Effects of Restitution and Specularity Coefficients on Solid-Liquid Fluidized BedHydrodynamics

An Eulerian-Eulerian two-fluid model in combination with the kinetic theory of granular flow was applied to simulate a solid-liquid fluidized bed filled with stainless-steel particles. The drag model of Gidaspow used in computational fluid dynamics simulations proved to be the appropriate model for predicting the bed hydrodynamics. The effect of the restitution coefficient of the particles on the bed hydrodynamics was investigated numerically. For the solid phase wall boundary condition according to Johnson and Jackson a specularity coefficient was introduced and evaluated. The change in specularity coefficient did not affect considerably the bed behavior at the middle part, but at the walls it significantly influenced the granular temperature. For specularity coefficients more than 0.5 the results do not change noticeably.