The general purpose of this paper is the modeling of particle-turbulence interaction and particle-particle collisions taking place in dilute gas-solid flows. Direct numerical simulation of a homogeneous isotropic turbulence coupled with discrete particle simulation have been carried out with a model taking into account the effect of the film drainage between colliding particles. The results show that, depending on the particle Stokes number, the particle kinetic energy is strongly modified by the fluid drainage effect. In the frame of the joint fluid-particle approach, taking into account the correlations induced by the turbulence on the colliding velocities, a model has been derived and compared with the DNS results.

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