Computational fluid dynamics of riser using kinetic theory of rough spheres

Flow behavior of particles in the riser was simulated using a computational fluid dynamics (CFD). Conservation equations of mass and momentum for solid phase were solved on the basis of kinetic theory of rough spheres (KTRS). The fluctuation kinetic energy of particles is introduced to characterize the random motion of particles as a measure of the translational and rotational velocity fluctuations. The distribution of concentration and velocity of particles are obtained in a riser. The simulated concentration of particles agreed reasonably with the available experimental results. The random-motion kinetic energy of inelastic rough particles is shown to be affected by the particle restitution coefficient and roughness. The effects of the coefficient of normal restitution and roughness on the distribution of solid phase in the riser are studied. In this case, the influence of the coefficient of normal restitution is weak in the riser using KTRS model.