Effects of particle rotation on the hydrodynamic modeling of segregation in gas-fluidized beds

A multi-fluid Eulerian model has been improved by incorporating particle rotation using a simple kinetic theory for rapid granular flow of slightly frictional spheres. The model was implemented without changing the current kinetic theory framework by introducing an effective coefficient of restitution to account for additional energy dissipation due to frictional collisions. Simulations with and without particle rotation were performed to study the bubble dynamics in a monodispersed gassolid fluidized bed and the segregation phenomena in a bidispersed gas-solid fluidized bed. Results were compared between simulations with and without particle rotation and with corresponding experimental results. It was found that the multi-fluid model with particle rotation better captures the bubble dynamics and time-averaged bed behavior. The model predicted lower segregation percentages and a lower segregation rate due to increased bubble intensity.