Numerical simulations of the effects of conical dimension on the hydrodynamic behaviour in spouted beds
Résumé
The flow behaviours of gas-solids were predicted by means of a hydrodynamic model of dense gas-solid flow in spouted beds. Constitutive equations describing the particulate solids pressure and viscosity were implemented into a hydrodynamic simulation computer program. The effect of operating conditions (inclined angle and gas spouting velocity) on particle velocity and concentration in the spout, annulus and fountain regions were numerical studied. Both vertical and horizontal particle velocities increased with increasing spouting gas velocity. The diameter of the spout increases with decreasing the inclination angle. As the inclination angle is set greater than 60degrees, the spout cross-section starts becoming bottlenecked, limiting the upwards flow of solids.