Abstract:

The direct simulation Monte Carlo（DSMC）method based on Lagrangian approach was applied to large-scale gas-solid two-phase impinging streams with a large number of particles to solve the problem of calculating too many particle collisions with the particle trajectory model.A mathematical model for the gas-solid two-phase impinging streams was proposed.The gas flow field，particle distributions and collision positions were analyzed based on the calculation results.The particle motion behavior，particle residence time and the particle effect on gas flow by considering the particle collision were compared with those without considering the particle collision.The results indicated that the DSMC method can be effectively applied to the numerical study of large-scale gas-solid two-phase impinging streams.The particle distribution can be divided into three zones：particle-collision zone，particle-jetting zone and particle-scattering zone.Particle collisions occurred mainly in the particle-collision zone causing enrichment of particles and decreased residence time of particles in the area.The particle effect on gas flow was not significant at a small particle to gas ratio of the present study.