A UNIFIED CORRELATION FOR THE PREDICTION OF HEAT-TRANSFER COEFFICIENTS IN LIQUID SOLID FLUIDIZED-BED SYSTEMS/

In recent years, there has been considerable interest in the developme nt of solid-liquid fluidized bed heat exchangers for efficient utiliza tion of energy and for the control of heat transfer surface fouling. H owever, the design for optimum heat transfer remains uncertain and ess entially empirical. In this study, a data bank containing a large numb er of measured heat transfer coefficients over a wide range of operati onal parameters (solid and liquid phase physical properties and heat t ransfer surface configurations) are compared with the prediction of al most all available correlations in the literature. A unified model for the prediction of heat transfer coefficients for Mall-to-bed and imme rsed heater-to-bed systems is presented which predicts the published e xperimental data with good accuracy.