P. Sen Gupta

Rate of mass transfer in a semifluidized bed

Abstract Data on mass transfer in a semifluidized bed have been obtained for 2-naphthol-, succinic acid-, and ammonium oxalate-water systems. The parameters investigated include particle size (0.043–0.187 cm), initial bed height (2–10 cm), bed expansion ratio (3–10) and flow rates. Two correlations have been suggested for predicting volumetric mass-transfer coefficients, k L a . In the first case, k L a has been correlated as a function of particle Reynolds number, bed expansion ratio and particle-to-column diameter ratio, while in the latter, the generalized approach for predicting mass-transfer coefficient applicable to packed and fluidized beds, has been extended to semifluidization.

Prediction of the pressure drop across a gas—solid semi-fluidized bed

Abstract The necessity of having a generalized correlation for the prediction of the pressure drop across a semi-fluidized bed is stressed. Pressure drops acros

Some studies in the leaching of rock phosphate in a jet contactor

Abstract Rock phosphate was leached with dilute sulphuric acid in an ejector—contactor. The effect of parameters such as leaching temperature, particle size,

Friction factor in a semifluidized bed

Abstract Experimental data on pressure drop in liquid—solid semifluidization have been interpreted in terms of a newly defined friction factor (f), which has been successfully correlated as a function of particle Reynolds number. The concept of f has been found to be applicable for gas—solid systems as well