Modified MFIX code to simulate hydrodynamics of gas-solids bubbling fluidized beds: A model of coupled kinetic theory of granular flow and discrete element method

Abstract

The coefficient of restitution (CoR) of monodisperse particles used in the kinetic theory of granular flow (KTGF) is predicted using a coupled Euler solid phase-Euler gas phase-Lagrangian discrete particles (CEEL) approach in a bubbling fluidized bed (BFB). In the CEEL model, the CoR is obtained from dynamic information of Lagrangian discrete particles by means of discrete element method (DEM), and used to predict Euler solid phase properties in KTGF. The flow behavior of Euler solid phase, Euler gas phase and Lagrangian discrete particles is predicted in a gas and monodisperse particles BFB. The distributions of velocities and volume fractions using CEEL model are compared to numerical simulations using Euler-Euler two-fluid model (TFM) and Euler gas phase-Lagrangian discrete element method (CFD-DEM) in a BFB. The predicted distributions of granular temperature of Euler solid phase using KTGF are compared to Lagrangian discrete particles granular temperatures by means of DEM. The predicted distributions of velocities of Euler solid phase and volume fractions of Euler gas phase using CEEL model agree with experimental results.