TY  - JOUR
AU  - Majstorović, Divna M.
AU  - Quindel, Patrick
AU  - Živković, Emila M.
AU  - Kabelac, Stephan
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6623
AB  - The speed of sound of four different nanofluids consisting of Ag or Al2O3 nanoparticles and water or ethylene glycol base fluid is measured in the temperature range (298.15–343.15) K and at atmospheric pressure. One aim of this analysis is to learn whether the change from pure base fluid speed of sound to the nanofluid situation is a smooth or disruptive transition when adding nanoparticles. The measurements were conducted on the newly proposed apparatus consisting mainly of function generator, ultrasonic sensor, switch, voltage source, oscilloscope, ultrasonic container and the necessary sensors and equipment for data acquisition. The values for speed of sound were calculated based on the Time of Flight method. Deionised water and ethanol were used to calibrate the apparatus which is additionally tested with pure base fluids water and ethylene glycol and showed excellent agreement with average absolute percentage deviations between experimental and literature data for speed of sound of 0.12% and 0.36%, respectively,. Beside the temperature influence, the influence of the nanoparticle concentration on the speed of sound of nanofluid were investigated and followed. The analysis of the sound velocity allows insight into the molecular level interactions taking place between the nanoparticles and the base fluid molecules of the nanofluid. The decrease in velocity values with the increase of concentration, noticeable in the tested nanofluids, is a result of decrease in nanoparticle-fluid interaction and dominance of particle–particle interaction.
PB  - Elsevier B.V.
T2  - Journal of Molecular Liquids
T1  - A new setup for speed of sound measurements and experimental data for nanofluids Al2O3 or Ag with water or ethylene glycol
SP  - 122930
VL  - 389
DO  - 10.1016/j.molliq.2023.122930
ER  - 

@article{
author = "Majstorović, Divna M. and Quindel, Patrick and Živković, Emila M. and Kabelac, Stephan",
year = "2023",
abstract = "The speed of sound of four different nanofluids consisting of Ag or Al2O3 nanoparticles and water or ethylene glycol base fluid is measured in the temperature range (298.15–343.15) K and at atmospheric pressure. One aim of this analysis is to learn whether the change from pure base fluid speed of sound to the nanofluid situation is a smooth or disruptive transition when adding nanoparticles. The measurements were conducted on the newly proposed apparatus consisting mainly of function generator, ultrasonic sensor, switch, voltage source, oscilloscope, ultrasonic container and the necessary sensors and equipment for data acquisition. The values for speed of sound were calculated based on the Time of Flight method. Deionised water and ethanol were used to calibrate the apparatus which is additionally tested with pure base fluids water and ethylene glycol and showed excellent agreement with average absolute percentage deviations between experimental and literature data for speed of sound of 0.12% and 0.36%, respectively,. Beside the temperature influence, the influence of the nanoparticle concentration on the speed of sound of nanofluid were investigated and followed. The analysis of the sound velocity allows insight into the molecular level interactions taking place between the nanoparticles and the base fluid molecules of the nanofluid. The decrease in velocity values with the increase of concentration, noticeable in the tested nanofluids, is a result of decrease in nanoparticle-fluid interaction and dominance of particle–particle interaction.",
publisher = "Elsevier B.V.",
journal = "Journal of Molecular Liquids",
title = "A new setup for speed of sound measurements and experimental data for nanofluids Al2O3 or Ag with water or ethylene glycol",
pages = "122930",
volume = "389",
doi = "10.1016/j.molliq.2023.122930"
}

Majstorović, D. M., Quindel, P., Živković, E. M.,& Kabelac, S.. (2023). A new setup for speed of sound measurements and experimental data for nanofluids Al2O3 or Ag with water or ethylene glycol. in Journal of Molecular Liquids
Elsevier B.V.., 389, 122930.
https://doi.org/10.1016/j.molliq.2023.122930

Majstorović DM, Quindel P, Živković EM, Kabelac S. A new setup for speed of sound measurements and experimental data for nanofluids Al2O3 or Ag with water or ethylene glycol. in Journal of Molecular Liquids. 2023;389:122930.
doi:10.1016/j.molliq.2023.122930 .

Majstorović, Divna M., Quindel, Patrick, Živković, Emila M., Kabelac, Stephan, "A new setup for speed of sound measurements and experimental data for nanofluids Al2O3 or Ag with water or ethylene glycol" in Journal of Molecular Liquids, 389 (2023):122930,
https://doi.org/10.1016/j.molliq.2023.122930 . .

TY  - JOUR
AU  - Živković, Emila
AU  - Kabelac, Stephan
AU  - Šerbanović, Slobodan P.
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1382
AB  - The evaporation heat transfer coefficient of the refrigerant R-134a in a vertical plate heat exchanger was investigated experimentally. The area of the plate was divided into several segments along the vertical axis. For each of the segments, the local value of the heat transfer coefficient was calculated and presented as a function of the mean vapor quality in the segment. Owing to the thermocouples installed along the plate surface, it was possible to determine the temperature distribution and vapor quality profile inside the plate. The influences of the mass flux, heat flux, pressure of system and the flow configuration on the heat transfer coefficient were also taken into account and a comparison with literature data was performed.
AB  - U ovom radu je eksperimentalno ispitivan koeficijent prelaza toplote pri dvofaznom toku rashladnog fluida 1,1,1,2-tetrafluoroetana (R-134a) u vertikalnom pločastom razmenjivaču toplote. Površina ploče je podeljena u nekoliko segmenata duž vertikalne ose. U svakom od segmenata izračunata je lokalna vrednost koeficijenta prelaza toplote i prikazana u funkciji srednjeg stepena suvoće u segmentu. Zahvaljujući termoparovima postavljenim duž površine ploče, bilo je moguće odrediti temperaturne profile i raspodelu stepena suvoće duž ploče. Ispitivani su uticaji masenog fluksa, toplotnog fluksa, radnog pritiska i konfiguracije toka fluida na koeficijent prelaza toplote i izvršeno je poređenje sa odgovarajućim literaturnim podacima.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Local heat transfer coefficients during the evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a plate heat exchanger
T1  - Lokalni koeficijenti prelaza toplote pri isparavanju 1,1,1,2-tetrafluoretana (R-134a) u pločastom razmenjivaču toplote
EP  - 440
IS  - 4
SP  - 427
VL  - 74
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1382
ER  - 

@article{
author = "Živković, Emila and Kabelac, Stephan and Šerbanović, Slobodan P.",
year = "2009",
abstract = "The evaporation heat transfer coefficient of the refrigerant R-134a in a vertical plate heat exchanger was investigated experimentally. The area of the plate was divided into several segments along the vertical axis. For each of the segments, the local value of the heat transfer coefficient was calculated and presented as a function of the mean vapor quality in the segment. Owing to the thermocouples installed along the plate surface, it was possible to determine the temperature distribution and vapor quality profile inside the plate. The influences of the mass flux, heat flux, pressure of system and the flow configuration on the heat transfer coefficient were also taken into account and a comparison with literature data was performed., U ovom radu je eksperimentalno ispitivan koeficijent prelaza toplote pri dvofaznom toku rashladnog fluida 1,1,1,2-tetrafluoroetana (R-134a) u vertikalnom pločastom razmenjivaču toplote. Površina ploče je podeljena u nekoliko segmenata duž vertikalne ose. U svakom od segmenata izračunata je lokalna vrednost koeficijenta prelaza toplote i prikazana u funkciji srednjeg stepena suvoće u segmentu. Zahvaljujući termoparovima postavljenim duž površine ploče, bilo je moguće odrediti temperaturne profile i raspodelu stepena suvoće duž ploče. Ispitivani su uticaji masenog fluksa, toplotnog fluksa, radnog pritiska i konfiguracije toka fluida na koeficijent prelaza toplote i izvršeno je poređenje sa odgovarajućim literaturnim podacima.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Local heat transfer coefficients during the evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a plate heat exchanger, Lokalni koeficijenti prelaza toplote pri isparavanju 1,1,1,2-tetrafluoretana (R-134a) u pločastom razmenjivaču toplote",
pages = "440-427",
number = "4",
volume = "74",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1382"
}

Živković, E., Kabelac, S.,& Šerbanović, S. P.. (2009). Local heat transfer coefficients during the evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a plate heat exchanger. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 74(4), 427-440.
https://hdl.handle.net/21.15107/rcub_technorep_1382

Živković E, Kabelac S, Šerbanović SP. Local heat transfer coefficients during the evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a plate heat exchanger. in Journal of the Serbian Chemical Society. 2009;74(4):427-440.
https://hdl.handle.net/21.15107/rcub_technorep_1382 .

Živković, Emila, Kabelac, Stephan, Šerbanović, Slobodan P., "Local heat transfer coefficients during the evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a plate heat exchanger" in Journal of the Serbian Chemical Society, 74, no. 4 (2009):427-440,
https://hdl.handle.net/21.15107/rcub_technorep_1382 .

TY  - CONF
AU  - Živković, Emila
AU  - Kabelac, Stephan
AU  - Šerbanović, Slobodan P.
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1214
AB  - The evaporation heat transfer coefficient of refrigerant R-134a in a vertical plate heat exchanger was investigated. The area of the plate was divided into several segments along the vertical axis. For each of the segments, the local value of the heat transfer coefficient was calculated and presented as a function of the mean vapor quality in the segment. The temperature distribution and vapor quality profile inside the plate were determined. The influences of the mass flux, heat flux, system pressure, and flow configuration on the heat transfer coefficient were accounted for and a comparison with published data was carried out. This is an abstract of a paper presented at the 18th International Congress of Chemical and Process Engineering (Prague, Czech Republic 8/24-28/2008).
PB  - 18th International Congress of Chemical and Process Engineering, CHISA 2008
C3  - CHISA 2008 - 18th International Congress of Chemical and Process Engineering
T1  - Local heat transfer coefficients during refrigerant R-134a evaporation in a vertical plate heat exchanger
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1214
ER  - 

@conference{
author = "Živković, Emila and Kabelac, Stephan and Šerbanović, Slobodan P.",
year = "2008",
abstract = "The evaporation heat transfer coefficient of refrigerant R-134a in a vertical plate heat exchanger was investigated. The area of the plate was divided into several segments along the vertical axis. For each of the segments, the local value of the heat transfer coefficient was calculated and presented as a function of the mean vapor quality in the segment. The temperature distribution and vapor quality profile inside the plate were determined. The influences of the mass flux, heat flux, system pressure, and flow configuration on the heat transfer coefficient were accounted for and a comparison with published data was carried out. This is an abstract of a paper presented at the 18th International Congress of Chemical and Process Engineering (Prague, Czech Republic 8/24-28/2008).",
publisher = "18th International Congress of Chemical and Process Engineering, CHISA 2008",
journal = "CHISA 2008 - 18th International Congress of Chemical and Process Engineering",
title = "Local heat transfer coefficients during refrigerant R-134a evaporation in a vertical plate heat exchanger",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1214"
}

Živković, E., Kabelac, S.,& Šerbanović, S. P.. (2008). Local heat transfer coefficients during refrigerant R-134a evaporation in a vertical plate heat exchanger. in CHISA 2008 - 18th International Congress of Chemical and Process Engineering
18th International Congress of Chemical and Process Engineering, CHISA 2008..
https://hdl.handle.net/21.15107/rcub_technorep_1214

Živković E, Kabelac S, Šerbanović SP. Local heat transfer coefficients during refrigerant R-134a evaporation in a vertical plate heat exchanger. in CHISA 2008 - 18th International Congress of Chemical and Process Engineering. 2008;.
https://hdl.handle.net/21.15107/rcub_technorep_1214 .

Živković, Emila, Kabelac, Stephan, Šerbanović, Slobodan P., "Local heat transfer coefficients during refrigerant R-134a evaporation in a vertical plate heat exchanger" in CHISA 2008 - 18th International Congress of Chemical and Process Engineering (2008),
https://hdl.handle.net/21.15107/rcub_technorep_1214 .

TY  - JOUR
AU  - Đorđević, Emila M.
AU  - Kabelac, Stephan
AU  - Šerbanović, Slobodan P.
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1268
AB  - The condensation heat transfer coefficient and the two-phase pressure drop of refrigerant R-134a in a vertical plate heat exchanger were investigated experimentally. The area of the plate was divided into several segments along the vertical axis. For each of the segments, local values of the heat transfer coefficient and frictional pressure drop were calculated and presented as a function of the mean vapor quality in the segment. Owing to the thermocouples installed along the plate surface, it was possible to determine the temperature distribution and vapor quality profile inside the plate. The influences of the mass flux and the heat flux on the heat transfer coefficient and the pressure drop were also taken into account and a comparison with previously published experimental data and literature correlations was carried out.
PB  - Versita, Warsaw
T2  - Chemical Papers
T1  - Heat transfer coefficient and pressure drop during refrigerant R-134a condensation in a plate heat exchanger
EP  - 85
IS  - 1
SP  - 78
VL  - 62
DO  - 10.2478/s11696-007-0082-8
ER  - 

@article{
author = "Đorđević, Emila M. and Kabelac, Stephan and Šerbanović, Slobodan P.",
year = "2008",
abstract = "The condensation heat transfer coefficient and the two-phase pressure drop of refrigerant R-134a in a vertical plate heat exchanger were investigated experimentally. The area of the plate was divided into several segments along the vertical axis. For each of the segments, local values of the heat transfer coefficient and frictional pressure drop were calculated and presented as a function of the mean vapor quality in the segment. Owing to the thermocouples installed along the plate surface, it was possible to determine the temperature distribution and vapor quality profile inside the plate. The influences of the mass flux and the heat flux on the heat transfer coefficient and the pressure drop were also taken into account and a comparison with previously published experimental data and literature correlations was carried out.",
publisher = "Versita, Warsaw",
journal = "Chemical Papers",
title = "Heat transfer coefficient and pressure drop during refrigerant R-134a condensation in a plate heat exchanger",
pages = "85-78",
number = "1",
volume = "62",
doi = "10.2478/s11696-007-0082-8"
}

Đorđević, E. M., Kabelac, S.,& Šerbanović, S. P.. (2008). Heat transfer coefficient and pressure drop during refrigerant R-134a condensation in a plate heat exchanger. in Chemical Papers
Versita, Warsaw., 62(1), 78-85.
https://doi.org/10.2478/s11696-007-0082-8

Đorđević EM, Kabelac S, Šerbanović SP. Heat transfer coefficient and pressure drop during refrigerant R-134a condensation in a plate heat exchanger. in Chemical Papers. 2008;62(1):78-85.
doi:10.2478/s11696-007-0082-8 .

Đorđević, Emila M., Kabelac, Stephan, Šerbanović, Slobodan P., "Heat transfer coefficient and pressure drop during refrigerant R-134a condensation in a plate heat exchanger" in Chemical Papers, 62, no. 1 (2008):78-85,
https://doi.org/10.2478/s11696-007-0082-8 . .

TY  - JOUR
AU  - Đorđević, Emila
AU  - Kabelac, Stephan
AU  - Šerbanović, Slobodan
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5505
AB  - In this study the transfer coefficient of evaporation heat of the refrigerant 1,1,1,2-tetrafluoroethane (R-134a) in a vertical plate heat exchanger was experimentally investigated. The results are presented as the dependancy of the mean heat transfer coefficient for the whole heat exchanger on the mean vapor quality. The influences of mass flux, heat flux and flow configuration on the heat transfer coefficient were also taken into account and a comparison with previously published experimental data and literature correlations was made.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Mean heat transfer coefficients during the evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a plate heat exchanger
EP  - 846
IS  - 8-9
SP  - 833
VL  - 72
DO  - 10.2298/JSC0709833D
ER  - 

@article{
author = "Đorđević, Emila and Kabelac, Stephan and Šerbanović, Slobodan",
year = "2007",
abstract = "In this study the transfer coefficient of evaporation heat of the refrigerant 1,1,1,2-tetrafluoroethane (R-134a) in a vertical plate heat exchanger was experimentally investigated. The results are presented as the dependancy of the mean heat transfer coefficient for the whole heat exchanger on the mean vapor quality. The influences of mass flux, heat flux and flow configuration on the heat transfer coefficient were also taken into account and a comparison with previously published experimental data and literature correlations was made.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Mean heat transfer coefficients during the evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a plate heat exchanger",
pages = "846-833",
number = "8-9",
volume = "72",
doi = "10.2298/JSC0709833D"
}

Đorđević, E., Kabelac, S.,& Šerbanović, S.. (2007). Mean heat transfer coefficients during the evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a plate heat exchanger. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 72(8-9), 833-846.
https://doi.org/10.2298/JSC0709833D

Đorđević E, Kabelac S, Šerbanović S. Mean heat transfer coefficients during the evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a plate heat exchanger. in Journal of the Serbian Chemical Society. 2007;72(8-9):833-846.
doi:10.2298/JSC0709833D .

Đorđević, Emila, Kabelac, Stephan, Šerbanović, Slobodan, "Mean heat transfer coefficients during the evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a plate heat exchanger" in Journal of the Serbian Chemical Society, 72, no. 8-9 (2007):833-846,
https://doi.org/10.2298/JSC0709833D . .

TY  - JOUR
AU  - Đorđević, Emila
AU  - Kabelac, Stephan
AU  - Šerbanović, Slobodan
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5499
AB  - Experimental results for the pressure drop during the evaporation of the refrigerant 1,1,1,2-tetrafluoroethane (R-134a) in a vertical plate heat exchanger are presented in Ms paper. The influences of mass flux, heat flux and vapor quality on the two-phase pressure drop are specially analyzed and compared with previously published experimental data and literature correlations. All results are given in graphical form as the dependency of the frictional pressure drop on the mean vapor quality.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Pressure drop during evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a plate heat exchanger
EP  - 1022
IS  - 10
SP  - 1015
VL  - 72
DO  - 10.2298/JSC0710015D
ER  - 

@article{
author = "Đorđević, Emila and Kabelac, Stephan and Šerbanović, Slobodan",
year = "2007",
abstract = "Experimental results for the pressure drop during the evaporation of the refrigerant 1,1,1,2-tetrafluoroethane (R-134a) in a vertical plate heat exchanger are presented in Ms paper. The influences of mass flux, heat flux and vapor quality on the two-phase pressure drop are specially analyzed and compared with previously published experimental data and literature correlations. All results are given in graphical form as the dependency of the frictional pressure drop on the mean vapor quality.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Pressure drop during evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a plate heat exchanger",
pages = "1022-1015",
number = "10",
volume = "72",
doi = "10.2298/JSC0710015D"
}

Đorđević, E., Kabelac, S.,& Šerbanović, S.. (2007). Pressure drop during evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a plate heat exchanger. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 72(10), 1015-1022.
https://doi.org/10.2298/JSC0710015D

Đorđević E, Kabelac S, Šerbanović S. Pressure drop during evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a plate heat exchanger. in Journal of the Serbian Chemical Society. 2007;72(10):1015-1022.
doi:10.2298/JSC0710015D .

Đorđević, Emila, Kabelac, Stephan, Šerbanović, Slobodan, "Pressure drop during evaporation of 1,1,1,2-tetrafluoroethane (R-134a) in a plate heat exchanger" in Journal of the Serbian Chemical Society, 72, no. 10 (2007):1015-1022,
https://doi.org/10.2298/JSC0710015D . .