TY  - JOUR
AU  - Erić, Aleksandar
AU  - Komatina, M.
AU  - Nemoda, Stevan
AU  - Dakić, Dragoljub V.
AU  - Repić, Branislav
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/966
AB  - Modeling of transport phenomena in materials with porous bed features requires thermophysical properties, such as porosity, permeability and thermal conductivity be known. The paper presents experimental data obtained in the course of investigation focused on analysis of stagnant thermal conductivity of biomass. Experiments were conducted using a custom designed and constructed experimental setup and implementing original experimental procedure. Results obtained enabled stagnant thermal conductivity of biomass to be determined for different biomass porosity values. Analysis of the experimental data enabled functional dependence of stagnant thermal conductivity on porosity to be determined, with porosity varied in a range 0.50-0.85. Results obtained indicate that reduced bed porosity, down to the value of 0.65, causes stagnant thermal conductivity of the bed to be reduced. Further porosity reduction, below the value of 0.65, results in increased stagnant thermal conductivity of the bed. Experimental procedure developed shall be useful for gathering experimental data on different materials planned to be analyzed when examining transport phenomena occurring during combustion of biomass bales. In addition, data to be acquired shall be helpful in modeling the transport phenomena associated with combustion in porous beds. (C) 2015 Elsevier Ltd. All rights reserved.
PB  - Elsevier
T2  - Renewable and Sustainable Energy Reviews
T1  - Determination of thermal conductivity of baled agricultural biomass
VL  - 58
SP  - 876
EP  - 884
DO  - 10.1016/j.rser.2015.12.066
ER  - 

@article{
author = "Erić, Aleksandar and Komatina, M. and Nemoda, Stevan and Dakić, Dragoljub V. and Repić, Branislav",
year = "2016",
abstract = "Modeling of transport phenomena in materials with porous bed features requires thermophysical properties, such as porosity, permeability and thermal conductivity be known. The paper presents experimental data obtained in the course of investigation focused on analysis of stagnant thermal conductivity of biomass. Experiments were conducted using a custom designed and constructed experimental setup and implementing original experimental procedure. Results obtained enabled stagnant thermal conductivity of biomass to be determined for different biomass porosity values. Analysis of the experimental data enabled functional dependence of stagnant thermal conductivity on porosity to be determined, with porosity varied in a range 0.50-0.85. Results obtained indicate that reduced bed porosity, down to the value of 0.65, causes stagnant thermal conductivity of the bed to be reduced. Further porosity reduction, below the value of 0.65, results in increased stagnant thermal conductivity of the bed. Experimental procedure developed shall be useful for gathering experimental data on different materials planned to be analyzed when examining transport phenomena occurring during combustion of biomass bales. In addition, data to be acquired shall be helpful in modeling the transport phenomena associated with combustion in porous beds. (C) 2015 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier",
journal = "Renewable and Sustainable Energy Reviews",
title = "Determination of thermal conductivity of baled agricultural biomass",
volume = "58",
pages = "876-884",
doi = "10.1016/j.rser.2015.12.066"
}

Erić, A., Komatina, M., Nemoda, S., Dakić, D. V.,& Repić, B.. (2016). Determination of thermal conductivity of baled agricultural biomass. in Renewable and Sustainable Energy Reviews
Elsevier., 58, 876-884.
https://doi.org/10.1016/j.rser.2015.12.066

Erić A, Komatina M, Nemoda S, Dakić DV, Repić B. Determination of thermal conductivity of baled agricultural biomass. in Renewable and Sustainable Energy Reviews. 2016;58:876-884.
doi:10.1016/j.rser.2015.12.066 .

Erić, Aleksandar, Komatina, M., Nemoda, Stevan, Dakić, Dragoljub V., Repić, Branislav, "Determination of thermal conductivity of baled agricultural biomass" in Renewable and Sustainable Energy Reviews, 58 (2016):876-884,
https://doi.org/10.1016/j.rser.2015.12.066 . .

TY  - JOUR
AU  - Žunić, Zora S.
AU  - Ujić, Predrag
AU  - Nađđerđ, Laslo
AU  - Yarmoshenko, Ilia V.
AU  - Radanovic, S. B.
AU  - Petrović, S. Komatina
AU  - Čeliković, Igor T.
AU  - Komatina, M.
AU  - Bossew, Peter
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/231
AB  - In this work the strong influence of geological factors on the variability of indoor radon is found in two of three geologically very different regions of South-Eastern Europe. A method to estimate the annual mean concentration when one seasonal measurement is missing is proposed. Large differences of radon concentrations in different rooms of the same house and significant difference in radon concentrations in one season comparing it to the others are noted in certain cases. Geological factors that can lead to such behavior are discussed. (C) 2014 Elsevier Ltd. All rights reserved.
T2  - Applied Radiation and Isotopes
T1  - High variability of indoor radon concentrations in uraniferous bedrock areas in the Balkan region
VL  - 94
SP  - 328
EP  - 337
DO  - 10.1016/j.apradiso.2014.08.018
ER  - 

@article{
author = "Žunić, Zora S. and Ujić, Predrag and Nađđerđ, Laslo and Yarmoshenko, Ilia V. and Radanovic, S. B. and Petrović, S. Komatina and Čeliković, Igor T. and Komatina, M. and Bossew, Peter",
year = "2014",
abstract = "In this work the strong influence of geological factors on the variability of indoor radon is found in two of three geologically very different regions of South-Eastern Europe. A method to estimate the annual mean concentration when one seasonal measurement is missing is proposed. Large differences of radon concentrations in different rooms of the same house and significant difference in radon concentrations in one season comparing it to the others are noted in certain cases. Geological factors that can lead to such behavior are discussed. (C) 2014 Elsevier Ltd. All rights reserved.",
journal = "Applied Radiation and Isotopes",
title = "High variability of indoor radon concentrations in uraniferous bedrock areas in the Balkan region",
volume = "94",
pages = "328-337",
doi = "10.1016/j.apradiso.2014.08.018"
}

Žunić, Z. S., Ujić, P., Nađđerđ, L., Yarmoshenko, I. V., Radanovic, S. B., Petrović, S. K., Čeliković, I. T., Komatina, M.,& Bossew, P.. (2014). High variability of indoor radon concentrations in uraniferous bedrock areas in the Balkan region. in Applied Radiation and Isotopes, 94, 328-337.
https://doi.org/10.1016/j.apradiso.2014.08.018

Žunić ZS, Ujić P, Nađđerđ L, Yarmoshenko IV, Radanovic SB, Petrović SK, Čeliković IT, Komatina M, Bossew P. High variability of indoor radon concentrations in uraniferous bedrock areas in the Balkan region. in Applied Radiation and Isotopes. 2014;94:328-337.
doi:10.1016/j.apradiso.2014.08.018 .

Žunić, Zora S., Ujić, Predrag, Nađđerđ, Laslo, Yarmoshenko, Ilia V., Radanovic, S. B., Petrović, S. Komatina, Čeliković, Igor T., Komatina, M., Bossew, Peter, "High variability of indoor radon concentrations in uraniferous bedrock areas in the Balkan region" in Applied Radiation and Isotopes, 94 (2014):328-337,
https://doi.org/10.1016/j.apradiso.2014.08.018 . .

TY  - JOUR
AU  - Erić, Aleksandar
AU  - Dakić, Dragoljub V.
AU  - Nemoda, Stevan
AU  - Komatina, M.
AU  - Repić, Branislav
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4430
AB  - The paper presents results of experimental investigation conducted to determine permeability coefficient of a porous bed formed by biomass bales, whereby the said coefficient represents one of the most important parameters of the bed material specified when considering its combustion in the pusher-type furnaces (i.e. combustion of biomass bales in cigar burners). Correlations obtained are deemed very important for optimization of biomass bale combustion, as well as for modeling transport phenomena occurring in the porous bed formed by biomass bales during their combustion in cigar burners. In order to determine permeability coefficient of air flow through soy straw bales, appropriate experimental method was developed and suitable experimental apparatus designed and constructed. The relevant coefficients were determined in such manner as to be representative of the viscous and inertial terms of the Forchheimer equation. Experimental investigation conducted examined the effects of relevant biomass bale parameters i.e. porosity and the moisture content on the abovementioned Forchheimer coefficients. Measurements conducted, as well as analysis of the results obtained, defined functional dependencies of the permeability coefficients on the porosity (which was varied in the range 0.62-0.78, for moisture content of 0.0948) and the samples moisture content (which was varied in the range 0.0948-0.6394, for the selected value of porosity of 0.68) to be established. The correlations obtained are deemed suitable to be used in a broad spectrum of operating conditions that usually occur during real operation. Results obtained indicate that reduction in biomass bed porosity results in reduced permeability, with Forchheimer coefficients exhibiting a hyperbolic dependence on the bed porosity. Since it has been observed that increased moisture content of the sample (porosity value of 0.68) caused a decrease in permeability, a functional dependence of the sample moisture content on the porosity has been established. The dependence established is valid for the range of the sample moisture content between 0.0948 and 0.6394. Permeability coefficients, as well as their dependencies on the relevant factors (porosity and moisture content), represent basic data used in mathematical modeling of biomass bale combustion in cigar burners. In addition, the ones may also be very important when considering modifications of furnaces utilizing the combustion principle mentioned. (C) 2011 Elsevier Ltd. All rights reserved.
T2  - International Journal of Heat and Mass Transfer
T1  - Experimental method for determining Forchheimer equation coefficients related to flow of air through the bales of soy straw
VL  - 54
IS  - 19-20
SP  - 4300
EP  - 4306
DO  - 10.1016/j.ijheatmasstransfer.2011.05.015
ER  - 

@article{
author = "Erić, Aleksandar and Dakić, Dragoljub V. and Nemoda, Stevan and Komatina, M. and Repić, Branislav",
year = "2011",
abstract = "The paper presents results of experimental investigation conducted to determine permeability coefficient of a porous bed formed by biomass bales, whereby the said coefficient represents one of the most important parameters of the bed material specified when considering its combustion in the pusher-type furnaces (i.e. combustion of biomass bales in cigar burners). Correlations obtained are deemed very important for optimization of biomass bale combustion, as well as for modeling transport phenomena occurring in the porous bed formed by biomass bales during their combustion in cigar burners. In order to determine permeability coefficient of air flow through soy straw bales, appropriate experimental method was developed and suitable experimental apparatus designed and constructed. The relevant coefficients were determined in such manner as to be representative of the viscous and inertial terms of the Forchheimer equation. Experimental investigation conducted examined the effects of relevant biomass bale parameters i.e. porosity and the moisture content on the abovementioned Forchheimer coefficients. Measurements conducted, as well as analysis of the results obtained, defined functional dependencies of the permeability coefficients on the porosity (which was varied in the range 0.62-0.78, for moisture content of 0.0948) and the samples moisture content (which was varied in the range 0.0948-0.6394, for the selected value of porosity of 0.68) to be established. The correlations obtained are deemed suitable to be used in a broad spectrum of operating conditions that usually occur during real operation. Results obtained indicate that reduction in biomass bed porosity results in reduced permeability, with Forchheimer coefficients exhibiting a hyperbolic dependence on the bed porosity. Since it has been observed that increased moisture content of the sample (porosity value of 0.68) caused a decrease in permeability, a functional dependence of the sample moisture content on the porosity has been established. The dependence established is valid for the range of the sample moisture content between 0.0948 and 0.6394. Permeability coefficients, as well as their dependencies on the relevant factors (porosity and moisture content), represent basic data used in mathematical modeling of biomass bale combustion in cigar burners. In addition, the ones may also be very important when considering modifications of furnaces utilizing the combustion principle mentioned. (C) 2011 Elsevier Ltd. All rights reserved.",
journal = "International Journal of Heat and Mass Transfer",
title = "Experimental method for determining Forchheimer equation coefficients related to flow of air through the bales of soy straw",
volume = "54",
number = "19-20",
pages = "4300-4306",
doi = "10.1016/j.ijheatmasstransfer.2011.05.015"
}

Erić, A., Dakić, D. V., Nemoda, S., Komatina, M.,& Repić, B.. (2011). Experimental method for determining Forchheimer equation coefficients related to flow of air through the bales of soy straw. in International Journal of Heat and Mass Transfer, 54(19-20), 4300-4306.
https://doi.org/10.1016/j.ijheatmasstransfer.2011.05.015

Erić A, Dakić DV, Nemoda S, Komatina M, Repić B. Experimental method for determining Forchheimer equation coefficients related to flow of air through the bales of soy straw. in International Journal of Heat and Mass Transfer. 2011;54(19-20):4300-4306.
doi:10.1016/j.ijheatmasstransfer.2011.05.015 .

Erić, Aleksandar, Dakić, Dragoljub V., Nemoda, Stevan, Komatina, M., Repić, Branislav, "Experimental method for determining Forchheimer equation coefficients related to flow of air through the bales of soy straw" in International Journal of Heat and Mass Transfer, 54, no. 19-20 (2011):4300-4306,
https://doi.org/10.1016/j.ijheatmasstransfer.2011.05.015 . .