A CFD study of a bi-disperse gas-solid fluidized bed: Effect of the EMMS sub grid drag correction

摘要

For the first time the bubble-based EMMS drag model developed for a mono-disperse system has been extended to simulate a bi-disperse fluidized bed in conjunction with the multi-fluid model. Simulations with the EMMS drag model reveal that the system attains a fluidized state earlier. Furthermore the model predicts bed height and voidage in better agreement with data from the literature. Inclusion of the sub-grid drag correction is found to have a significant effect on the predicted axial pressure drop profile, mixing and segregation behavior, granular temperatures and turbulent kinetic energy. The effect of the specularity coefficient on the mixing index is also investigated. (C) 2015 Elsevier B.V. All rights reserved.