APPLYING THEORY OF DENSE GAS TO MODEL GAS PARTICLE FLOW

Complex hydrodynamic behavior of circulating fluidized beds makes difficulties with the scale up. It is well know that the large scale lateral solids segregation causes a complex two phase flow pattern which significantly influences their performance. Though some work has been done, many flow characteristics have no be well exptained therorically. The kinetic theory for granular flow based on the Chapamn Enskoy theory of dense gases and the relvant hydrodynamic theory were used to model the influences of direct particle particle collisions in the paper. Associated with the random motion of particles, a pseudo temperature was defined. Using a method of modeling transport mechanisms resulted in the well known Boltzman Integral differential Equation on a pair velocity distribution function. By solving the equation, we not only acquired the continuity equation, momentum equation and pseudo temperature equation, but also produced the formulations of particle pressure, viscosity and transport coefficient of particle temperature et al. Gas particle two phase kinetic model was also advanced completely. At the end, radial distribution of particles velocities and volume fractions cuas also afforded, which is used in the comparison between simulation and experimental results. By the comparison, it was clearly that the proposed model is successful in use.