• Aleksandar Erić, Laboratory for Thermal Engineering and Energy, Vinča Institute of Nuclear Sciences, Serbia
  • Mirko Komatina, Faculty of Mechanical Engineering, University of Belgrade, Serbia
  • Stevan Đ Nemoda, Laboratory for Thermal Engineering and Energy, Vinča Institute of Nuclear Sciences, Serbia
  • Dragoljub Dakić, Laboratory for Thermal Engineering and Energy, Vinča Institute of Nuclear Sciences, Serbia
  • Branislav Repić, Laboratory for Thermal Engineering and Energy, Vinča Institute of Nuclear Sciences, Serbia

Determination of Stagnant Thermal Conductivity of Baled Agricultural Residue

  • This paper presents the results of experimental determination of the baled biomass stagnant thermal conductivity, which is an important thermophysical characteristic of the porous layer. The resulting dependence is important for the optimization of the combustion process, and the process modeling of transport phenomena in a porous layer of baled biomass. In order to determine the stagnant thermal conductivity baled agricultural biomass, the experimental method has been developed and made appropriate experimental installations. The influence of porosity layer on stagnant thermal conductivity has been experimentally investigated. Based on the performed measurements and analysis of experimental data, the functional dependence of stagnant thermal conductivity on porosity in the rangeof 0.50 to 0.85 was defined. The results show that the reduction of porosity layer to the value of 0.65 are reducing values of stagnant thermal conductivity, which can be explained by the pore size reducing,and decreasing volume of the air which actively participates in the process of heat transfer through the porous layer. By reducing the size of porosity below 0.65, thermal conductivity increase,which could be explained by the fact that the dominant mode of heat transfer becomes conduction through the solid phase. Stagnant thermal conductivity, as well as its dependence on porosity, are the starting point in the mathematical modelling of the so called cigarette combustion of the baled biomass, and may also be very important in the analysis of possible structural changes in the combustion chamber, which works on this principle.
  • Keywords
    stagnant thermal conductivity, baled agricultural biomass, cigarette combustion
  • Pages
    291 - 302
  • Submitted
  • Revised
  • Accepted
    0350-218X, 38 (2012), 3, 291-302
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