| With the development of economy, the energy demand increases ceaselessly. At the same time, the pollution by the energy is getting worse. The research on the fine particle is very important which is in flue gas of the fossil-fueled power plant, the severe accident of nuclear power and Electronic product manufacturing. The study found the fine particles concentration and velocity distribution are associated with the temperature field, channel, geometry, partials size and Re. The particles in temperature field are mainly affected by thermophoretic force. It showed the thermophoresis deposition transformation was in accordance with the factors and the computational formula of the particle thermophoresis deposition in narrow rectangular channel under Temperature Fields. The computational formula had a good agreement with the Classic formulas. The experimental section is lm long and the cross section is 20mm long and 20mm wide. One wall of the experimental section is visible glass, so that it is very easy to measure the temperature and discover the rules of the kinetic characteristic of the fine particles in narrow rectangular channel under Temperature Fields. Under the conditions of the different flow, the different temperature difference, the different size particles of the gas-solid two-phase flow, particle concentration distribution, particle size changes, and particle velocity distribution was analyzed. Using the computational formula, the influence of the radioactive particles deposition on the steel containment vessel on the security function of the steel containment vessel is analyzed in the presumptive severe accident of AP1000. The analyses found that the particle deposition on the steel containment vessel seriously affect the security function of the steel containment vessel. This study can provide a base for the development of the technology of removing fine particles by using the kinetic characteristic of the fine particles in narrow rectangular.
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