NUMERICAL-SIMULATION AND EXPERIMENTAL INVESTIGATION OF A GAS SOLID 2-PHASE FLOW IN A HORIZONTAL CHANNEL

The present paper deals with the numerical simulation of the motion of solid particles in a horizontal, two-dimensional, turbulent channel flow. The simulation is based on the Lagrangian approach, which treats the disperse phase as a number of single particles. Their trajectories are calculated by integration of the equation of motion. For the treatment of the particle-wall collision process a new approach is used, taking into consideration the influence of the wall surface roughness on the motion of the solid particles. The coefficients of dynamic friction and restitution are determined from particle-wall collision experiments. The collision of spherical particles with smooth and rough steel plates is investigated. It was found that even a very low degree of wall surface roughness has a qualitative influence on the behaviour of solid particles. Velocity and concentration profiles of the solid phase can be determined as a result of numerical simulation. The results of the numerical calculation are compared with measured particle velocity profiles and good agreement was obtained.