Validation of CFD-DEM Model for Size Segregation of Binary Mixtures in Gas-Solid Fluidized Beds

A numerical study on segregation behavior of binary mixtures in gas-solid fluidized beds was carried out in this work. The gas phase was modeled using the continuum theory and the solid phase was modelled by the discrete element method. Results of the model were validated by the experimental data on the extent of segregation published in literature. Simulation results are in good agreement with experimental data at different solid mixtures, initial bed heights and superficial gas velocities. Results showed that rearrangement and consequently segregation of particles potentially occur in loose regions of the bed. Increasing the gas velocity and mass fraction of small particles enhance the mixing of particles while decreasing the bed height promotes the segregation of particles in the bed