Radiative Characteristics of Nongray Gas Containing Anisotropic Scattering Particles.

Abstract

The Monte Carlo method is applied to study the effects of nongray gas and anisotropic scattering on the temperature profiles of particle-gas mixture between parallel black cold walls. The gas is nongray combustion gas and the particle is assumed to have gray surface and behaves as an absorber, emitter and anisotropic scatterer of radiative energy. The analysis is based on radiative transfer in a medium which is internally heated uniformly. For comparison, analyses with gray gas and with isotropic scattering particles are also carried out. The results obtained show that within the particle number density region where radiation-heat-transfer enhancement is expected, the gray gas assumption presents a flatter temperature profi1e than that of the nongray gas. When the particle density is increased, the layer temperature at the center first decreases and then, for greater particle density, it increases. But the temperature of the mixture adjacent to the wall, after being decreased, approaches a certain value when the particle density is increased. In the higher particle density region, the anisotropic scattering effect causes layer temperature higher than that of isotropic scattering.