PARTICLE DISPERSION IN A BINARY SOLID-LIQUID FLUIDIZED-BED

The mixing and segregation behavior of liquid fluidized beds containin g two different-sized particle species are described mathematically. T his model is based on a mass balance, rather than a volume balance, wh ich has been used by most previous researchers. The model also include s the effects of density gradients that are present in the bed. Partic le dispersion coefficients in a binary-solid fluidized bed are evaluat ed using this model. Further, a correlation that allows the calculatio n of these particle dispersion coefficients is presented, which descri bes not only dispersion coefficients calculated using the above model, but also those presented by other researchers. It is applicable over a broad range of variables of practical interest and is based on relev ant dimensionless parameters to account for the influence of important particle and fluid properties on the particle dispersion characterist ics.