Investigation on the effect of fractal soot aggregation on radiative transfer in homogeneous gas-soot mixture using full-spectrum k-distribution method

Abstract

The full-spectrum k-distribution (FSK) method and Generalized Multiparticle Mie-solution (GMM) method are applied to study the influences of soot aggregation on the radiative heat transfer in homogeneous gas-soot mixtures. The radiative transfer equation is solved by the finite volume method. The effect of soot aggregates with different fractal dimensions, monomer radiuses and the number of monomers on distributions of radiative heat flux and radiative heat source in the gas-soot mixture are studied, and the results show that increasing the fractal dimension, monomer radiuses, or decreasing the number of monomers will result in larger deviation between local radiative heat flux and radiative heat source of gas-soot mixture with soot aggregates and those with single soot particles. As a whole, the soot aggregation has a significant impact on the radiative heat transfer in the homogeneous gas-soot mixtures, and the effect of soot aggregation should better be considered as much as possible to obtain more accurate calculated results.

Keywords

• gas-soot mixture
• fractal aggregate
• full-spectrum k-distribution
• radiative heat transfer
• generalized multiparticle mie-solution method