Thermophoresis of particles in gas-particle two-phase flow with radiation effect, Numerical Heat Tr

The radiation effect on the thermophoresis of particles is analyzed for a gas-particle two-phase laminar ow. Two-phase radiation by both gas and particles is considered; in ad-dition, the thermal nonequilibrium between gas and particle is taken into account. It is concluded that the particle diffusion velocity as well as particle concentration depends strongly on the optical radius of gas or particle. In general, the radiation was found to decrease the particle diffusion. In case that gas as well as particle radiation exists, the deposition of particle is mainly in uenced by the gas. The effects of parameters such as the optical radius, conduction to radiation parameter, thermal loading ratio, and wall emissivity on the cumulative collection ef ciency E(x) are also considered. As the optical radius and tube wall emissivity increase, E(x) decreases. The increase in conduction to radiation parameter N and thermal loading ratio CL leads to an increase in E(x)