Numerical study on flow behavior of multi-component particles in a fluidized bed using a TFM-DEM hybrid model

Flow behaviors of multi-type particles are investigated by TFM-DEM hybrid model coupled with kinetic theory of granular flow in a gas-solids bubbling fluidized bed. The flow behaviors of different discrete particles and continuum solids phase are analyzed. The effects of drag models, coefficient of restitution and friction coefficient on the flow behavior are predicted. Simulated results reveal that the higher restitution coefficient and friction coefficient give rise to higher velocities and lower solids volume fractions. The Huilin-Gidaspow drag model provides a better correspondence with the experiments. The influence of Coulomb friction coefficient on hydrodynamics is considered to simulate the flow of discrete particles, and the simulated results with Coulomb friction coefficient are in better agreement with experiments, comparing to results without Coulomb friction coefficient. (C) 2018 Elsevier B.V. All rights reserved.