Effects of thermal radiation on the sound wave propagation in a gas-particle two-phase medium

A study is made of the sound wave propagation through a radiating gas mediu m that contains solid particles in suspension. The relaxation models are in troduced to describe the temporal momentum and thermal nonequilibrium inter actions between gas and particles. The gray gas differential approximation is used for radiation. It is found that the radiation induces the attenuati on mode, the position of which is varied with the absorption coefficient in addition to the immovable mot by suspended particles. Tbe attenuation beca use of radiation is greatly influenced by the absorption coefficient of the radiative medium while the dispersion remains almost unchanged. As the abs orption coefficient increases, the attenuation mode because of radiation sh ifts to the higher frequency zone. This radiation effect is significantly r educed as the particle mass loading increases, since the convection becomes much more dominant.