TY  - CONF
AU  - Milićević, Aleksandar
AU  - Belošević, Srđan
AU  - Erić, Milić
AU  - Marković, Zoran
AU  - Tomanović, Ivan
AU  - Crnomarković, Nenad
AU  - Stojanović, Andrijana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12766
AB  - Heating value is an important indicator for assessment of the coal quality. Machine learning models are powerful computational tools that allow for the analysis of various heat and mass transfer phenomena in energy systems. In this paper, Random forest model for determining the lower heating values of coal from the thermal power plant “Kolubara A” is developed based on proximate and ultimate fuel analysis. A database of the proximate and ultimate fuel analysis values and lower heating value of coal was created by experimental measurements in the accredited test laboratory of the Department of Thermal Engineering and Energy (“VINČA” Institute of Nuclear Sciences). The developed Random forest models, applied to a relatively small database, showed acceptable predictions for the lower heating value based on both the proximate analysis (RMSE = 0.22 MJ/kg and MAPE = 2.26%) and the ultimate analysis (RMSE = 0.64 MJ/kg and MAPE = 6.12%), with better accuracy achieved by the model whose input data consisted of the values of technical fuel analysis.
PB  - Belgrade : Society of Thermal Engineers of Serbia
C3  - International Conference Power Plants 2023 : Proceedings
T1  - Random forest model for determination of the lower heating value of TPP “Kolubara A” coal
SP  - 748
EP  - 752
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12766
ER  - 

@conference{
author = "Milićević, Aleksandar and Belošević, Srđan and Erić, Milić and Marković, Zoran and Tomanović, Ivan and Crnomarković, Nenad and Stojanović, Andrijana",
year = "2023",
abstract = "Heating value is an important indicator for assessment of the coal quality. Machine learning models are powerful computational tools that allow for the analysis of various heat and mass transfer phenomena in energy systems. In this paper, Random forest model for determining the lower heating values of coal from the thermal power plant “Kolubara A” is developed based on proximate and ultimate fuel analysis. A database of the proximate and ultimate fuel analysis values and lower heating value of coal was created by experimental measurements in the accredited test laboratory of the Department of Thermal Engineering and Energy (“VINČA” Institute of Nuclear Sciences). The developed Random forest models, applied to a relatively small database, showed acceptable predictions for the lower heating value based on both the proximate analysis (RMSE = 0.22 MJ/kg and MAPE = 2.26%) and the ultimate analysis (RMSE = 0.64 MJ/kg and MAPE = 6.12%), with better accuracy achieved by the model whose input data consisted of the values of technical fuel analysis.",
publisher = "Belgrade : Society of Thermal Engineers of Serbia",
journal = "International Conference Power Plants 2023 : Proceedings",
title = "Random forest model for determination of the lower heating value of TPP “Kolubara A” coal",
pages = "748-752",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12766"
}

Milićević, A., Belošević, S., Erić, M., Marković, Z., Tomanović, I., Crnomarković, N.,& Stojanović, A.. (2023). Random forest model for determination of the lower heating value of TPP “Kolubara A” coal. in International Conference Power Plants 2023 : Proceedings
Belgrade : Society of Thermal Engineers of Serbia., 748-752.
https://hdl.handle.net/21.15107/rcub_vinar_12766

Milićević A, Belošević S, Erić M, Marković Z, Tomanović I, Crnomarković N, Stojanović A. Random forest model for determination of the lower heating value of TPP “Kolubara A” coal. in International Conference Power Plants 2023 : Proceedings. 2023;:748-752.
https://hdl.handle.net/21.15107/rcub_vinar_12766 .

Milićević, Aleksandar, Belošević, Srđan, Erić, Milić, Marković, Zoran, Tomanović, Ivan, Crnomarković, Nenad, Stojanović, Andrijana, "Random forest model for determination of the lower heating value of TPP “Kolubara A” coal" in International Conference Power Plants 2023 : Proceedings (2023):748-752,
https://hdl.handle.net/21.15107/rcub_vinar_12766 .

TY  - CONF
AU  - Tomanović, Ivan
AU  - Belošević, Srđan
AU  - Milićević, Aleksandar
AU  - Crnomarković, Nenad
AU  - Stojanović, Andrijana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12768
AB  - The development of both CPUs and GPUs slowly moved towards the multi-core processors at the start of this century, allowing for true execution of several applications in parallel, or running a single task over multiple threads. This was especially true when considering the affordable and widely available units. The development of powerful GPUs, helped brew an idea in scientific circles to process large and scalable matrices containing mostly non graphical data on the GPUs, the same way they are processing the textures, utilizing the advantage of concurrent execution of many simple operations. Recent advances allowed for even easier and more accessible utilization of new hardware by both the scientific circles and the public in general through the development of new programming tools, languages, and language extensions. In this paper we analyze the structure of an in-house CFD code developed for coal-fired boiler furnace simulations, with an idea to suggest an optimal algorithm structure that would allow this code to run on many-core architectures. This is an interesting task, especially given the recent increase in GPU computational abilities, led to the availability of powerful and affordable workstations capable of processing large data sets. Here we analyze the algorithm for a single thread optimized code, identifying potential problems and recursive dependencies, and suggest the structure that would allow movement towards the parallel versions of existing code and its execution on both multi- and many-core architectures. Goal of this analysis is to identify and understand the inherently recursive portions of the code that should undergo modifications to allow for fully parallel executions in future efficient simulations of boiler furnaces.
PB  - Belgrade : Society of Thermal Engineers of Serbia
C3  - International Conference Power Plants 2023 : Proceedings
T1  - Possibilities for parallel computations in utility scale furnace: The code structure analysis
SP  - 763
EP  - 771
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12768
ER  - 

@conference{
author = "Tomanović, Ivan and Belošević, Srđan and Milićević, Aleksandar and Crnomarković, Nenad and Stojanović, Andrijana",
year = "2023",
abstract = "The development of both CPUs and GPUs slowly moved towards the multi-core processors at the start of this century, allowing for true execution of several applications in parallel, or running a single task over multiple threads. This was especially true when considering the affordable and widely available units. The development of powerful GPUs, helped brew an idea in scientific circles to process large and scalable matrices containing mostly non graphical data on the GPUs, the same way they are processing the textures, utilizing the advantage of concurrent execution of many simple operations. Recent advances allowed for even easier and more accessible utilization of new hardware by both the scientific circles and the public in general through the development of new programming tools, languages, and language extensions. In this paper we analyze the structure of an in-house CFD code developed for coal-fired boiler furnace simulations, with an idea to suggest an optimal algorithm structure that would allow this code to run on many-core architectures. This is an interesting task, especially given the recent increase in GPU computational abilities, led to the availability of powerful and affordable workstations capable of processing large data sets. Here we analyze the algorithm for a single thread optimized code, identifying potential problems and recursive dependencies, and suggest the structure that would allow movement towards the parallel versions of existing code and its execution on both multi- and many-core architectures. Goal of this analysis is to identify and understand the inherently recursive portions of the code that should undergo modifications to allow for fully parallel executions in future efficient simulations of boiler furnaces.",
publisher = "Belgrade : Society of Thermal Engineers of Serbia",
journal = "International Conference Power Plants 2023 : Proceedings",
title = "Possibilities for parallel computations in utility scale furnace: The code structure analysis",
pages = "763-771",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12768"
}

Tomanović, I., Belošević, S., Milićević, A., Crnomarković, N.,& Stojanović, A.. (2023). Possibilities for parallel computations in utility scale furnace: The code structure analysis. in International Conference Power Plants 2023 : Proceedings
Belgrade : Society of Thermal Engineers of Serbia., 763-771.
https://hdl.handle.net/21.15107/rcub_vinar_12768

Tomanović I, Belošević S, Milićević A, Crnomarković N, Stojanović A. Possibilities for parallel computations in utility scale furnace: The code structure analysis. in International Conference Power Plants 2023 : Proceedings. 2023;:763-771.
https://hdl.handle.net/21.15107/rcub_vinar_12768 .

Tomanović, Ivan, Belošević, Srđan, Milićević, Aleksandar, Crnomarković, Nenad, Stojanović, Andrijana, "Possibilities for parallel computations in utility scale furnace: The code structure analysis" in International Conference Power Plants 2023 : Proceedings (2023):763-771,
https://hdl.handle.net/21.15107/rcub_vinar_12768 .

TY  - JOUR
AU  - Crnomarković, Nenad
AU  - Belošević, Srđan
AU  - Tomanović, Ivan
AU  - Milićević, Aleksandar
AU  - Stojanović, Andrijana
AU  - Tucaković, Dragan
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12245
AB  - In this paper, influence of the temperature fluctuations, (as a version of turbulence-radiation interaction), on the flame temperature and radiative heat exchange inside the pulverized coal-fired furnace was investigated. The radiative heat exchange was solved by the Hottel zonal model. The influence of the temperature fluctuation was studied for three values of the extinction coefficient of the flame: 0.3 m?1, 1.0 m?1, and 2.0 m?1. The investigation was conducted for the relative temperature fluctuations obtained by solving the transport equation for the temperature variance, and for four constant values of the relative temperature fluctuations (0.0, 0.1, 0.15, and 0.2). The maximal values of the mean temperature fluctuations and relative temperature fluctuations were obtained in the region close to the burners. The decrease of the flame temperature of about 100 K was obtained in the hottest region, for every extinction coefficient. An increase in the mean wall flux was found to be on the order of several percents, compared to the case without the temperature fluctuations. When the temperature variance was calculated, the mean relative temperature fluctuations were approximately 15%, for every extinction coefficient. The mean wall fluxes increased and flame temperature at the furnace exit plane decreased with the increase in the relative temperature fluctuations. The selected indicators of the furnace operation, such as the mean wall flux and mean flame temperature at the furnace exit plane, obtained for the calculated temperature variance, were close to the values predicted for the constant relative temperature fluctuation of 15%.
T2  - Thermal Science
T1  - Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace
VL  - 27
IS  - 6 Part A
SP  - 4539
EP  - 4549
DO  - 10.2298/TSCI230609173C
ER  - 

@article{
author = "Crnomarković, Nenad and Belošević, Srđan and Tomanović, Ivan and Milićević, Aleksandar and Stojanović, Andrijana and Tucaković, Dragan",
year = "2023",
abstract = "In this paper, influence of the temperature fluctuations, (as a version of turbulence-radiation interaction), on the flame temperature and radiative heat exchange inside the pulverized coal-fired furnace was investigated. The radiative heat exchange was solved by the Hottel zonal model. The influence of the temperature fluctuation was studied for three values of the extinction coefficient of the flame: 0.3 m?1, 1.0 m?1, and 2.0 m?1. The investigation was conducted for the relative temperature fluctuations obtained by solving the transport equation for the temperature variance, and for four constant values of the relative temperature fluctuations (0.0, 0.1, 0.15, and 0.2). The maximal values of the mean temperature fluctuations and relative temperature fluctuations were obtained in the region close to the burners. The decrease of the flame temperature of about 100 K was obtained in the hottest region, for every extinction coefficient. An increase in the mean wall flux was found to be on the order of several percents, compared to the case without the temperature fluctuations. When the temperature variance was calculated, the mean relative temperature fluctuations were approximately 15%, for every extinction coefficient. The mean wall fluxes increased and flame temperature at the furnace exit plane decreased with the increase in the relative temperature fluctuations. The selected indicators of the furnace operation, such as the mean wall flux and mean flame temperature at the furnace exit plane, obtained for the calculated temperature variance, were close to the values predicted for the constant relative temperature fluctuation of 15%.",
journal = "Thermal Science",
title = "Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace",
volume = "27",
number = "6 Part A",
pages = "4539-4549",
doi = "10.2298/TSCI230609173C"
}

Crnomarković, N., Belošević, S., Tomanović, I., Milićević, A., Stojanović, A.,& Tucaković, D.. (2023). Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace. in Thermal Science, 27(6 Part A), 4539-4549.
https://doi.org/10.2298/TSCI230609173C

Crnomarković N, Belošević S, Tomanović I, Milićević A, Stojanović A, Tucaković D. Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace. in Thermal Science. 2023;27(6 Part A):4539-4549.
doi:10.2298/TSCI230609173C .

Crnomarković, Nenad, Belošević, Srđan, Tomanović, Ivan, Milićević, Aleksandar, Stojanović, Andrijana, Tucaković, Dragan, "Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace" in Thermal Science, 27, no. 6 Part A (2023):4539-4549,
https://doi.org/10.2298/TSCI230609173C . .

TY  - JOUR
AU  - Milićević, Aleksandar
AU  - Belošević, Srđan
AU  - Žarković, Mileta
AU  - Tomanović, Ivan
AU  - Crnomarković, Nenad
AU  - Stojanović, Andrijana
AU  - Stupar, Goran
AU  - Deng, Lei
AU  - Che, Defu
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11021
AB  - When planning the development of the energy sector, significant attention is given to the energy from the renewable sources, amongst which the biomass has an important role. Computational fluid mechanics and machine learning models are the powerful and efficient tools which allow the analysis of various heat and mass transfer phenomena in energy facilities. In this study, the in-house developed CFD code and machine learning models (Random Forest, Gradient Boosting and Artificial Neural Network) for predicting the biomass trajectories, particle mass burnout and residence time in a swirl burner reactor are presented. Pulverized biomass combustion cases (fine straw, pinewood and switch grass) with various mean diameters (ranging between 60 and 650 μm) and different shape factors (within the range 0–1) are considered. The results of numerical simulations revealed a noticeably nonlinear dependence between the input values (particle types, sizes and shapes) and the output values (particle trajectories, mass burnout and residence time), mostly due to the complex swirling flow in the reactor. For particles with the mean diameters within the ranges considered, the mass burnout of particles generally decreases as the biomass particle shape factor increases. The residence time of pulverized biomass in the reactor shows in most cases a decreasing trend as the particle shape factor increases. Artificial Neural Network showed the best predictions for both particle mass burnout (RMSE = 0.083 and R2 = 0.937) and particle residence time (RMSE = 1.145 s and R2 = 0.900), providing the reliable assessment of these important indicators in the combustion process.
T2  - Biomass and Bioenergy
T1  - Effects of biomass particles size and shape on combustion process in the swirl-stabilized burner reactor: CFD and machine learning approach
VL  - 174
SP  - 106817
DO  - 10.1016/j.biombioe.2023.106817
ER  - 

@article{
author = "Milićević, Aleksandar and Belošević, Srđan and Žarković, Mileta and Tomanović, Ivan and Crnomarković, Nenad and Stojanović, Andrijana and Stupar, Goran and Deng, Lei and Che, Defu",
year = "2023",
abstract = "When planning the development of the energy sector, significant attention is given to the energy from the renewable sources, amongst which the biomass has an important role. Computational fluid mechanics and machine learning models are the powerful and efficient tools which allow the analysis of various heat and mass transfer phenomena in energy facilities. In this study, the in-house developed CFD code and machine learning models (Random Forest, Gradient Boosting and Artificial Neural Network) for predicting the biomass trajectories, particle mass burnout and residence time in a swirl burner reactor are presented. Pulverized biomass combustion cases (fine straw, pinewood and switch grass) with various mean diameters (ranging between 60 and 650 μm) and different shape factors (within the range 0–1) are considered. The results of numerical simulations revealed a noticeably nonlinear dependence between the input values (particle types, sizes and shapes) and the output values (particle trajectories, mass burnout and residence time), mostly due to the complex swirling flow in the reactor. For particles with the mean diameters within the ranges considered, the mass burnout of particles generally decreases as the biomass particle shape factor increases. The residence time of pulverized biomass in the reactor shows in most cases a decreasing trend as the particle shape factor increases. Artificial Neural Network showed the best predictions for both particle mass burnout (RMSE = 0.083 and R2 = 0.937) and particle residence time (RMSE = 1.145 s and R2 = 0.900), providing the reliable assessment of these important indicators in the combustion process.",
journal = "Biomass and Bioenergy",
title = "Effects of biomass particles size and shape on combustion process in the swirl-stabilized burner reactor: CFD and machine learning approach",
volume = "174",
pages = "106817",
doi = "10.1016/j.biombioe.2023.106817"
}

Milićević, A., Belošević, S., Žarković, M., Tomanović, I., Crnomarković, N., Stojanović, A., Stupar, G., Deng, L.,& Che, D.. (2023). Effects of biomass particles size and shape on combustion process in the swirl-stabilized burner reactor: CFD and machine learning approach. in Biomass and Bioenergy, 174, 106817.
https://doi.org/10.1016/j.biombioe.2023.106817

Milićević A, Belošević S, Žarković M, Tomanović I, Crnomarković N, Stojanović A, Stupar G, Deng L, Che D. Effects of biomass particles size and shape on combustion process in the swirl-stabilized burner reactor: CFD and machine learning approach. in Biomass and Bioenergy. 2023;174:106817.
doi:10.1016/j.biombioe.2023.106817 .

Milićević, Aleksandar, Belošević, Srđan, Žarković, Mileta, Tomanović, Ivan, Crnomarković, Nenad, Stojanović, Andrijana, Stupar, Goran, Deng, Lei, Che, Defu, "Effects of biomass particles size and shape on combustion process in the swirl-stabilized burner reactor: CFD and machine learning approach" in Biomass and Bioenergy, 174 (2023):106817,
https://doi.org/10.1016/j.biombioe.2023.106817 . .

TY  - CONF
AU  - Stojanović, Andrijana
AU  - Crnomarković, Nenad
AU  - Milićević, Aleksandar
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12292
PB  - Niš : University of Niš, Faculty of Mechanical Engineering
C3  - SimTerm2022 : 20th international conference on thermal science and engineering of Serbia : Proceedings
T1  - The Optimal Uses of Biomass for Electricity and Fuel Production
SP  - 112
EP  - 117
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12292
ER  - 

@conference{
author = "Stojanović, Andrijana and Crnomarković, Nenad and Milićević, Aleksandar",
year = "2022",
publisher = "Niš : University of Niš, Faculty of Mechanical Engineering",
journal = "SimTerm2022 : 20th international conference on thermal science and engineering of Serbia : Proceedings",
title = "The Optimal Uses of Biomass for Electricity and Fuel Production",
pages = "112-117",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12292"
}

Stojanović, A., Crnomarković, N.,& Milićević, A.. (2022). The Optimal Uses of Biomass for Electricity and Fuel Production. in SimTerm2022 : 20th international conference on thermal science and engineering of Serbia : Proceedings
Niš : University of Niš, Faculty of Mechanical Engineering., 112-117.
https://hdl.handle.net/21.15107/rcub_vinar_12292

Stojanović A, Crnomarković N, Milićević A. The Optimal Uses of Biomass for Electricity and Fuel Production. in SimTerm2022 : 20th international conference on thermal science and engineering of Serbia : Proceedings. 2022;:112-117.
https://hdl.handle.net/21.15107/rcub_vinar_12292 .

Stojanović, Andrijana, Crnomarković, Nenad, Milićević, Aleksandar, "The Optimal Uses of Biomass for Electricity and Fuel Production" in SimTerm2022 : 20th international conference on thermal science and engineering of Serbia : Proceedings (2022):112-117,
https://hdl.handle.net/21.15107/rcub_vinar_12292 .

TY  - JOUR
AU  - Crnomarković, Nenad Đ.
AU  - Belošević, Srđan
AU  - Nemoda, Stevan
AU  - Tomanović, Ivan
AU  - Milićević, Aleksandar
AU  - Stojanović, Andrijana D.
AU  - Stupar, Goran
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10754
AB  - The pulverized coal-fired furnaces are expected to use co-firing withbiomass for environmental reasons. Although the non-uniform ash depositsare formed on the furnace walls, the uniform deposits could be used for theanalysis of the furnace operation. The objective of this investigation wasdetermination of the uniform deposit thickness, used as a criterion forprediction of the sootblower activation moment in coal-biomass co-firing.The investigation comprised numerical simulations for uniform and nonuniform deposits to find the relative differences for the selected variablesthat were important for the sootblower activation: the mean wall fluxes andflame temperatures. The local thicknesses of the non-uniform deposits weredetermined by the gamma distribution for several mean and standarddeviation values using the inversion method. The thicknesses of the uniformdeposits were considered among the measures of central tendency: mode,mean, and median, of the non-uniform deposits. The mean was expected toprovide the smallest relative differences, while the mode was excluded fromfurther consideration after analysis of its values. The median was found tobe better choice than the mean, as it provided smaller relative differences ofthe selected variables for the thick deposits, which were important for thesootblower activation. The method based on comparison of the uniformdeposits for coal firing and those for the co-firing with biomass wasproposed for the prediction of the sootblower activation moment. Themethod can be used for the selection of the operational regimes for coalbiomass co-firing.
T2  - Thermal Science
T1  - Determination of the Sootblower Activation Moment for Biomass Co-Firing in a Pulverized Coal Furnace
VL  - 27
IS  - 1 Part B
SP  - 755
EP  - 766
DO  - 10.2298/TSCI220516149C
ER  - 

@article{
author = "Crnomarković, Nenad Đ. and Belošević, Srđan and Nemoda, Stevan and Tomanović, Ivan and Milićević, Aleksandar and Stojanović, Andrijana D. and Stupar, Goran",
year = "2022",
abstract = "The pulverized coal-fired furnaces are expected to use co-firing withbiomass for environmental reasons. Although the non-uniform ash depositsare formed on the furnace walls, the uniform deposits could be used for theanalysis of the furnace operation. The objective of this investigation wasdetermination of the uniform deposit thickness, used as a criterion forprediction of the sootblower activation moment in coal-biomass co-firing.The investigation comprised numerical simulations for uniform and nonuniform deposits to find the relative differences for the selected variablesthat were important for the sootblower activation: the mean wall fluxes andflame temperatures. The local thicknesses of the non-uniform deposits weredetermined by the gamma distribution for several mean and standarddeviation values using the inversion method. The thicknesses of the uniformdeposits were considered among the measures of central tendency: mode,mean, and median, of the non-uniform deposits. The mean was expected toprovide the smallest relative differences, while the mode was excluded fromfurther consideration after analysis of its values. The median was found tobe better choice than the mean, as it provided smaller relative differences ofthe selected variables for the thick deposits, which were important for thesootblower activation. The method based on comparison of the uniformdeposits for coal firing and those for the co-firing with biomass wasproposed for the prediction of the sootblower activation moment. Themethod can be used for the selection of the operational regimes for coalbiomass co-firing.",
journal = "Thermal Science",
title = "Determination of the Sootblower Activation Moment for Biomass Co-Firing in a Pulverized Coal Furnace",
volume = "27",
number = "1 Part B",
pages = "755-766",
doi = "10.2298/TSCI220516149C"
}

Crnomarković, N. Đ., Belošević, S., Nemoda, S., Tomanović, I., Milićević, A., Stojanović, A. D.,& Stupar, G.. (2022). Determination of the Sootblower Activation Moment for Biomass Co-Firing in a Pulverized Coal Furnace. in Thermal Science, 27(1 Part B), 755-766.
https://doi.org/10.2298/TSCI220516149C

Crnomarković NĐ, Belošević S, Nemoda S, Tomanović I, Milićević A, Stojanović AD, Stupar G. Determination of the Sootblower Activation Moment for Biomass Co-Firing in a Pulverized Coal Furnace. in Thermal Science. 2022;27(1 Part B):755-766.
doi:10.2298/TSCI220516149C .

Crnomarković, Nenad Đ., Belošević, Srđan, Nemoda, Stevan, Tomanović, Ivan, Milićević, Aleksandar, Stojanović, Andrijana D., Stupar, Goran, "Determination of the Sootblower Activation Moment for Biomass Co-Firing in a Pulverized Coal Furnace" in Thermal Science, 27, no. 1 Part B (2022):755-766,
https://doi.org/10.2298/TSCI220516149C . .

TY  - JOUR
AU  - Stojanović, Andrijana D.
AU  - Belošević, Srđan
AU  - Crnomarković, Nenad Đ.
AU  - Tomanović, Ivan D.
AU  - Milićević, Aleksandar
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10177
AB  - Understanding nucleate pool boiling heat transfer and, in particular the accurate prediction of conditions that can lead to critical heat flux, is of the utmost importance in many industries. Due to the safety issues related to the nuclear power plants, and for the efficient operation of many heat transfer units including fossil fuel boilers, fusion reactors, electronic chips, etc., it is important to understand this kind of heat transfer. In this paper, a comprehensive review of analytical and numerical work on nucleate pool boiling heat transfer is presented. In order to understand this phenomenon, existing studies on boiling heat transfer coefficient and boiling heat flux are also discussed, as well as characteristics of boiling phenomena such as bubble departure diameter, bubble departure frequency, active nucleation site density, bubble waiting and growth period and their impact on pool boiling heat transfer.
T2  - Thermal Science
T1  - Nucleate pool boiling heat transfer: Review of models and bubble dynamics parameters
VL  - 26
IS  - 1 Part A
SP  - 157
EP  - 174
DO  - 10.2298/TSCI200111069S
ER  - 

@article{
author = "Stojanović, Andrijana D. and Belošević, Srđan and Crnomarković, Nenad Đ. and Tomanović, Ivan D. and Milićević, Aleksandar",
year = "2022",
abstract = "Understanding nucleate pool boiling heat transfer and, in particular the accurate prediction of conditions that can lead to critical heat flux, is of the utmost importance in many industries. Due to the safety issues related to the nuclear power plants, and for the efficient operation of many heat transfer units including fossil fuel boilers, fusion reactors, electronic chips, etc., it is important to understand this kind of heat transfer. In this paper, a comprehensive review of analytical and numerical work on nucleate pool boiling heat transfer is presented. In order to understand this phenomenon, existing studies on boiling heat transfer coefficient and boiling heat flux are also discussed, as well as characteristics of boiling phenomena such as bubble departure diameter, bubble departure frequency, active nucleation site density, bubble waiting and growth period and their impact on pool boiling heat transfer.",
journal = "Thermal Science",
title = "Nucleate pool boiling heat transfer: Review of models and bubble dynamics parameters",
volume = "26",
number = "1 Part A",
pages = "157-174",
doi = "10.2298/TSCI200111069S"
}

Stojanović, A. D., Belošević, S., Crnomarković, N. Đ., Tomanović, I. D.,& Milićević, A.. (2022). Nucleate pool boiling heat transfer: Review of models and bubble dynamics parameters. in Thermal Science, 26(1 Part A), 157-174.
https://doi.org/10.2298/TSCI200111069S

Stojanović AD, Belošević S, Crnomarković NĐ, Tomanović ID, Milićević A. Nucleate pool boiling heat transfer: Review of models and bubble dynamics parameters. in Thermal Science. 2022;26(1 Part A):157-174.
doi:10.2298/TSCI200111069S .

Stojanović, Andrijana D., Belošević, Srđan, Crnomarković, Nenad Đ., Tomanović, Ivan D., Milićević, Aleksandar, "Nucleate pool boiling heat transfer: Review of models and bubble dynamics parameters" in Thermal Science, 26, no. 1 Part A (2022):157-174,
https://doi.org/10.2298/TSCI200111069S . .

TY  - JOUR
AU  - Milićević, Aleksandar
AU  - Belošević, Srđan
AU  - Crnomarković, Nenad Đ.
AU  - Tomanović, Ivan D.
AU  - Stojanović, Andrijana D.
AU  - Tucaković, Dragan
AU  - Lei Deng
AU  - Che, Defu
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9916
AB  - The co-combustion of biomass and coal in a utility boiler could provide cleaner power production and ensure sustainable utilization of the solid fuels. This paper aims to numerically investigate complex processes in the tangentially-fired 900 MWth boiler furnace during direct co-firing of lignite and biomass with 10% thermal share of agricultural residues (wheat straw, corn straw and soybean straw) under variable boiler loads (100%, 85% and 70%). Simulations are conducted by means of in-house developed computer code, supported by the specially designed user-friendly graphical interface. Co-firing of agricultural residues provides lower pollutant emissions, somewhat higher furnace exit gas temperature and increase in unburnt carbon in bottom/fly ash, compared to the lignite combustion without biomass. Soybean is found to be the most suitable for co-firing regarding its ash melting point, however due to its abundance and availability the wheat straw is selected for this study. Co-combustion at partial boiler loads results in reduction of NOx and SOx up to 34% and 9.5%, respectively. Burners arrangement and furnace aerodynamics affect the abatement of pollutants. This study may help the global efforts in fighting the climate change, efficiently and cost-effectively, thus offering considerable economic and social benefits.
T2  - International Journal of Heat and Mass Transfer
T1  - Numerical study of co-firing lignite and agricultural biomass in utility boiler under variable operation conditions
VL  - 181
SP  - 121728
DO  - 10.1016/j.ijheatmasstransfer.2021.121728
ER  - 

@article{
author = "Milićević, Aleksandar and Belošević, Srđan and Crnomarković, Nenad Đ. and Tomanović, Ivan D. and Stojanović, Andrijana D. and Tucaković, Dragan and Lei Deng and Che, Defu",
year = "2021",
abstract = "The co-combustion of biomass and coal in a utility boiler could provide cleaner power production and ensure sustainable utilization of the solid fuels. This paper aims to numerically investigate complex processes in the tangentially-fired 900 MWth boiler furnace during direct co-firing of lignite and biomass with 10% thermal share of agricultural residues (wheat straw, corn straw and soybean straw) under variable boiler loads (100%, 85% and 70%). Simulations are conducted by means of in-house developed computer code, supported by the specially designed user-friendly graphical interface. Co-firing of agricultural residues provides lower pollutant emissions, somewhat higher furnace exit gas temperature and increase in unburnt carbon in bottom/fly ash, compared to the lignite combustion without biomass. Soybean is found to be the most suitable for co-firing regarding its ash melting point, however due to its abundance and availability the wheat straw is selected for this study. Co-combustion at partial boiler loads results in reduction of NOx and SOx up to 34% and 9.5%, respectively. Burners arrangement and furnace aerodynamics affect the abatement of pollutants. This study may help the global efforts in fighting the climate change, efficiently and cost-effectively, thus offering considerable economic and social benefits.",
journal = "International Journal of Heat and Mass Transfer",
title = "Numerical study of co-firing lignite and agricultural biomass in utility boiler under variable operation conditions",
volume = "181",
pages = "121728",
doi = "10.1016/j.ijheatmasstransfer.2021.121728"
}

Milićević, A., Belošević, S., Crnomarković, N. Đ., Tomanović, I. D., Stojanović, A. D., Tucaković, D., Lei Deng,& Che, D.. (2021). Numerical study of co-firing lignite and agricultural biomass in utility boiler under variable operation conditions. in International Journal of Heat and Mass Transfer, 181, 121728.
https://doi.org/10.1016/j.ijheatmasstransfer.2021.121728

Milićević A, Belošević S, Crnomarković NĐ, Tomanović ID, Stojanović AD, Tucaković D, Lei Deng, Che D. Numerical study of co-firing lignite and agricultural biomass in utility boiler under variable operation conditions. in International Journal of Heat and Mass Transfer. 2021;181:121728.
doi:10.1016/j.ijheatmasstransfer.2021.121728 .

Milićević, Aleksandar, Belošević, Srđan, Crnomarković, Nenad Đ., Tomanović, Ivan D., Stojanović, Andrijana D., Tucaković, Dragan, Lei Deng, Che, Defu, "Numerical study of co-firing lignite and agricultural biomass in utility boiler under variable operation conditions" in International Journal of Heat and Mass Transfer, 181 (2021):121728,
https://doi.org/10.1016/j.ijheatmasstransfer.2021.121728 . .

TY  - JOUR
AU  - Stojanović, Andrijana D.
AU  - Belošević, Srđan
AU  - Crnomarković, Nenad Đ.
AU  - Tomanović, Ivan
AU  - Milićević, Aleksandar
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10276
AB  - Due to extensive research efforts within the past thirty years, the mechanisms by which bubbles transfer energy during pool boiling are relatively well understood and have various applications in reactors, rockets, distillation, air separation, refrigeration and power cycles. In this paper, CFD analysis of heat transfer characteristics in nucleate pool boiling of saturated water in atmospheric conditions is performed in order to find out the influence of heat flux intensity on pool boiling dynamics. The investigation is carried out for four cases of different heat flux intensities and obtained results for velocity fields of liquid and void fractions are discussed. Grid independent test is also performed to improve the accuracy of calculation. In this way, complete picture of two-phase mixture behaviour on heated wall is represented.
T2  - Journal of the Serbian Society for Computational Mechanics
T1  - Heat Transfer to a Boiling Liquid – Numerical Study
VL  - 15
IS  - 1
SP  - 177
EP  - 185
DO  - 10.24874/jsscm.2021.15.01.12
ER  - 

@article{
author = "Stojanović, Andrijana D. and Belošević, Srđan and Crnomarković, Nenad Đ. and Tomanović, Ivan and Milićević, Aleksandar",
year = "2021",
abstract = "Due to extensive research efforts within the past thirty years, the mechanisms by which bubbles transfer energy during pool boiling are relatively well understood and have various applications in reactors, rockets, distillation, air separation, refrigeration and power cycles. In this paper, CFD analysis of heat transfer characteristics in nucleate pool boiling of saturated water in atmospheric conditions is performed in order to find out the influence of heat flux intensity on pool boiling dynamics. The investigation is carried out for four cases of different heat flux intensities and obtained results for velocity fields of liquid and void fractions are discussed. Grid independent test is also performed to improve the accuracy of calculation. In this way, complete picture of two-phase mixture behaviour on heated wall is represented.",
journal = "Journal of the Serbian Society for Computational Mechanics",
title = "Heat Transfer to a Boiling Liquid – Numerical Study",
volume = "15",
number = "1",
pages = "177-185",
doi = "10.24874/jsscm.2021.15.01.12"
}

Stojanović, A. D., Belošević, S., Crnomarković, N. Đ., Tomanović, I.,& Milićević, A.. (2021). Heat Transfer to a Boiling Liquid – Numerical Study. in Journal of the Serbian Society for Computational Mechanics, 15(1), 177-185.
https://doi.org/10.24874/jsscm.2021.15.01.12

Stojanović AD, Belošević S, Crnomarković NĐ, Tomanović I, Milićević A. Heat Transfer to a Boiling Liquid – Numerical Study. in Journal of the Serbian Society for Computational Mechanics. 2021;15(1):177-185.
doi:10.24874/jsscm.2021.15.01.12 .

Stojanović, Andrijana D., Belošević, Srđan, Crnomarković, Nenad Đ., Tomanović, Ivan, Milićević, Aleksandar, "Heat Transfer to a Boiling Liquid – Numerical Study" in Journal of the Serbian Society for Computational Mechanics, 15, no. 1 (2021):177-185,
https://doi.org/10.24874/jsscm.2021.15.01.12 . .

Crnomarković, N., Belošević, S., Tomanović, I., Milićević, A.,& Stojanović, A.. (2020). Numerički kod za korekciju emisivnosti površinskih zona Hottel-ovog zonalnog modela razmene toplote zračenjem u ložištu sa sagorevanjem ugljenog praha. in Institut za nuklearne nauke Vinča : Laboratorija za termotehniku i energetiku
Univerzitet u Beogradu, Institut za nuklearne nauke "Vinča", Institut od nacionalnog značaja za Republiku Srbiju..
https://hdl.handle.net/21.15107/rcub_vinar_12290

Crnomarković N, Belošević S, Tomanović I, Milićević A, Stojanović A. Numerički kod za korekciju emisivnosti površinskih zona Hottel-ovog zonalnog modela razmene toplote zračenjem u ložištu sa sagorevanjem ugljenog praha. in Institut za nuklearne nauke Vinča : Laboratorija za termotehniku i energetiku. 2020;.
https://hdl.handle.net/21.15107/rcub_vinar_12290 .

Crnomarković, Nenad, Belošević, Srđan, Tomanović, Ivan, Milićević, Aleksandar, Stojanović, Andrijana, "Numerički kod za korekciju emisivnosti površinskih zona Hottel-ovog zonalnog modela razmene toplote zračenjem u ložištu sa sagorevanjem ugljenog praha" in Institut za nuklearne nauke Vinča : Laboratorija za termotehniku i energetiku (2020),
https://hdl.handle.net/21.15107/rcub_vinar_12290 .

TY  - JOUR
AU  - Stanković, Branislav D.
AU  - Belošević, Srđan
AU  - Crnomarković, Nenad Đ.
AU  - Stojanović, Andrijana D.
AU  - Tomanović, Ivan D.
AU  - Milićević, Aleksandar
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7188
AB  - The essential ideas of investigations of turbulent flow in a straight rectangular duct are chronologically presented. Fundamentally significant experimental and theoretical studies for mathematical modeling and numerical computations of this flow configuration are analyzed. An important physical aspect of this type of flow is presence of secondary motion in the plane perpendicular to the streamwise direction, which is of interest from both the engineering and the scientific viewpoints. The key facts for a task of turbulence modeling and optimal choice of the turbulence model are obtained through careful examination of physical mechanisms that generate secondary flows.
T2  - Thermal Science
T1  - Specific Aspects of Turbulent Flow in Rectangular Ducts
VL  - 21
SP  - S663
EP  - S678
DO  - 10.2298/TSCI160201189S
ER  - 

@article{
author = "Stanković, Branislav D. and Belošević, Srđan and Crnomarković, Nenad Đ. and Stojanović, Andrijana D. and Tomanović, Ivan D. and Milićević, Aleksandar",
year = "2017",
abstract = "The essential ideas of investigations of turbulent flow in a straight rectangular duct are chronologically presented. Fundamentally significant experimental and theoretical studies for mathematical modeling and numerical computations of this flow configuration are analyzed. An important physical aspect of this type of flow is presence of secondary motion in the plane perpendicular to the streamwise direction, which is of interest from both the engineering and the scientific viewpoints. The key facts for a task of turbulence modeling and optimal choice of the turbulence model are obtained through careful examination of physical mechanisms that generate secondary flows.",
journal = "Thermal Science",
title = "Specific Aspects of Turbulent Flow in Rectangular Ducts",
volume = "21",
pages = "S663-S678",
doi = "10.2298/TSCI160201189S"
}

Stanković, B. D., Belošević, S., Crnomarković, N. Đ., Stojanović, A. D., Tomanović, I. D.,& Milićević, A.. (2017). Specific Aspects of Turbulent Flow in Rectangular Ducts. in Thermal Science, 21, S663-S678.
https://doi.org/10.2298/TSCI160201189S

Stanković BD, Belošević S, Crnomarković NĐ, Stojanović AD, Tomanović ID, Milićević A. Specific Aspects of Turbulent Flow in Rectangular Ducts. in Thermal Science. 2017;21:S663-S678.
doi:10.2298/TSCI160201189S .

Stanković, Branislav D., Belošević, Srđan, Crnomarković, Nenad Đ., Stojanović, Andrijana D., Tomanović, Ivan D., Milićević, Aleksandar, "Specific Aspects of Turbulent Flow in Rectangular Ducts" in Thermal Science, 21 (2017):S663-S678,
https://doi.org/10.2298/TSCI160201189S . .

TY  - THES
AU  - Stojanović, Andrijana D.
PY  - 2017
UR  - http://eteze.ni.ac.rs/application/showtheses?thesesId=5372
UR  - https://fedorani.ni.ac.rs/fedora/get/o:1415/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70052&RID=533920662
UR  - http://nardus.mpn.gov.rs/123456789/8919
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7328
AB  - Prediction of thermal-hydraulic conditions on a heated surface of heat exchangers during boiling and boiling crisis when the surface’s dry out can occur, because it is no more in contact with liquid phase, strongly depends on micro-conditions in nucleation site, liquid superheat, mass of evaporation per unit volume and time as well as void fraction and a two-phase mixture swell level. Due to inability of experimental research to include all of the above mentioned heat and mass transfer aspects on the interface and to realize the consequences of accidental conditions that can occur during heat exchanger's tube overheat, it is very important their numerical investigation.Prediction of two-phase thermal-hydraulic conditions on heat exchanger’s heated surface during boiling and boiling crisis is based on the two-fluid model and it consists of mass, momentum and energy fluid flow conservation equations for both liquid and vapor phase, while interface transfer processes are modeled by “closure laws”. Governing equations are solved by the “SIMPLE – Semi-Implicit-Method for Pressure-Linked Equations” type pressure-correction method that is derived for the multiphase flow conditions. Calculated are pressure field, velocities of both phases, enthalpy of liquid phase, void fraction as well as temperature field into and onto the heated wall. Developed numerical method represents significant contribution to the development of nucleate boiling researchviimethods, regarding previous investigation methods were largely experimental, while developed empirical methods could be reliably applied only within narrow range of flow and thermal parameters of importance for process. This model provides information on steam generation and enables direct numerical simulation of boiling process, as well as quantification of the impact of certain parameters of two-phase flow and heating wall conditions on the creation and running of nucleate boiling.
PB  - Универзитет у Нишу, Машински факултет
T2  - Универзитет у Нишу
T1  - Istraživanje termičkih i hidrauličkih uslova na grejnoj površini pri ključanju i krizi razmene toplote
UR  - https://hdl.handle.net/21.15107/rcub_nardus_8919
ER  - 

@phdthesis{
author = "Stojanović, Andrijana D.",
year = "2017",
abstract = "Prediction of thermal-hydraulic conditions on a heated surface of heat exchangers during boiling and boiling crisis when the surface’s dry out can occur, because it is no more in contact with liquid phase, strongly depends on micro-conditions in nucleation site, liquid superheat, mass of evaporation per unit volume and time as well as void fraction and a two-phase mixture swell level. Due to inability of experimental research to include all of the above mentioned heat and mass transfer aspects on the interface and to realize the consequences of accidental conditions that can occur during heat exchanger's tube overheat, it is very important their numerical investigation.Prediction of two-phase thermal-hydraulic conditions on heat exchanger’s heated surface during boiling and boiling crisis is based on the two-fluid model and it consists of mass, momentum and energy fluid flow conservation equations for both liquid and vapor phase, while interface transfer processes are modeled by “closure laws”. Governing equations are solved by the “SIMPLE – Semi-Implicit-Method for Pressure-Linked Equations” type pressure-correction method that is derived for the multiphase flow conditions. Calculated are pressure field, velocities of both phases, enthalpy of liquid phase, void fraction as well as temperature field into and onto the heated wall. Developed numerical method represents significant contribution to the development of nucleate boiling researchviimethods, regarding previous investigation methods were largely experimental, while developed empirical methods could be reliably applied only within narrow range of flow and thermal parameters of importance for process. This model provides information on steam generation and enables direct numerical simulation of boiling process, as well as quantification of the impact of certain parameters of two-phase flow and heating wall conditions on the creation and running of nucleate boiling.",
publisher = "Универзитет у Нишу, Машински факултет",
journal = "Универзитет у Нишу",
title = "Istraživanje termičkih i hidrauličkih uslova na grejnoj površini pri ključanju i krizi razmene toplote",
url = "https://hdl.handle.net/21.15107/rcub_nardus_8919"
}

Stojanović, A. D.. (2017). Istraživanje termičkih i hidrauličkih uslova na grejnoj površini pri ključanju i krizi razmene toplote. in Универзитет у Нишу
Универзитет у Нишу, Машински факултет..
https://hdl.handle.net/21.15107/rcub_nardus_8919

Stojanović AD. Istraživanje termičkih i hidrauličkih uslova na grejnoj površini pri ključanju i krizi razmene toplote. in Универзитет у Нишу. 2017;.
https://hdl.handle.net/21.15107/rcub_nardus_8919 .

Stojanović, Andrijana D., "Istraživanje termičkih i hidrauličkih uslova na grejnoj površini pri ključanju i krizi razmene toplote" in Универзитет у Нишу (2017),
https://hdl.handle.net/21.15107/rcub_nardus_8919 .

TY  - JOUR
AU  - Stojanović, Andrijana D.
AU  - Stevanović, Vladimir D.
AU  - Petrović, Milan M.
AU  - Zivkovic, Dragoljub S.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7136
AB  - Multi-dimensional numerical simulation of the atmospheric saturated pool boiling is performed. The applied modelling and numerical methods enable a full representation of the liquid and vapour two-phase mixture behaviour on the heated surface, with included prediction of the swell level and heated wall temperature field. In this way the integral behaviour of nucleate pool boiling is simulated. The micro conditions of bubble generation at the heated wall surface are modelled by the bubble nucleation site density, the liquid wetting contact angle and the bubble grow time. The bubble nucleation sites are randomly located within zones of equal size, where the number of zones equals the nucleation site density. The conjugate heat transfer from the heated wall to the liquid is taken into account in wetted heated wall areas around bubble nucleation sites. The boiling curve relation between the heat flux and the heated wall surface temperature in excess of the saturation temperature is predicted for the pool boiling conditions reported in the literature and a good agreement is achieved with experimentally measured data. The influence of the nucleation site density on the boiling curve characteristic is confirmed. In addition, the influence of the heat flux intensity on the spatial effects of vapour generation and two-phase flow are shown, such as the increase of the swell level position and the reduced wetting of the heated wall surface by the heat flux increase.
T2  - Thermal Science
T1  - Numerical Investigation of Nucleate Pool Boiling Heat Transfer
VL  - 20
SP  - S1301
EP  - S1312
DO  - 10.2298/TSCI160404276S
ER  - 

@article{
author = "Stojanović, Andrijana D. and Stevanović, Vladimir D. and Petrović, Milan M. and Zivkovic, Dragoljub S.",
year = "2016",
abstract = "Multi-dimensional numerical simulation of the atmospheric saturated pool boiling is performed. The applied modelling and numerical methods enable a full representation of the liquid and vapour two-phase mixture behaviour on the heated surface, with included prediction of the swell level and heated wall temperature field. In this way the integral behaviour of nucleate pool boiling is simulated. The micro conditions of bubble generation at the heated wall surface are modelled by the bubble nucleation site density, the liquid wetting contact angle and the bubble grow time. The bubble nucleation sites are randomly located within zones of equal size, where the number of zones equals the nucleation site density. The conjugate heat transfer from the heated wall to the liquid is taken into account in wetted heated wall areas around bubble nucleation sites. The boiling curve relation between the heat flux and the heated wall surface temperature in excess of the saturation temperature is predicted for the pool boiling conditions reported in the literature and a good agreement is achieved with experimentally measured data. The influence of the nucleation site density on the boiling curve characteristic is confirmed. In addition, the influence of the heat flux intensity on the spatial effects of vapour generation and two-phase flow are shown, such as the increase of the swell level position and the reduced wetting of the heated wall surface by the heat flux increase.",
journal = "Thermal Science",
title = "Numerical Investigation of Nucleate Pool Boiling Heat Transfer",
volume = "20",
pages = "S1301-S1312",
doi = "10.2298/TSCI160404276S"
}

Stojanović, A. D., Stevanović, V. D., Petrović, M. M.,& Zivkovic, D. S.. (2016). Numerical Investigation of Nucleate Pool Boiling Heat Transfer. in Thermal Science, 20, S1301-S1312.
https://doi.org/10.2298/TSCI160404276S

Stojanović AD, Stevanović VD, Petrović MM, Zivkovic DS. Numerical Investigation of Nucleate Pool Boiling Heat Transfer. in Thermal Science. 2016;20:S1301-S1312.
doi:10.2298/TSCI160404276S .

Stojanović, Andrijana D., Stevanović, Vladimir D., Petrović, Milan M., Zivkovic, Dragoljub S., "Numerical Investigation of Nucleate Pool Boiling Heat Transfer" in Thermal Science, 20 (2016):S1301-S1312,
https://doi.org/10.2298/TSCI160404276S . .

TY  - JOUR
AU  - Stevanović, Žarko M.
AU  - Mirkov, Nikola S.
AU  - Stevanović, Žana
AU  - Stojanović, Andrijana D.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3986
AB  - Modeling atmosperic boundary layer with standard linear models does not sufficiently reproduce wind conditions in complex terrain, especially on leeward sides of terrain slopes More complex models. based on Reynolds averaged Navier-Stokes equations and two-equation kappa-epsilon turbulence models for neutral conditions in atmospheric boundary written in general curvilinear non-orthogonal co-ordinate system, have been evaluated In order to quantify the differences and level of accuracy of different turbulence models, investigation has been performed using standard kappa-epsilon model without additional production terms and kappa-epsilon turbulence models with modified set of model coefficients The sets of full conservation equations are numerically solved by computational fluid dynamics technique. Numerical calculations of turbulence models are compared to the reference experimental data of Askervein hill measurements
T2  - Thermal Science
T1  - Validation of Atmospheric Boundary Layer Turbulence Model By On-Site Measurements
VL  - 14
IS  - 1
SP  - 199
EP  - 207
DO  - 10.2298/TSCI1001199S
ER  - 

@article{
author = "Stevanović, Žarko M. and Mirkov, Nikola S. and Stevanović, Žana and Stojanović, Andrijana D.",
year = "2010",
abstract = "Modeling atmosperic boundary layer with standard linear models does not sufficiently reproduce wind conditions in complex terrain, especially on leeward sides of terrain slopes More complex models. based on Reynolds averaged Navier-Stokes equations and two-equation kappa-epsilon turbulence models for neutral conditions in atmospheric boundary written in general curvilinear non-orthogonal co-ordinate system, have been evaluated In order to quantify the differences and level of accuracy of different turbulence models, investigation has been performed using standard kappa-epsilon model without additional production terms and kappa-epsilon turbulence models with modified set of model coefficients The sets of full conservation equations are numerically solved by computational fluid dynamics technique. Numerical calculations of turbulence models are compared to the reference experimental data of Askervein hill measurements",
journal = "Thermal Science",
title = "Validation of Atmospheric Boundary Layer Turbulence Model By On-Site Measurements",
volume = "14",
number = "1",
pages = "199-207",
doi = "10.2298/TSCI1001199S"
}

Stevanović, Ž. M., Mirkov, N. S., Stevanović, Ž.,& Stojanović, A. D.. (2010). Validation of Atmospheric Boundary Layer Turbulence Model By On-Site Measurements. in Thermal Science, 14(1), 199-207.
https://doi.org/10.2298/TSCI1001199S

Stevanović ŽM, Mirkov NS, Stevanović Ž, Stojanović AD. Validation of Atmospheric Boundary Layer Turbulence Model By On-Site Measurements. in Thermal Science. 2010;14(1):199-207.
doi:10.2298/TSCI1001199S .

Stevanović, Žarko M., Mirkov, Nikola S., Stevanović, Žana, Stojanović, Andrijana D., "Validation of Atmospheric Boundary Layer Turbulence Model By On-Site Measurements" in Thermal Science, 14, no. 1 (2010):199-207,
https://doi.org/10.2298/TSCI1001199S . .

TY  - CONF
AU  - Nemoda, Stevan
AU  - Radojević, Ana
AU  - Stojanović, Andrijana
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11618
AB  - Sagorevanje biomase kao i drugih goriva praćeno je emisijom štetnih produkata sagorevanja. Radi pronalaženja najpogodnijeg načina vođenja procesa sagorevanja neophodno je poznavati uticaj temperature na formiranje produkata sagorevanja. Analiza ovog uticaja može se ostvariti proračunom hemijsko--termodinamičke ravnoteže sistema koji se formira iz elemenata i jedinjenja sadržanih u gorivu i vazduhu za sagorevanje. Proračun daje ravnotežni sastav produkata sagorevanja u zavisnosti od temperature, na osnovu čega je moguće analizirati uticaj temperature na stvaranje brojnih štetnih gasova kao i mogućnost smanjenja nekih emisija odgovarajućim vođenjem procesa sagorevanja u ložištu. U radu je prikazan matematički model baziran na jednačinama formulisanim korišćenjem zakona dejstva masa, tzv. metod konstanti ravnoteže. Za rešavanje sistema jednačina korišćen je direktni iterativni metod. Rezultati proračuna dobijeni su za temperaturski interval od 800 K do 1700 K, pri pritisku od 1 bar, višku vazduha α = 1,0, 1,5, 2,0, 2,5 i 3,0, sadržaju vlage W = 10%, 20%, 30%, 40% i 50%, a za više vrsta biomasa
AB  - Biomass and other fuel combustion is associated with the emission of many harmful pollutants. In order to find a suitable method for organizing the combustion process, it is necessary to analyze the influence of temperature on combustion product emission. Such an analysis is being performed by computation of the chemical thermodynamic equilibrium composition of the system, which is formed from elements and components in fuel and in combusted air. The computation yields the equilibrium composition of the flue gases with respect to the combustion temperature and enables to reduce some products emission by adequate organization of combustion processes in furnaces. The developed mathematical model is presented in the paper, the model which is based on the equations formulated by using the mass action low i.e. equilibrium constant method. The results are obtained at temperatures from 800-1700K, pressure 1 bar, excess air α = 1.0, 1.5, 2.0, 2.5 and 3.0, moisture content W = 10, 20, 30, 40 and 50%, and for several different  types of biomass.
PB  - Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS) : Društvo za procesnu tehniku
C3  - 23. Međunarodni kongres o procesnoj industriji - PROCESING ′10 : zbornik radova
T1  - Modeliranje uticaja temperaturskih uslova sagorevanja na emisiju štetnih produkata sagorevanja biomase
T1  - Modelling of the combustion temperature condition influence on biomass combustion pollutant products emissions
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11618
ER  - 

@conference{
author = "Nemoda, Stevan and Radojević, Ana and Stojanović, Andrijana",
year = "2010",
abstract = "Sagorevanje biomase kao i drugih goriva praćeno je emisijom štetnih produkata sagorevanja. Radi pronalaženja najpogodnijeg načina vođenja procesa sagorevanja neophodno je poznavati uticaj temperature na formiranje produkata sagorevanja. Analiza ovog uticaja može se ostvariti proračunom hemijsko--termodinamičke ravnoteže sistema koji se formira iz elemenata i jedinjenja sadržanih u gorivu i vazduhu za sagorevanje. Proračun daje ravnotežni sastav produkata sagorevanja u zavisnosti od temperature, na osnovu čega je moguće analizirati uticaj temperature na stvaranje brojnih štetnih gasova kao i mogućnost smanjenja nekih emisija odgovarajućim vođenjem procesa sagorevanja u ložištu. U radu je prikazan matematički model baziran na jednačinama formulisanim korišćenjem zakona dejstva masa, tzv. metod konstanti ravnoteže. Za rešavanje sistema jednačina korišćen je direktni iterativni metod. Rezultati proračuna dobijeni su za temperaturski interval od 800 K do 1700 K, pri pritisku od 1 bar, višku vazduha α = 1,0, 1,5, 2,0, 2,5 i 3,0, sadržaju vlage W = 10%, 20%, 30%, 40% i 50%, a za više vrsta biomasa, Biomass and other fuel combustion is associated with the emission of many harmful pollutants. In order to find a suitable method for organizing the combustion process, it is necessary to analyze the influence of temperature on combustion product emission. Such an analysis is being performed by computation of the chemical thermodynamic equilibrium composition of the system, which is formed from elements and components in fuel and in combusted air. The computation yields the equilibrium composition of the flue gases with respect to the combustion temperature and enables to reduce some products emission by adequate organization of combustion processes in furnaces. The developed mathematical model is presented in the paper, the model which is based on the equations formulated by using the mass action low i.e. equilibrium constant method. The results are obtained at temperatures from 800-1700K, pressure 1 bar, excess air α = 1.0, 1.5, 2.0, 2.5 and 3.0, moisture content W = 10, 20, 30, 40 and 50%, and for several different  types of biomass.",
publisher = "Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS) : Društvo za procesnu tehniku",
journal = "23. Međunarodni kongres o procesnoj industriji - PROCESING ′10 : zbornik radova",
title = "Modeliranje uticaja temperaturskih uslova sagorevanja na emisiju štetnih produkata sagorevanja biomase, Modelling of the combustion temperature condition influence on biomass combustion pollutant products emissions",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11618"
}

Nemoda, S., Radojević, A.,& Stojanović, A.. (2010). Modeliranje uticaja temperaturskih uslova sagorevanja na emisiju štetnih produkata sagorevanja biomase. in 23. Međunarodni kongres o procesnoj industriji - PROCESING ′10 : zbornik radova
Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS) : Društvo za procesnu tehniku..
https://hdl.handle.net/21.15107/rcub_vinar_11618

Nemoda S, Radojević A, Stojanović A. Modeliranje uticaja temperaturskih uslova sagorevanja na emisiju štetnih produkata sagorevanja biomase. in 23. Međunarodni kongres o procesnoj industriji - PROCESING ′10 : zbornik radova. 2010;.
https://hdl.handle.net/21.15107/rcub_vinar_11618 .

Nemoda, Stevan, Radojević, Ana, Stojanović, Andrijana, "Modeliranje uticaja temperaturskih uslova sagorevanja na emisiju štetnih produkata sagorevanja biomase" in 23. Međunarodni kongres o procesnoj industriji - PROCESING ′10 : zbornik radova (2010),
https://hdl.handle.net/21.15107/rcub_vinar_11618 .