HYDRODYNAMIC STUDIES ON INVERSE GAS-LIQUID-SOLID FLUIDIZATION

Downward (inverse) fluidization can be achieved when the density of th e particles is less than that of the liquid and the liquid is the cont inuous phase. This technique is mainly used in biochemical engineering operations, e.g. for fermentation and waste water treatment. Experime nts were conducted to study the hydrodynamics of inverse gas-liquid-so lid fluidized beds using very light particles. The experimental data f or the minimum liquid velocity at the onset of fluidization are correl ated in terms of the physical properties of the fluids, particle chara cteristics and system variables. A correlation for the friction factor is also proposed.