Phase holdup characteristics of three phase fluidized beds

Abstract

The individual phase holdups in two (liquid‐air, liquid‐solids) and three (liquid‐air‐solids) phase fluidized beds have been measured over a wide range of liquid and gas velocities. Ex‐periments were canied out in a large two‐dimensional bed. Three solids were used ranging in size from 1 to 6 mm. The effect of viscosity (1‐70 cp) was determined using solutions of sugar and carboxymethyl cellulose of different concentrations. Various acetone‐water mixtures were employed to examine the effect of surface tension in the range 40‐73 dyne/cm. Beds of particles having a minimum fluidizing velocity in the liquid of less than 1.28 cm/sec were found to initially contract upon the injection of gas. In contrast, beds of particles having minimum fluidizing velocities exceeding tins value were found to expand.

Effect of internal on phase holdups of a three-phase fluidized bed

“…• The present experimental data on gas holdup and liquid holdup and bed porosity were in good agreement with the equations proposed by earlier investigators [10][11][12][13].…”

Liquid-wall mass transfer in three phase fluidized beds with cross-flow of electrolyte

“…The minimum liquid fluidization velocity data in liquid-solid fluidized beds is in accordance with Ergun equation [12]. In three-phase fluidized beds, the solids holdup is determined from bed height measurements and the bed porosity data thus obtained were found to obey the equation of Kim et al [13]. The gas holdup data were determined from pressure drop measurements and were found to agree with the equation of Soung [14].…”

Axial holdup distributions of gas and solid particles in three-phase fluidized bed for gas-liquid(slurry)-solid systems.

“…(9) with the data of Ep in the lean region of the three-phase fluidized bed indicates that the correction factor in Eq. (9) should be replaced by (7), (9) and (10).…”