Simulation of Circulating Fluidized Bed using Lattice-Boltzmann Drag Model

This paper presents a computational study of the flow behavior in a cold-flow scale circulating fluidized bed. A multi-fluid Computational Fluid Dynamics (CFD) model has been developed and verified against experimental data reported in the literature. The flow model is based on an Eulerian description of the phase where the kinetic theory of granular flow forms the basis for the turbulence modeling in the solid phase. The model is generalized for one gas phase and mean particle size of solids phase to enable a realistic description of the particle size distribution in gas - solids flow systems. In this paper used new Lattice-Boltzmann model for drag coefficient between solid-gas phases. The results of this new drag model compared with Wen & YU drag model and Experimental data. The simulation results with this new drag model are in better agreement with experimental data.