Kinetic simulation of two-dimensional spouted bed with draft plates by discrete element method

A discrete element method(DEM)-computational fluid dynamics(CFD) two-way coupling method was employed to simulate the hydrodynamic in two-dimensional spouted beds with draft plates.The motion of particles was modeled by DEM and the gas flow was modeled by Navier-Stokes equations.The interactions between gas and particles were considered by a two-way coupling method.The motion of particles in the spouted bed with complex geometry was solved by combining DEM and boundary element method(BEM).The minimal spouted velocity was obtained by the BEM+DEM-CFD simulation and the variation of the flow pattern of the bed with different superficial gas velocity was studied.The relationship between the pressure drop of the spouted bed and the superficial gas velocity was achieved from the simulations.The radial profile of averaged vertical velocities of particles and the profile of averaged void fraction in the spout and the annulus were statistically analyzed.The flow characteristics of the gas-solid system in the two-dimensional spouted bed were clearly described by the simulation results.