta prelaza mase korišćena je metoda praćenja rastvaranja slabo rastvorne supstance- benzoeve kiseline u vodi. Korišćena je kolona prečnika 40 mm, uronjena sfera prečnika 21 mm, a pakovane i fluidizovane slojeve su činile staklene sfere prečnika 0,5-2,98 mm. Ispitivanja u pakovanim slojevima izvršena su u sistemima sa različitim pakovanjima - retkom i gustom. Prikazani su uticaji različitih parametara, kao što su brzina fluida, veličina čestica i poroznost slojeva na koeficijent prelaza mase. Pokazane su razlike i sličnosti u prenosu mase kada su u sloju prisutne nepokretne i fluidizovane čestice. Data je završna eksperimentalna korelacija koja je zajednička i za pakovane i za fluidizovane slojeve. Korelacija je data kao veza bezdimenzionih grupa Rep/(1-ε)i jDε koje nisu tipične za korelisanje podataka u fludizovanim slojevima. Ova korelacija ukazuje da postoji sličnost mehanizama prenosa mase u pakovanim i partikulativno fludizovanim slojevima.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Mass transfer between a fluid and an immersed object in liquid-solid packed and fluidized beds
T1  - Prenos mase fluid-uronjeni objekat u pakovanim i fluidizovanim slojevima tečnost-čestice
EP  - 1379
IS  - 11
SP  - 1373
VL  - 70
UR  - https://hdl.handle.net/21.15107/rcub_technorep_794
ER  - 

@article{
author = "Bošković-Vragolović, Nevenka and Brzić, Danica and Grbavčić, Željko",
year = "2005",
abstract = "The mass transfer coefficient between fluid and an immersed sphere in liquid packed and fluidized beds of inert spherical particles have been studied experimentally using a column 40 mm in diameter. The mass transfer data were obtained by studying the transfer of benzoic acid from the immersed sphere to flowing water using the dissolution method. In all runs, the mass transfer rates were determined in the presence of inert glass particles 0.50-2.98 mm in diameter. The influence of different parameters, such as: liquid velocity, particles size and bed void age, on the mass transfer in packed and fluidized beds is presented. The obtained experimental data for mass transfer in the packed and particulate fluidized bed were correlated by a single correlation, thus confirming the similarity between the two systems., U ovom radu je eksperimentalno ispitivan prelaz mase između uronjene sfere i fluida u prisustvu pakovanih i fluidizovanih čestica. Za određivanje koeficijenta prelaza mase korišćena je metoda praćenja rastvaranja slabo rastvorne supstance- benzoeve kiseline u vodi. Korišćena je kolona prečnika 40 mm, uronjena sfera prečnika 21 mm, a pakovane i fluidizovane slojeve su činile staklene sfere prečnika 0,5-2,98 mm. Ispitivanja u pakovanim slojevima izvršena su u sistemima sa različitim pakovanjima - retkom i gustom. Prikazani su uticaji različitih parametara, kao što su brzina fluida, veličina čestica i poroznost slojeva na koeficijent prelaza mase. Pokazane su razlike i sličnosti u prenosu mase kada su u sloju prisutne nepokretne i fluidizovane čestice. Data je završna eksperimentalna korelacija koja je zajednička i za pakovane i za fluidizovane slojeve. Korelacija je data kao veza bezdimenzionih grupa Rep/(1-ε)i jDε koje nisu tipične za korelisanje podataka u fludizovanim slojevima. Ova korelacija ukazuje da postoji sličnost mehanizama prenosa mase u pakovanim i partikulativno fludizovanim slojevima.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Mass transfer between a fluid and an immersed object in liquid-solid packed and fluidized beds, Prenos mase fluid-uronjeni objekat u pakovanim i fluidizovanim slojevima tečnost-čestice",
pages = "1379-1373",
number = "11",
volume = "70",
url = "https://hdl.handle.net/21.15107/rcub_technorep_794"
}

Bošković-Vragolović, N., Brzić, D.,& Grbavčić, Ž.. (2005). Mass transfer between a fluid and an immersed object in liquid-solid packed and fluidized beds. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 70(11), 1373-1379.
https://hdl.handle.net/21.15107/rcub_technorep_794

Bošković-Vragolović N, Brzić D, Grbavčić Ž. Mass transfer between a fluid and an immersed object in liquid-solid packed and fluidized beds. in Journal of the Serbian Chemical Society. 2005;70(11):1373-1379.
https://hdl.handle.net/21.15107/rcub_technorep_794 .

Bošković-Vragolović, Nevenka, Brzić, Danica, Grbavčić, Željko, "Mass transfer between a fluid and an immersed object in liquid-solid packed and fluidized beds" in Journal of the Serbian Chemical Society, 70, no. 11 (2005):1373-1379,
https://hdl.handle.net/21.15107/rcub_technorep_794 .

TY  - JOUR
AU  - Brzić, Danica
AU  - Bošković-Vragolović, Nevenka
AU  - Grbavčić, Željko
PY  - 2004
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/622
AB  - Mass transfer in fluidized beds is an important operation for separation processes. Two effects can be achieved by using fluidized beds in mass transfer processes increasing interface area and relative movement between the phases. These effects are both desirable because they lead to greater process rates. This paper presents an experimental investigation regarding mass transfer from the wall of a column to the fluid in a fluidized bed of inert spherical particles. The experiments were conducted in column 40 mm in diameter with spherical particles 0,8-3 mm in diameter and water as one fluidizing fluid. The method of dissolution of benzoic acid was used to provide very low mass flux. The average wall-to-fluid mass transfer coefficients were determined for two systems: single-phase fluid flow and a fluidized bed of inert particles The measurements encompassed a Reynolds number range from 100-4000 for single-phase flow and 600-4000 in fluidized beds. The mass transfer coefficients for both systems were calculated from weight loss of benzoic acid. The effects of superficial liquid velocity and particle diameter on the mass transfer coefficient were investigated. It was found that mass transfer was more intensive in the fluidized bed in comparison with single phase flow. The best conditions for mass transfer were reached at a minimum fluidization velocity, when the mass transfer coefficient had the greatest value. The experimental data were correlated in the form: jd = f(Re), where jd is the dimensionless mass transfer factor and Re the Reynolds number.
AB  - Ispitivan je prenos mase sa zida kolone na fluid u fluidizovanom sloju inertnih sfernih čestica. Eksperimenti su izvršeni u fluidizacionoj koloni prečnika 40 mm, sa sfernim česticama od stakla prečnika 0,8-3 mm i vodom kao fluidizacionim medijumom. Određivan je koeficijent prelaza mase zid kolone-fluidizovani sloj metodom rastvaranja benzoeve kiseline. Ispitivan je uticaj brzine strujanja fluida i karakteristika čestica na koeficijent prelaza mase. Opseg ispitivanih Rejnoldsovih brojeva bio je za strujanje fluida bez čestica (jednofazni tok) od 100-4000, a u fluidizovanom sloju od 600-4000. Rezultati su prikazani kao zavisnosti bezdimenzionog faktora prenosa mase /d od Rejnoldsovog broja Re i Rejnoldsovog broja za česticu Rep. Na osnovu eksperimentalnih rezultata postavljena je korelacija za određivanje koeficijenta prelaza mase u obliku zavisnosti JD = f(Re).
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Mass transfer from the wall of a column to the fluid in a fluidized bed of inert spherical particles
T1  - Prenos mase zid-fluid u partikulativno fluidizovanim slojevima
EP  - 72
IS  - 2
SP  - 69
VL  - 58
DO  - 10.2298/HEMIND0402069B
ER  - 

@article{
author = "Brzić, Danica and Bošković-Vragolović, Nevenka and Grbavčić, Željko",
year = "2004",
abstract = "Mass transfer in fluidized beds is an important operation for separation processes. Two effects can be achieved by using fluidized beds in mass transfer processes increasing interface area and relative movement between the phases. These effects are both desirable because they lead to greater process rates. This paper presents an experimental investigation regarding mass transfer from the wall of a column to the fluid in a fluidized bed of inert spherical particles. The experiments were conducted in column 40 mm in diameter with spherical particles 0,8-3 mm in diameter and water as one fluidizing fluid. The method of dissolution of benzoic acid was used to provide very low mass flux. The average wall-to-fluid mass transfer coefficients were determined for two systems: single-phase fluid flow and a fluidized bed of inert particles The measurements encompassed a Reynolds number range from 100-4000 for single-phase flow and 600-4000 in fluidized beds. The mass transfer coefficients for both systems were calculated from weight loss of benzoic acid. The effects of superficial liquid velocity and particle diameter on the mass transfer coefficient were investigated. It was found that mass transfer was more intensive in the fluidized bed in comparison with single phase flow. The best conditions for mass transfer were reached at a minimum fluidization velocity, when the mass transfer coefficient had the greatest value. The experimental data were correlated in the form: jd = f(Re), where jd is the dimensionless mass transfer factor and Re the Reynolds number., Ispitivan je prenos mase sa zida kolone na fluid u fluidizovanom sloju inertnih sfernih čestica. Eksperimenti su izvršeni u fluidizacionoj koloni prečnika 40 mm, sa sfernim česticama od stakla prečnika 0,8-3 mm i vodom kao fluidizacionim medijumom. Određivan je koeficijent prelaza mase zid kolone-fluidizovani sloj metodom rastvaranja benzoeve kiseline. Ispitivan je uticaj brzine strujanja fluida i karakteristika čestica na koeficijent prelaza mase. Opseg ispitivanih Rejnoldsovih brojeva bio je za strujanje fluida bez čestica (jednofazni tok) od 100-4000, a u fluidizovanom sloju od 600-4000. Rezultati su prikazani kao zavisnosti bezdimenzionog faktora prenosa mase /d od Rejnoldsovog broja Re i Rejnoldsovog broja za česticu Rep. Na osnovu eksperimentalnih rezultata postavljena je korelacija za određivanje koeficijenta prelaza mase u obliku zavisnosti JD = f(Re).",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Mass transfer from the wall of a column to the fluid in a fluidized bed of inert spherical particles, Prenos mase zid-fluid u partikulativno fluidizovanim slojevima",
pages = "72-69",
number = "2",
volume = "58",
doi = "10.2298/HEMIND0402069B"
}

Brzić, D., Bošković-Vragolović, N.,& Grbavčić, Ž.. (2004). Mass transfer from the wall of a column to the fluid in a fluidized bed of inert spherical particles. in Hemijska industrija
Association of Chemical Engineers of Serbia., 58(2), 69-72.
https://doi.org/10.2298/HEMIND0402069B

Brzić D, Bošković-Vragolović N, Grbavčić Ž. Mass transfer from the wall of a column to the fluid in a fluidized bed of inert spherical particles. in Hemijska industrija. 2004;58(2):69-72.
doi:10.2298/HEMIND0402069B .

Brzić, Danica, Bošković-Vragolović, Nevenka, Grbavčić, Željko, "Mass transfer from the wall of a column to the fluid in a fluidized bed of inert spherical particles" in Hemijska industrija, 58, no. 2 (2004):69-72,
https://doi.org/10.2298/HEMIND0402069B . .

TY  - JOUR
AU  - Ahchieva, D.
AU  - Brzić, Danica
AU  - Peglow, M.
AU  - Heinrich, S.
AU  - Mörl, L.
PY  - 2004
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5050
PB  - Wiley
T2  - Chemie-Ingenieur-Technik
T1  - Theoretical and experimental studies on the partial oxidation of ethane in the fluidized bed membrane reactor
T1  - Theoretische und experimentelle untersuchungen der partiellen oxidation von ethan im wirbelschicht-membranreaktor
EP  - 1296
IS  - 9
SP  - 1295
VL  - 76
DO  - https://doi.org/10.1002/cite.200490143
ER  - 

@article{
author = "Ahchieva, D. and Brzić, Danica and Peglow, M. and Heinrich, S. and Mörl, L.",
year = "2004",
publisher = "Wiley",
journal = "Chemie-Ingenieur-Technik",
title = "Theoretical and experimental studies on the partial oxidation of ethane in the fluidized bed membrane reactor, Theoretische und experimentelle untersuchungen der partiellen oxidation von ethan im wirbelschicht-membranreaktor",
pages = "1296-1295",
number = "9",
volume = "76",
doi = "https://doi.org/10.1002/cite.200490143"
}

Ahchieva, D., Brzić, D., Peglow, M., Heinrich, S.,& Mörl, L.. (2004). Theoretical and experimental studies on the partial oxidation of ethane in the fluidized bed membrane reactor. in Chemie-Ingenieur-Technik
Wiley., 76(9), 1295-1296.
https://doi.org/https://doi.org/10.1002/cite.200490143

Ahchieva D, Brzić D, Peglow M, Heinrich S, Mörl L. Theoretical and experimental studies on the partial oxidation of ethane in the fluidized bed membrane reactor. in Chemie-Ingenieur-Technik. 2004;76(9):1295-1296.
doi:https://doi.org/10.1002/cite.200490143 .

Ahchieva, D., Brzić, Danica, Peglow, M., Heinrich, S., Mörl, L., "Theoretical and experimental studies on the partial oxidation of ethane in the fluidized bed membrane reactor" in Chemie-Ingenieur-Technik, 76, no. 9 (2004):1295-1296,
https://doi.org/https://doi.org/10.1002/cite.200490143 . .