Inter-phase interaction in a turbulent, vertical channel flow laden with heavy particles. Part II: Two-phase velocity statistical properties

摘要

This paper was the second of a two-part study concerning inter-phase interaction in a turbulent vertical channel flow laden with heavy particle. The simulations considering two-way coupling model provided two phases' velocity statistics. Through the particle backward modulations, statistical fluctuations in the streamwise direction are transferred to the other two directions for both phases, which decrease the turbulence fluctuation anisotropy. The behavior of particle drift depends on the particle dispersion modes; consequently low-inertia particles travel toward the wall with negative velocities, even if they encounter fluid environments with adverse velocities directed toward the outer layer at the macroscopic statistical level. The particle drifts are altered by particle modulation of turbulence.