Gas-solid flow simulations in spouted beds on body-fitted coordination

A gas-solid two-fluid model is presented in which the kinetic-frictional rheological model for dense assemblies of solids is incorporated in the simulation for spouted bed. This model treats the kinetic and frictional stresses of particles additively. The body fitted coordination is used to make the grids best fit the outline of a conical contour of the base in the spouted bed. The typical flow patterns in spouted beds were obtained, i.e., the spout, the fountain and the annular zones, and clearly indicated. Effects of operating conditions and geometrical dimensions of conical contour on partial velocity and concentration in the spout, annulus and fountain are determined. Our simulations showed that as the inclined angle decreases, the diameter of the spout increases. For an inclined angle of 60° and greater, there is a neck near the inlet of spouted beds. Simulations of particle concentration and velocity distributions in a spouted bed revealed that the frictional stresses were significant effect on the flow of particles in the annulus.