Živković, Goran S.

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  • Živković, Goran S. (10)
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Author's Bibliography

Two-dimensional mathematical model of liquid fuel combustion in bubbling fluidized bed applied for a fluidized furnace numerical simulation

Nemoda, Stevan; Paprika, Milijana; Mladenović, Milica R.; Marinković, Ana D.; Živković, Goran S.

(2018)

TY  - JOUR
AU  - Nemoda, Stevan
AU  - Paprika, Milijana
AU  - Mladenović, Milica R.
AU  - Marinković, Ana D.
AU  - Živković, Goran S.
PY  - 2018
UR  - http://www.doiserbia.nb.rs/Article.aspx?ID=0354-98361700307N
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/7696
AB  - Lately, experimental methods and numerical simulations are equally employed for the purpose of developing incineration bubbling fluidized bed (BFB) facilities. The paper presents the results of the 2-D CFD model of liquid fuel combustion in BFB, applied for numerical simulation of a fluidized bed furnace. The numerical procedure is based on the two-fluid Euler-Euler approach, where the velocity field of the gas and particles are modeled in analogy to the kinetic gas theory. The proposed numerical model comprises energy equations for all three phases (gas, inert fluidized particles, and liquid fuel), as well as the transport equations of chemical components that are participating in the reactions of combustion and devolatilization. The model equations are solved applying a commercial CFD package, whereby the user submodels were developed for heterogenic fluidized bed combustion of liquid fuels and for interphase drag forces for all three phases. The results of temperature field calculation were compared with the experiments, carried out in-house, on a BFB pilot facility. The numerical experiments, based on the proposed mathematical model, have been used for the purposes of analyzing the impacts of various fuel flow rates, and fluidization numbers, on the combustion efficiency and on the temperature fields in the combustion zone.
T2  - Thermal Science
T1  - Two-dimensional mathematical model of liquid fuel combustion in bubbling fluidized bed applied for a fluidized furnace numerical simulation
VL  - 22
IS  - 2
SP  - 1121
EP  - 1135
DO  - 10.2298/TSCI170922307N
ER  - 
@article{
author = "Nemoda, Stevan and Paprika, Milijana and Mladenović, Milica R. and Marinković, Ana D. and Živković, Goran S.",
year = "2018",
abstract = "Lately, experimental methods and numerical simulations are equally employed for the purpose of developing incineration bubbling fluidized bed (BFB) facilities. The paper presents the results of the 2-D CFD model of liquid fuel combustion in BFB, applied for numerical simulation of a fluidized bed furnace. The numerical procedure is based on the two-fluid Euler-Euler approach, where the velocity field of the gas and particles are modeled in analogy to the kinetic gas theory. The proposed numerical model comprises energy equations for all three phases (gas, inert fluidized particles, and liquid fuel), as well as the transport equations of chemical components that are participating in the reactions of combustion and devolatilization. The model equations are solved applying a commercial CFD package, whereby the user submodels were developed for heterogenic fluidized bed combustion of liquid fuels and for interphase drag forces for all three phases. The results of temperature field calculation were compared with the experiments, carried out in-house, on a BFB pilot facility. The numerical experiments, based on the proposed mathematical model, have been used for the purposes of analyzing the impacts of various fuel flow rates, and fluidization numbers, on the combustion efficiency and on the temperature fields in the combustion zone.",
journal = "Thermal Science",
title = "Two-dimensional mathematical model of liquid fuel combustion in bubbling fluidized bed applied for a fluidized furnace numerical simulation",
volume = "22",
number = "2",
pages = "1121-1135",
doi = "10.2298/TSCI170922307N"
}
Nemoda, S., Paprika, M., Mladenović, M. R., Marinković, A. D.,& Živković, G. S.. (2018). Two-dimensional mathematical model of liquid fuel combustion in bubbling fluidized bed applied for a fluidized furnace numerical simulation. in Thermal Science, 22(2), 1121-1135.
https://doi.org/10.2298/TSCI170922307N
Nemoda S, Paprika M, Mladenović MR, Marinković AD, Živković GS. Two-dimensional mathematical model of liquid fuel combustion in bubbling fluidized bed applied for a fluidized furnace numerical simulation. in Thermal Science. 2018;22(2):1121-1135.
doi:10.2298/TSCI170922307N .
Nemoda, Stevan, Paprika, Milijana, Mladenović, Milica R., Marinković, Ana D., Živković, Goran S., "Two-dimensional mathematical model of liquid fuel combustion in bubbling fluidized bed applied for a fluidized furnace numerical simulation" in Thermal Science, 22, no. 2 (2018):1121-1135,
https://doi.org/10.2298/TSCI170922307N . .
1
1

Numerical simulation of latent heat storage with conductance enhancing fins

Rudonja, Nedzad R.; Komatina, Mirko S.; Antonijević, Dragi Lj.; Živković, Goran S.

(2016)

TY  - JOUR
AU  - Rudonja, Nedzad R.
AU  - Komatina, Mirko S.
AU  - Antonijević, Dragi Lj.
AU  - Živković, Goran S.
PY  - 2016
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/7151
AB  - Precise understanding of heat transfer processes inside the latent thermal energy storage exposed to different initial and boundary conditions is crucial for development of optimized design and operating features of similar devices. The paper presents 3D numerical study of phase change material heat storage in the shape of vertical cylinder reservoir with axially placed heat source/sink equipped with variable number of conductance enhancing longitudinal rectangular fins. As the principally important observed is the case of vertically variable heat flux supplied to the phase change material during the melting process. The numerical modeling is based on the physical model of the process and is being carried out by Fluent software that uses finite volume method for solving continuity, momentum and energy equations. The coupling between pressure and velocity is based on the Semi- Implicit Pressure- Linked Equation (SIMPLE) algorithm. The results of numerical simulations are verified through the comparison with the own experimental results. Exemplary results for characteristic heat storage geometries and boundary conditions are presented and analyzed in the paper.
T2  - Bulgarian Chemical Communications
T1  - Numerical simulation of latent heat storage with conductance enhancing fins
VL  - 48
SP  - 199
EP  - 205
ER  - 
@article{
author = "Rudonja, Nedzad R. and Komatina, Mirko S. and Antonijević, Dragi Lj. and Živković, Goran S.",
year = "2016",
abstract = "Precise understanding of heat transfer processes inside the latent thermal energy storage exposed to different initial and boundary conditions is crucial for development of optimized design and operating features of similar devices. The paper presents 3D numerical study of phase change material heat storage in the shape of vertical cylinder reservoir with axially placed heat source/sink equipped with variable number of conductance enhancing longitudinal rectangular fins. As the principally important observed is the case of vertically variable heat flux supplied to the phase change material during the melting process. The numerical modeling is based on the physical model of the process and is being carried out by Fluent software that uses finite volume method for solving continuity, momentum and energy equations. The coupling between pressure and velocity is based on the Semi- Implicit Pressure- Linked Equation (SIMPLE) algorithm. The results of numerical simulations are verified through the comparison with the own experimental results. Exemplary results for characteristic heat storage geometries and boundary conditions are presented and analyzed in the paper.",
journal = "Bulgarian Chemical Communications",
title = "Numerical simulation of latent heat storage with conductance enhancing fins",
volume = "48",
pages = "199-205"
}
Rudonja, N. R., Komatina, M. S., Antonijević, D. Lj.,& Živković, G. S.. (2016). Numerical simulation of latent heat storage with conductance enhancing fins. in Bulgarian Chemical Communications, 48, 199-205.
Rudonja NR, Komatina MS, Antonijević DL, Živković GS. Numerical simulation of latent heat storage with conductance enhancing fins. in Bulgarian Chemical Communications. 2016;48:199-205..
Rudonja, Nedzad R., Komatina, Mirko S., Antonijević, Dragi Lj., Živković, Goran S., "Numerical simulation of latent heat storage with conductance enhancing fins" in Bulgarian Chemical Communications, 48 (2016):199-205.

Heat Transfer Enhancement Through Pcm Thermal Storage By Use of Copper Fins

Rudonja, Nedzad R.; Komatina, Mirko S.; Živković, Goran S.; Antonijević, Dragi Lj.

(2016)

TY  - JOUR
AU  - Rudonja, Nedzad R.
AU  - Komatina, Mirko S.
AU  - Živković, Goran S.
AU  - Antonijević, Dragi Lj.
PY  - 2016
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1148
AB  - Enhancement of heat transfer over a cylinder shaped thermal energy storage filled by paraffin E53 by use of longitudinal rectangular copper fins was analyzed. The thermo-physical features of the storage material are determined in separate experiments and implemented to FLUENT software over user defined function. Advanced thermal storage geometry comprehension and optimization required introduction of a parameter suitable for the analysis of heat transfer enhancement, so the ratio of heat transfer surfaces as a factor was proposed and applied. It is revealed that increase of the ratio of heat transfer surfaces leads to the decrease of melting time and vice versa. Numerical analysis, employing the 3-D model built in Ansys software, observed storage reservoir geometries with variable number of longitudinal fins. The adjusted set of boundary conditions was carried out and both written in C language and implemented over user defined function in order to define variable heat flux along the height of the heater. The comparison of acquired numerical and experimental results showed a strong correlation. Experimental validation of numerical results was done on the real thermal energy storage apparatus.
T2  - Thermal Science
T1  - Heat Transfer Enhancement Through Pcm Thermal Storage By Use of Copper Fins
VL  - 20
SP  - S251
EP  - S259
DO  - 10.2298/TSCI150729136R
ER  - 
@article{
author = "Rudonja, Nedzad R. and Komatina, Mirko S. and Živković, Goran S. and Antonijević, Dragi Lj.",
year = "2016",
abstract = "Enhancement of heat transfer over a cylinder shaped thermal energy storage filled by paraffin E53 by use of longitudinal rectangular copper fins was analyzed. The thermo-physical features of the storage material are determined in separate experiments and implemented to FLUENT software over user defined function. Advanced thermal storage geometry comprehension and optimization required introduction of a parameter suitable for the analysis of heat transfer enhancement, so the ratio of heat transfer surfaces as a factor was proposed and applied. It is revealed that increase of the ratio of heat transfer surfaces leads to the decrease of melting time and vice versa. Numerical analysis, employing the 3-D model built in Ansys software, observed storage reservoir geometries with variable number of longitudinal fins. The adjusted set of boundary conditions was carried out and both written in C language and implemented over user defined function in order to define variable heat flux along the height of the heater. The comparison of acquired numerical and experimental results showed a strong correlation. Experimental validation of numerical results was done on the real thermal energy storage apparatus.",
journal = "Thermal Science",
title = "Heat Transfer Enhancement Through Pcm Thermal Storage By Use of Copper Fins",
volume = "20",
pages = "S251-S259",
doi = "10.2298/TSCI150729136R"
}
Rudonja, N. R., Komatina, M. S., Živković, G. S.,& Antonijević, D. Lj.. (2016). Heat Transfer Enhancement Through Pcm Thermal Storage By Use of Copper Fins. in Thermal Science, 20, S251-S259.
https://doi.org/10.2298/TSCI150729136R
Rudonja NR, Komatina MS, Živković GS, Antonijević DL. Heat Transfer Enhancement Through Pcm Thermal Storage By Use of Copper Fins. in Thermal Science. 2016;20:S251-S259.
doi:10.2298/TSCI150729136R .
Rudonja, Nedzad R., Komatina, Mirko S., Živković, Goran S., Antonijević, Dragi Lj., "Heat Transfer Enhancement Through Pcm Thermal Storage By Use of Copper Fins" in Thermal Science, 20 (2016):S251-S259,
https://doi.org/10.2298/TSCI150729136R . .
5
5

Mechanism of Primary Fragmentation of Coal in Fluidized Bed

Paprika, Milijana; Komatina, Mirko S.; Mladenović, Milica R.; Živković, Goran S.; Dakić, Dragoljub V.

(2016)

TY  - JOUR
AU  - Paprika, Milijana
AU  - Komatina, Mirko S.
AU  - Mladenović, Milica R.
AU  - Živković, Goran S.
AU  - Dakić, Dragoljub V.
PY  - 2016
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1139
AB  - In order to lay a foundation of a credible primacy fragmentation model, a theoretical analysis of the thermo-mechanical processes in a devolatilizing solid fuel particle was carried out. The devolatilization model comprises heat transfer, chemical processes of generation of gaseous products of combustion (volatiles), volatile transfer, and solid mechanic processes. A spatial and temporal analysis of the stresses within the particle showed that the radial stress is caused primarily by the pressure of generated volatiles. This stress monotonously decreases from the particle center towards the particle surface, without changing its sign. The tangential stress is caused primarily by the thermal shock. Close to the surface, it changes its sign. In the particle cross-section, the radial stress prevails close to the particle center, whilst the tangential stress is dominant in the surface region. At the points where these stresses exceed the particle tensile strength, cracks occur. Cracks extend tangentially close to the surface, and radially close to the center of the particle.
T2  - Thermal Science
T1  - Mechanism of Primary Fragmentation of Coal in Fluidized Bed
VL  - 20
SP  - S125
EP  - S132
DO  - 10.2298/TSCI150603224P
ER  - 
@article{
author = "Paprika, Milijana and Komatina, Mirko S. and Mladenović, Milica R. and Živković, Goran S. and Dakić, Dragoljub V.",
year = "2016",
abstract = "In order to lay a foundation of a credible primacy fragmentation model, a theoretical analysis of the thermo-mechanical processes in a devolatilizing solid fuel particle was carried out. The devolatilization model comprises heat transfer, chemical processes of generation of gaseous products of combustion (volatiles), volatile transfer, and solid mechanic processes. A spatial and temporal analysis of the stresses within the particle showed that the radial stress is caused primarily by the pressure of generated volatiles. This stress monotonously decreases from the particle center towards the particle surface, without changing its sign. The tangential stress is caused primarily by the thermal shock. Close to the surface, it changes its sign. In the particle cross-section, the radial stress prevails close to the particle center, whilst the tangential stress is dominant in the surface region. At the points where these stresses exceed the particle tensile strength, cracks occur. Cracks extend tangentially close to the surface, and radially close to the center of the particle.",
journal = "Thermal Science",
title = "Mechanism of Primary Fragmentation of Coal in Fluidized Bed",
volume = "20",
pages = "S125-S132",
doi = "10.2298/TSCI150603224P"
}
Paprika, M., Komatina, M. S., Mladenović, M. R., Živković, G. S.,& Dakić, D. V.. (2016). Mechanism of Primary Fragmentation of Coal in Fluidized Bed. in Thermal Science, 20, S125-S132.
https://doi.org/10.2298/TSCI150603224P
Paprika M, Komatina MS, Mladenović MR, Živković GS, Dakić DV. Mechanism of Primary Fragmentation of Coal in Fluidized Bed. in Thermal Science. 2016;20:S125-S132.
doi:10.2298/TSCI150603224P .
Paprika, Milijana, Komatina, Mirko S., Mladenović, Milica R., Živković, Goran S., Dakić, Dragoljub V., "Mechanism of Primary Fragmentation of Coal in Fluidized Bed" in Thermal Science, 20 (2016):S125-S132,
https://doi.org/10.2298/TSCI150603224P . .
3
3
4

Experimental and Numerical Investigation of the Primary Fragmentation of a Lignite during Fluidized-Bed (FB) Devolatilization

Paprika, Milijana; Komatina, Mirko; Dakić, Dragoljub V.; Živković, Goran S.; Mladenović, Milica R.

(2015)

TY  - JOUR
AU  - Paprika, Milijana
AU  - Komatina, Mirko
AU  - Dakić, Dragoljub V.
AU  - Živković, Goran S.
AU  - Mladenović, Milica R.
PY  - 2015
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/7069
AB  - The paper presents a comparison between experimental and model results of primary fragmentation of a lignite coal in a fluidized bed (FB). In the experiments, the char particle size distribution and the general indicators of primary fragmentation (intensity and index) were determined. The same parameters were calculated using a mathematical model of the process, fed by data of the fuel (the amount of volatiles and fixed carbon), fluidized bed temperature; and inlet particle size distribution. The size distribution and number of the char particles in fluidized bed significantly differ from the size distribution and number of inlet coal particles. Char population has a bimodal distribution separate distributions for the smaller and larger sets of fragments. The experimental and model results show the same tendency: a coal particle partially breaks at the beginning of devolatilization, giving a large number of fine fragments, while, as the process continues, the rest of the parent particle sometimes breaks down into a smaller number of larger pieces, and sometimes does not fragment at all. Review of the Weibull distribution coefficients enables prediction of the char particle size distribution for the characteristic fluidized bed conditions and inlet coal particle sizes.
T2  - Energy and Fuels
T1  - Experimental and Numerical Investigation of the Primary Fragmentation of a Lignite during Fluidized-Bed (FB) Devolatilization
VL  - 29
IS  - 5
SP  - 3394
EP  - 3398
DO  - 10.1021/ef5024803
ER  - 
@article{
author = "Paprika, Milijana and Komatina, Mirko and Dakić, Dragoljub V. and Živković, Goran S. and Mladenović, Milica R.",
year = "2015",
abstract = "The paper presents a comparison between experimental and model results of primary fragmentation of a lignite coal in a fluidized bed (FB). In the experiments, the char particle size distribution and the general indicators of primary fragmentation (intensity and index) were determined. The same parameters were calculated using a mathematical model of the process, fed by data of the fuel (the amount of volatiles and fixed carbon), fluidized bed temperature; and inlet particle size distribution. The size distribution and number of the char particles in fluidized bed significantly differ from the size distribution and number of inlet coal particles. Char population has a bimodal distribution separate distributions for the smaller and larger sets of fragments. The experimental and model results show the same tendency: a coal particle partially breaks at the beginning of devolatilization, giving a large number of fine fragments, while, as the process continues, the rest of the parent particle sometimes breaks down into a smaller number of larger pieces, and sometimes does not fragment at all. Review of the Weibull distribution coefficients enables prediction of the char particle size distribution for the characteristic fluidized bed conditions and inlet coal particle sizes.",
journal = "Energy and Fuels",
title = "Experimental and Numerical Investigation of the Primary Fragmentation of a Lignite during Fluidized-Bed (FB) Devolatilization",
volume = "29",
number = "5",
pages = "3394-3398",
doi = "10.1021/ef5024803"
}
Paprika, M., Komatina, M., Dakić, D. V., Živković, G. S.,& Mladenović, M. R.. (2015). Experimental and Numerical Investigation of the Primary Fragmentation of a Lignite during Fluidized-Bed (FB) Devolatilization. in Energy and Fuels, 29(5), 3394-3398.
https://doi.org/10.1021/ef5024803
Paprika M, Komatina M, Dakić DV, Živković GS, Mladenović MR. Experimental and Numerical Investigation of the Primary Fragmentation of a Lignite during Fluidized-Bed (FB) Devolatilization. in Energy and Fuels. 2015;29(5):3394-3398.
doi:10.1021/ef5024803 .
Paprika, Milijana, Komatina, Mirko, Dakić, Dragoljub V., Živković, Goran S., Mladenović, Milica R., "Experimental and Numerical Investigation of the Primary Fragmentation of a Lignite during Fluidized-Bed (FB) Devolatilization" in Energy and Fuels, 29, no. 5 (2015):3394-3398,
https://doi.org/10.1021/ef5024803 . .
2
3
3

Experimental determination of the swirl burner laboratory models hydraulic resistance

Repić, Branislav; Erić, Aleksandar; Đurović, Dejan R.; Marinković, Ana D.; Živković, Goran S.

(2012)

TY  - CONF
AU  - Repić, Branislav
AU  - Erić, Aleksandar
AU  - Đurović, Dejan R.
AU  - Marinković, Ana D.
AU  - Živković, Goran S.
PY  - 2012
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/7154
AB  - Performed investigation of pulverized fuel combustion in swirl flows has shown that there are two important groups of influential parameters: fuel and burner characteristics. The most important conclusion of these investigations is that each type of fuel needs a defined burner for its combustion and concrete operating parameters for its optimal work. Optimal operating parameters can be determined only by performing the appropriate experiments. Selection of optimal swirl burner design is dependent on energy loss which is used for air transport through burner. Increasing of swirl intensity is convenient for fuel ignition and flame stability, but energy loss for air transport increases, too. Swirl economy is estimated using hydraulic resistance parameter which represents energy loss due to swirling. In the paper are presented the methods and experimental data of hydraulic resistance determination for three laboratory models of swirl burners for pulverized fuel combustion. In the tangential burner the swirling is accomplished by tangential inflow of secondary air and fuel/air mixture. Axial-blade burner of type 1 enables swirling by a set of 18 blades. Axial-blade burner of type 2 is with a central lead of gas and coaxial lead of fuel/air mixture, primary air and recirculating gases. In movable swirl block burner the secondary air swirling is enabled by 8 stationary and 8 movable blocks fixed at movable and stationary plate. (C) 2012 Published by Elsevier Ltd.
C3  - Procedia Engineering
T1  - Experimental determination of the swirl burner laboratory models hydraulic resistance
VL  - 42
SP  - 672
EP  - 682
DO  - 10.1016/j.proeng.2012.07.460
ER  - 
@conference{
author = "Repić, Branislav and Erić, Aleksandar and Đurović, Dejan R. and Marinković, Ana D. and Živković, Goran S.",
year = "2012",
abstract = "Performed investigation of pulverized fuel combustion in swirl flows has shown that there are two important groups of influential parameters: fuel and burner characteristics. The most important conclusion of these investigations is that each type of fuel needs a defined burner for its combustion and concrete operating parameters for its optimal work. Optimal operating parameters can be determined only by performing the appropriate experiments. Selection of optimal swirl burner design is dependent on energy loss which is used for air transport through burner. Increasing of swirl intensity is convenient for fuel ignition and flame stability, but energy loss for air transport increases, too. Swirl economy is estimated using hydraulic resistance parameter which represents energy loss due to swirling. In the paper are presented the methods and experimental data of hydraulic resistance determination for three laboratory models of swirl burners for pulverized fuel combustion. In the tangential burner the swirling is accomplished by tangential inflow of secondary air and fuel/air mixture. Axial-blade burner of type 1 enables swirling by a set of 18 blades. Axial-blade burner of type 2 is with a central lead of gas and coaxial lead of fuel/air mixture, primary air and recirculating gases. In movable swirl block burner the secondary air swirling is enabled by 8 stationary and 8 movable blocks fixed at movable and stationary plate. (C) 2012 Published by Elsevier Ltd.",
journal = "Procedia Engineering",
title = "Experimental determination of the swirl burner laboratory models hydraulic resistance",
volume = "42",
pages = "672-682",
doi = "10.1016/j.proeng.2012.07.460"
}
Repić, B., Erić, A., Đurović, D. R., Marinković, A. D.,& Živković, G. S.. (2012). Experimental determination of the swirl burner laboratory models hydraulic resistance. in Procedia Engineering, 42, 672-682.
https://doi.org/10.1016/j.proeng.2012.07.460
Repić B, Erić A, Đurović DR, Marinković AD, Živković GS. Experimental determination of the swirl burner laboratory models hydraulic resistance. in Procedia Engineering. 2012;42:672-682.
doi:10.1016/j.proeng.2012.07.460 .
Repić, Branislav, Erić, Aleksandar, Đurović, Dejan R., Marinković, Ana D., Živković, Goran S., "Experimental determination of the swirl burner laboratory models hydraulic resistance" in Procedia Engineering, 42 (2012):672-682,
https://doi.org/10.1016/j.proeng.2012.07.460 . .

Numerical Simulation of the Air Flow Around the Arrays of Solar Collectors

Bakić, Vukman; Živković, Goran S.; Pezo, Milada L.

(2011)

TY  - JOUR
AU  - Bakić, Vukman
AU  - Živković, Goran S.
AU  - Pezo, Milada L.
PY  - 2011
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/4403
AB  - This paper deals with the numerical simulation of air flow around the arrays of flat plate collectors and determination of the flow field, which should provide a basis for estimating a convective heat losses, a parameter which influences their working characteristics. Heat losses are the result of the reflection on the glass, conductive losses at the collectors absorber plate, radiation of the absorber plate and convective losses on the glass. Wind velocity in the vicinity of the absorber plate depends on its position in the arrays of collectors. Results obtained in the numerical simulation of flow around collectors were used as boundary conditions in modeling of thermal-hydraulic processes inside the solar collector. A method for coupling thermal-hydraulic processes inside the collector with heat transfer from plate to tube bundle was developed, in order to find out the distribution of the temperature of the absorber plate and the efficiency of the flat plate collectors. Analyses of flow around arrays of collectors are preformed with RNG k-epsilon model. Three values for free-stream velocity were analysed, i.e. 1 m/s, 5 m/s, and 10 m/s, as well as two values for the angle between the ground and the collector (20 degrees and 40 degrees). Heat transfer coefficient was determined from the theory of boundary layer. Heat transfer inside the plate cavity was analyzed assuming constant intensity of radiation.
T2  - Thermal Science
T1  - Numerical Simulation of the Air Flow Around the Arrays of Solar Collectors
VL  - 15
IS  - 2
SP  - 457
EP  - 465
DO  - 10.2298/TSCI110222051B
ER  - 
@article{
author = "Bakić, Vukman and Živković, Goran S. and Pezo, Milada L.",
year = "2011",
abstract = "This paper deals with the numerical simulation of air flow around the arrays of flat plate collectors and determination of the flow field, which should provide a basis for estimating a convective heat losses, a parameter which influences their working characteristics. Heat losses are the result of the reflection on the glass, conductive losses at the collectors absorber plate, radiation of the absorber plate and convective losses on the glass. Wind velocity in the vicinity of the absorber plate depends on its position in the arrays of collectors. Results obtained in the numerical simulation of flow around collectors were used as boundary conditions in modeling of thermal-hydraulic processes inside the solar collector. A method for coupling thermal-hydraulic processes inside the collector with heat transfer from plate to tube bundle was developed, in order to find out the distribution of the temperature of the absorber plate and the efficiency of the flat plate collectors. Analyses of flow around arrays of collectors are preformed with RNG k-epsilon model. Three values for free-stream velocity were analysed, i.e. 1 m/s, 5 m/s, and 10 m/s, as well as two values for the angle between the ground and the collector (20 degrees and 40 degrees). Heat transfer coefficient was determined from the theory of boundary layer. Heat transfer inside the plate cavity was analyzed assuming constant intensity of radiation.",
journal = "Thermal Science",
title = "Numerical Simulation of the Air Flow Around the Arrays of Solar Collectors",
volume = "15",
number = "2",
pages = "457-465",
doi = "10.2298/TSCI110222051B"
}
Bakić, V., Živković, G. S.,& Pezo, M. L.. (2011). Numerical Simulation of the Air Flow Around the Arrays of Solar Collectors. in Thermal Science, 15(2), 457-465.
https://doi.org/10.2298/TSCI110222051B
Bakić V, Živković GS, Pezo ML. Numerical Simulation of the Air Flow Around the Arrays of Solar Collectors. in Thermal Science. 2011;15(2):457-465.
doi:10.2298/TSCI110222051B .
Bakić, Vukman, Živković, Goran S., Pezo, Milada L., "Numerical Simulation of the Air Flow Around the Arrays of Solar Collectors" in Thermal Science, 15, no. 2 (2011):457-465,
https://doi.org/10.2298/TSCI110222051B . .
3
7
8

Numerical analysis of discrete phase induced effects on a gas flow in a turbulent two-phase free jet

Stakic, Milan B.; Živković, Goran S.; Sijercic, Miroslav A.

(2011)

TY  - JOUR
AU  - Stakic, Milan B.
AU  - Živković, Goran S.
AU  - Sijercic, Miroslav A.
PY  - 2011
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/4285
AB  - The paper addresses numerical simulation of turbulent two-phase flow in a long vertical tube and turbulent two-phase free jet formed at the tube outlet, analyzing agreement between the numerical results and the results of corresponding experimental investigation carried out earlier. In the numerical analyses conducted, gas phase was modeled as an air flow (having a mass flow-rate in the range of 1.25-4.00 g/s), while the sand particles of two different sizes (0.25-0.30 and 0.8-1.0 mm) represented a discrete phase (particle to gas mass flow ratio of 0.72-4.08) in the two-phase flow considered. Gas-particle interaction was analyzed based on the gas velocities in the particle-laden two-phase flow and the particle-free gas flow, calculated and measured at various locations along the longitudinal axis and radius of the jet. Mathematical model of continuous phase flow was developed based on the single phase flow models, with certain corrections introduced to account for the effects of particles in the flow. In the simulation model developed, the flow analyzed was modeled as a two-phase mixture, with Eulerian simulation used to account for the gas phase behavior and the Lagrangian simulation modeling the particle movement in the two-phase flow considered. In order to appropriately close the system of time-averaged equations, k-epsilon turbulent model, deemed the most reliable, was used. Phase coupling i.e. fluid-particle interaction was modeled using the PSI-CELL concept. The results obtained via numerical simulation have shown a good agreement with the experimental data acquired. (C) 2011 Elsevier Ltd. All rights reserved.
T2  - International Journal of Heat and Mass Transfer
T1  - Numerical analysis of discrete phase induced effects on a gas flow in a turbulent two-phase free jet
VL  - 54
IS  - 11-12
SP  - 2262
EP  - 2269
DO  - 10.1016/j.ijheatmasstransfer.2011.02.039
ER  - 
@article{
author = "Stakic, Milan B. and Živković, Goran S. and Sijercic, Miroslav A.",
year = "2011",
abstract = "The paper addresses numerical simulation of turbulent two-phase flow in a long vertical tube and turbulent two-phase free jet formed at the tube outlet, analyzing agreement between the numerical results and the results of corresponding experimental investigation carried out earlier. In the numerical analyses conducted, gas phase was modeled as an air flow (having a mass flow-rate in the range of 1.25-4.00 g/s), while the sand particles of two different sizes (0.25-0.30 and 0.8-1.0 mm) represented a discrete phase (particle to gas mass flow ratio of 0.72-4.08) in the two-phase flow considered. Gas-particle interaction was analyzed based on the gas velocities in the particle-laden two-phase flow and the particle-free gas flow, calculated and measured at various locations along the longitudinal axis and radius of the jet. Mathematical model of continuous phase flow was developed based on the single phase flow models, with certain corrections introduced to account for the effects of particles in the flow. In the simulation model developed, the flow analyzed was modeled as a two-phase mixture, with Eulerian simulation used to account for the gas phase behavior and the Lagrangian simulation modeling the particle movement in the two-phase flow considered. In order to appropriately close the system of time-averaged equations, k-epsilon turbulent model, deemed the most reliable, was used. Phase coupling i.e. fluid-particle interaction was modeled using the PSI-CELL concept. The results obtained via numerical simulation have shown a good agreement with the experimental data acquired. (C) 2011 Elsevier Ltd. All rights reserved.",
journal = "International Journal of Heat and Mass Transfer",
title = "Numerical analysis of discrete phase induced effects on a gas flow in a turbulent two-phase free jet",
volume = "54",
number = "11-12",
pages = "2262-2269",
doi = "10.1016/j.ijheatmasstransfer.2011.02.039"
}
Stakic, M. B., Živković, G. S.,& Sijercic, M. A.. (2011). Numerical analysis of discrete phase induced effects on a gas flow in a turbulent two-phase free jet. in International Journal of Heat and Mass Transfer, 54(11-12), 2262-2269.
https://doi.org/10.1016/j.ijheatmasstransfer.2011.02.039
Stakic MB, Živković GS, Sijercic MA. Numerical analysis of discrete phase induced effects on a gas flow in a turbulent two-phase free jet. in International Journal of Heat and Mass Transfer. 2011;54(11-12):2262-2269.
doi:10.1016/j.ijheatmasstransfer.2011.02.039 .
Stakic, Milan B., Živković, Goran S., Sijercic, Miroslav A., "Numerical analysis of discrete phase induced effects on a gas flow in a turbulent two-phase free jet" in International Journal of Heat and Mass Transfer, 54, no. 11-12 (2011):2262-2269,
https://doi.org/10.1016/j.ijheatmasstransfer.2011.02.039 . .
10
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11

Numerical Simulation of the Influence of Stationary Louver and Coal Particle Size on Distribution of Pulverized Coal to the Feed Ducts of a Power Plant Burner

Živković, Goran S.; Nemoda, Stevan; Stefanović, Predrag Lj.; Radovanovic, Predrag

(2009)

TY  - JOUR
AU  - Živković, Goran S.
AU  - Nemoda, Stevan
AU  - Stefanović, Predrag Lj.
AU  - Radovanovic, Predrag
PY  - 2009
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/3861
AB  - One of the key requirements related to successful utilization of plasma technology as an oil-free backup system for coal ignition and combustion stabilization in power plant boilers is provision of properly regulated pulverized coal distribution to the feed ducts leading the fuel mixture to a burner. Proper regulation of coal distribution is deemed essential for achieving an adequate pulverized coal concentration in the zone where thermal plasma is being introduced The said can be efficiently achieved by installation of stationary louver in the coal-air mixing duct ahead of the feed ducts of a burner. The paper addresses numerical simulation of a two-phase flow of air-pulverized coal mixture in the mixing ducts, analysing the effects of particle size distribution on pulverized coal distribution to the burner feed ducts. Numerical simulation was performed rising the FLUENT 63 commercial code and related poly-dispersed flow module, based on the PSI-CELL approach. Numerical experiments have been performed assuming a mono-dispersed solid phase with particle diameter ranging from 45 mu m to 1200 mu m. Distance between the louver blades and the resulting effect on the flow profile was analysed as well. Results obtained indicate that the size of coal particles considerably influence the overall solid phase distribution. While fine particles, with diameters at the louver end of the above specified range, almost fully follow the streamlines of the continuous phase, coarser particles, which hit the louver blades, deflect towards the thermal plasma zone. In this manner, a desired phase concentration in the considered zone can be reached For the said reason, installation of stationary louver have been deemed a very efficient way to induce phase separation, primarily due to more pronounced impact of the installed louver on discrete phase flow then the impact on the flow of the continuous phase.
T2  - Thermal Science
T1  - Numerical Simulation of the Influence of Stationary Louver and Coal Particle Size on Distribution of Pulverized Coal to the Feed Ducts of a Power Plant Burner
VL  - 13
IS  - 4
SP  - 79
EP  - 90
DO  - 10.2298/TSCI0904079Z
ER  - 
@article{
author = "Živković, Goran S. and Nemoda, Stevan and Stefanović, Predrag Lj. and Radovanovic, Predrag",
year = "2009",
abstract = "One of the key requirements related to successful utilization of plasma technology as an oil-free backup system for coal ignition and combustion stabilization in power plant boilers is provision of properly regulated pulverized coal distribution to the feed ducts leading the fuel mixture to a burner. Proper regulation of coal distribution is deemed essential for achieving an adequate pulverized coal concentration in the zone where thermal plasma is being introduced The said can be efficiently achieved by installation of stationary louver in the coal-air mixing duct ahead of the feed ducts of a burner. The paper addresses numerical simulation of a two-phase flow of air-pulverized coal mixture in the mixing ducts, analysing the effects of particle size distribution on pulverized coal distribution to the burner feed ducts. Numerical simulation was performed rising the FLUENT 63 commercial code and related poly-dispersed flow module, based on the PSI-CELL approach. Numerical experiments have been performed assuming a mono-dispersed solid phase with particle diameter ranging from 45 mu m to 1200 mu m. Distance between the louver blades and the resulting effect on the flow profile was analysed as well. Results obtained indicate that the size of coal particles considerably influence the overall solid phase distribution. While fine particles, with diameters at the louver end of the above specified range, almost fully follow the streamlines of the continuous phase, coarser particles, which hit the louver blades, deflect towards the thermal plasma zone. In this manner, a desired phase concentration in the considered zone can be reached For the said reason, installation of stationary louver have been deemed a very efficient way to induce phase separation, primarily due to more pronounced impact of the installed louver on discrete phase flow then the impact on the flow of the continuous phase.",
journal = "Thermal Science",
title = "Numerical Simulation of the Influence of Stationary Louver and Coal Particle Size on Distribution of Pulverized Coal to the Feed Ducts of a Power Plant Burner",
volume = "13",
number = "4",
pages = "79-90",
doi = "10.2298/TSCI0904079Z"
}
Živković, G. S., Nemoda, S., Stefanović, P. Lj.,& Radovanovic, P.. (2009). Numerical Simulation of the Influence of Stationary Louver and Coal Particle Size on Distribution of Pulverized Coal to the Feed Ducts of a Power Plant Burner. in Thermal Science, 13(4), 79-90.
https://doi.org/10.2298/TSCI0904079Z
Živković GS, Nemoda S, Stefanović PL, Radovanovic P. Numerical Simulation of the Influence of Stationary Louver and Coal Particle Size on Distribution of Pulverized Coal to the Feed Ducts of a Power Plant Burner. in Thermal Science. 2009;13(4):79-90.
doi:10.2298/TSCI0904079Z .
Živković, Goran S., Nemoda, Stevan, Stefanović, Predrag Lj., Radovanovic, Predrag, "Numerical Simulation of the Influence of Stationary Louver and Coal Particle Size on Distribution of Pulverized Coal to the Feed Ducts of a Power Plant Burner" in Thermal Science, 13, no. 4 (2009):79-90,
https://doi.org/10.2298/TSCI0904079Z . .
2
7
7

Experimental and numerical investigation of gaseous fuel combustion in swirl chamber

Nemoda, Stevan; Bakić, Vukman; Oka, Simeon N.; Živković, Goran S.; Crnomarković, Nenad Đ.

(2005)

TY  - JOUR
AU  - Nemoda, Stevan
AU  - Bakić, Vukman
AU  - Oka, Simeon N.
AU  - Živković, Goran S.
AU  - Crnomarković, Nenad Đ.
PY  - 2005
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/2929
AB  - In this paper the results of experimental and numerical investigations of swirl burner were presented. Mathematical model for prediction of velocity, temperature and concentration fields of axisymmetrical confined swirl turbulent flame was developed. Model consists of few mutually coupled segments related to basic processes in turbulent flows with combustion. The original combustion rate model based on the ideal reacting hypothesis within fine structure of turbulence was applied. The comparison of the experimental results with computation showed satisfactorily agreement between the model and the experiment. This analysis also showed the importance of the proposed combustion rate model with simultaneous influence of both chemical kinetics and turbulent effects. (c) 2005 Elsevier Ltd. All rights reserved.
T2  - International Journal of Heat and Mass Transfer
T1  - Experimental and numerical investigation of gaseous fuel combustion in swirl chamber
VL  - 48
IS  - 21-22
SP  - 4623
EP  - 4632
DO  - 10.1016/j.ijheatmasstransfer.2005.04.004
ER  - 
@article{
author = "Nemoda, Stevan and Bakić, Vukman and Oka, Simeon N. and Živković, Goran S. and Crnomarković, Nenad Đ.",
year = "2005",
abstract = "In this paper the results of experimental and numerical investigations of swirl burner were presented. Mathematical model for prediction of velocity, temperature and concentration fields of axisymmetrical confined swirl turbulent flame was developed. Model consists of few mutually coupled segments related to basic processes in turbulent flows with combustion. The original combustion rate model based on the ideal reacting hypothesis within fine structure of turbulence was applied. The comparison of the experimental results with computation showed satisfactorily agreement between the model and the experiment. This analysis also showed the importance of the proposed combustion rate model with simultaneous influence of both chemical kinetics and turbulent effects. (c) 2005 Elsevier Ltd. All rights reserved.",
journal = "International Journal of Heat and Mass Transfer",
title = "Experimental and numerical investigation of gaseous fuel combustion in swirl chamber",
volume = "48",
number = "21-22",
pages = "4623-4632",
doi = "10.1016/j.ijheatmasstransfer.2005.04.004"
}
Nemoda, S., Bakić, V., Oka, S. N., Živković, G. S.,& Crnomarković, N. Đ.. (2005). Experimental and numerical investigation of gaseous fuel combustion in swirl chamber. in International Journal of Heat and Mass Transfer, 48(21-22), 4623-4632.
https://doi.org/10.1016/j.ijheatmasstransfer.2005.04.004
Nemoda S, Bakić V, Oka SN, Živković GS, Crnomarković NĐ. Experimental and numerical investigation of gaseous fuel combustion in swirl chamber. in International Journal of Heat and Mass Transfer. 2005;48(21-22):4623-4632.
doi:10.1016/j.ijheatmasstransfer.2005.04.004 .
Nemoda, Stevan, Bakić, Vukman, Oka, Simeon N., Živković, Goran S., Crnomarković, Nenad Đ., "Experimental and numerical investigation of gaseous fuel combustion in swirl chamber" in International Journal of Heat and Mass Transfer, 48, no. 21-22 (2005):4623-4632,
https://doi.org/10.1016/j.ijheatmasstransfer.2005.04.004 . .
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