B109 THERMOPHORESIS OF PARTICLES IN GAS-PARTICLE TWO PHASE FLOW WITH RADIATION EFFECT(Droplet/particle combustion-2)

概要

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The radiation effect on the thermophoresis of particles is analyzed for a gas-particle two phase laminar flow. Two phase radiation by both gas and particle is considered, while scattering is neglected; in addition, the thermal non-equilibrium 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 g eneral, 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 influenced 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 efficiency 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 C_L leads to an increase in E(x). The E(x) is more dependent on gas optical radius for the conditions given here.
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2000-10-01