A coupled computational fluid dynamics (CFD)discrete element method (DEM) technique has been adopted to examine the dynamic behavior of particles in a rectangular spouted bed. Eulerian method has been used to solve the Navier−Stokes equation for the gas phase (for the CFD) and Lagrangian method (for the DEM) for the particle phase, where the k−ϵ two-equation turbulence model has been used to capture the effect of gas-phase turbulence. In the present work, we sought to predict the minimum spouting velocity (U ms ) numerically for a fixed bed height and particular particle properties. The effects of the inelastic collision and the friction on translational and rotational dynamics of the particles in spout, annulus, and fountain zones have been brought out with the intensive parametric study. The results reported here would be a way forward for a better understanding of the spouted bed processing where translational and rotational dynamics of particles play a key role.
The computational fluid dynamics−discrete element method (CFD−DEM) technique has been used to investigate the translational and rotational dynamics of polydispersed particles in a pseudo-two-dimensional spouted bed. Minimum spouting velocity is predicted numerically and compared with the experimental measurements. The mean particle-phase translational and angular velocities have been computed and compared for finer and coarser particles. The dynamics of the polydispersed particles have been compared with monosize particles having an equivalent Sauter mean diameter. In the polydispersed bed, particles with lower diameters spread up to the wall of the spout setup, leading to a reduction in a particle-free zone away from the core. Segregation of the finer and the coarser particles has been assessed for different superficial gas velocities. The bigger particles are concentrated in the central part of the bed, and their concentration decreases laterally from the spout to the annulus region. An increased concentration of finer particles is observed near the wall. The extent of near-wall segregation decreases with an increase in gas velocity.
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