Discrimination of Models for Hydrodynamics in a Turbulent Bed Contactor (TBC) with Non-Newtonian Fluids
Hydrodynamics of a Turbulent Bed Contactor (TBC) using air as the gas phase, aqueous solutions of carboxy methyl cellulose (CMC) as the liquid phase, and polypropylene beads as the solid phase were investigated for gas velocities greater than minimum fluidization velocities. Aqueous solutions of CMC (which behaves as a non-Newtonian fluid) with apparent viscosities in the range of 5 to 25 cP were used. Pressure drop and liquid holdup were determined experimentally and the effect of liquid and gas velocities, static bed height, liquid flow rates, diameter and density of packing, and CMC concentration on liquid holdup were studied. Different models reported in the literature were compared and modifications are proposed that improves the predictability of the hydrodynamics. The predictions from the proposed models are in good agreement with the experimental data.