(740b) Effect of Different Gas-Solid and Solid-Solid Drag Models On the Segregation of a Binary Mixture of Powders in a Circulating Fluidized Bed

Computational Fluid Dynamics (CFD) tools are increasingly used in academia and industry to model multiphase flows with heat and mass transfer to predict and optimize chemical reactors. The continuum description of multiphase flows based on granular kinetic theories is an especially attractive approach due to its fast execution time on today’s computer clusters. The reliability of the computer results for the fluidization of poly-disperse powders is still questionable and in need of further validation studies. This work presents numerical results based on several continuum models for the fluidization of a bi-disperse powder with different size and same density in a circulating fluidized bed. The numerical results obtained in this effort were compared to other numerical and experimental data published in the open literature. Specifically, several gas-solids drag functions obtained experimentally or by direct numerical simulations were investigated. Also, several solids-solids drag correlations available in the literature were tested to investigate the axial segregation of powders. Both 2D and 3D simulations were conducted and the results will be presented at the meeting