Indoor Numerical Study Of Suspended Particles And Radiation Calculations

This paper first overviews now many multiphase (primarily about gas-particle two phases flow) research methods together with the development of multiphase model. After the analysis of the forces acted on the single particle posed by the gas flow, and the order comparison between those forces, combining the newly research results, some forces such as Magnuss force are neglected. The single particle motion equation is established. According the state of gas-particle motion, the particles motion in the clean room is located at the regime of slip. The multifluids model and no-slip model are selected to study the motions of particles and gas on the basis of the comparison among the various multi phase models. In the discrete process the mostly used method, the control volume method, is used. In the study of gas-particle flows numerical simulation, the GEMCHIP arithmetic is often adopted. But it cannot be used directly in the investigation of clean room because of the low volume occupancy (its volume fraction order is 10-10 below). In the study the particle number density is directly solved instead of the volume fraction of particles. The numerical simulations are performed in two actual targets. It is concluded that the simulations are successful by the comparison results between the experimental results and the other scholar' s results. The relationship between the gas and particles is obtained as well as the distributions of velocities both of gas and particle, temperature, particle number density, and other turbulent qualities such as turbulent kinetic energy and its dissipation rate. It finds that micro zone clean control through the well-designed flow pattern is possible. On the basis of the results, the turbulent Prantl constant using in the small-slip model is also obtained. Its value is about 1. 345. In the end the core arithmetic of particle orbit model (Monte Carlo method) is investigated too. In the research, it is used to calculate a room heating by a radiator. The net radiation heat gain or loss of each wall or closure is presented. Meanwhilethe net heat gain or loss of human being is got under different radiator temperature. The results are validated by the results calculated by other method such as discrete transfer method.