MODELING OF MULTI-SOLID LIQUID FLUIDIZED-BED

A dynamic model of the liquid fluidized bed containing two or more sol id particle species of different size and density is presented. The mo del incorporates the particle mass transport mechanisms of the convect ion and the dispersion. The movement of the upper interface of the bed subject to a change in the liquid velocity is specified using the mas s balance constraint. The particle velocities and dispersion coefficie nts are evaluated using correlations. The model is capable of describi ng the bed expansion, concentration profiles of the individual particl e species, the bulk density profile, and the occurrence of layer inver sion.