Abstract
Numerical simulations with two way coupling were performed for downward particle-laden turbulent flows in a vertical channel. The effect of inter particle collision on the motion of particles and the turbulence modification was studied. Fluid motion was calculated by using LES with the same models as in single phase flows and the motion of individual particles by the Lagrangian method. Some results were compared with measurements by Kulick et al. (1994). It was found that the effect of inter-particle collision on particle diffusion manifests itself even at low particle volume fraction of the order O(10<-4), and that the inter particle collision makes the particle fluctuation intensity and the profile of mean particle velocity aproach to experimental measurements.
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