CFD-DEM Simulation of Fast Fluidization of Fine Particles in a Micro Riser

In recent years, the discrete element method (DEM) has gradually been applied to traditional fluidization simulation of fine particles in a micro fluidized bed (MFB). The application DEM simulating fast MFB not yet received attention. This article presents drag model that relies on surrounding environment particles, namely particle circumstance-dependent or PCDD model. Fast an is simulated using based Simulations indicate local structure exhibits aggregation, which natural property fluidization, forming where continuous dilute phase and dispersed concentrated coexist. There exists strong effect solid back-mixing MFB, leading relatively low outlet flux. gas is, however, so distinct. axial porosity shows monotonically increasing distribution with height but does strictly follow single exponential distribution. volume fraction at bottom significantly lower than correlated value CFB. heterogeneous cross-sectional average half also weakened. radial higher pattern central region one sidewall region.