The Model And Simulation Of Turbulent Gas-Particle Flow In A Vertical Channel

The interaction between coherent fluid structure and particle near the wall is one of most important topic in wall-bounded gas-particle turbulence, which would have significant impact on particle wall boundary condition development and understanding of turbulence modulation mechanism.This thesis provides a primary investigation on gaseous turbulence and gas-particle turbulent flow in a vertical channel using the Reynolds-Stress-PDF model, during which the gaseous governing equations were solved by finite difference scheme, the particle Lagrangian equations were solved by Monte Carlo method, and the Reynods-Stress-PDF model was solved by a mixed method of finite difference scheme with Monte Carlo method. The statistical properties of fluid obtained by current study, including average velocity, fluctuated velocity et al without particles, agree well with previous PIV results. Subsequently, the turbulent diffusion behaviors of glass particles (with mean diameter 150um and mass loading 0.20) in a vertical channel were investigated. It showed that particles attenuated the fluid's turbulence intensity in the center of channel, but near the wall they augmented turbulence sometimes. That mostly was produced by the complex behaviors of particle-particle collision, particle-wall collision, and the interaction between phases. To sum up, the turbulence was mostly attenuated by glass particles in our study.