Ckk. Lun et Hs. Liu, NUMERICAL-SIMULATION OF DILUTE TURBULENT GAS-SOLID FLOWS IN HORIZONTAL CHANNELS, International journal of multiphase flow, 23(3), 1997, pp. 575-605
A dilute turbulent gas-solid two-phase flow model is developed in the
present study. Time-averaged conservation equations for mass and momen
tum, and a two-equation k-e closure are used to model the quid phase.
The solid phase consisting of inelastic, frictional, uniform spheres i
s simulated by using a Lagrangian approach in which the particle traje
ctories and velocities are determined by integrating the particle equa
tions of motion. The fluid-solid coupling effects due to solid volume
fraction and interfacial momentum interaction are incorporated in the
simulation. A sticking-sliding collision model is employed for the par
ticle-particle collisions and the particle-wall collisions. The two-ph
ase model is implemented to simulate gas-solid suspensions in a horizo
ntal channel. Substantial agreement is found between the simulation re
sult and the experimental data for the fluid pressure gradient, the di
stributions of mean gas velocity, mean particle velocity and concentra
tion. For dilute systems with solids volume fraction of the order 10(-
3), interparticle collisions are found to be crucial in sustaining a s
teady and fully developed suspension in the horizontal channel, while
the Magnus lift due to particle rotation is found to play a significan
t role as well. Detailed new numerical results for macroscopic propert
ies such as Reynolds stresses, air turbulence intensities. particle fl
uctuation kinetic energy, mean particle angular velocity, particle str
esses and angular momentum fluxes are presented in the paper. (C) 1997
Elsevier Science Ltd.