A simple correlation has been developed to predict the expansion of a liquid fluidized bed, consisting of particles varying in size and/or density, which is of the following form:
The relationship is valid over the voidage range from ϵmf to ϵr = 0.96 and gives directly the expanded bed height Le without the determination of the bed porosity ϵe as in existing correlations. The size and density of the solids varied from 30/40 to 72/80 mesh BSS and from 1.67 to 4.33 gm/cm3 respectively while the range of Ret varied from 0.12 to 43.66. The standard deviation for measurements on unicomponent and multicomponent systems has been calculated to be 11.5% and 19.6% respectively at an L/D ratio of 2.0.
During elutriation of binary mixtures of solids differing in size and/or density, it has been found that the rate of decrease in concentration of the finer/lighter component is very fast at the beginning, falls off gradually and assumes an asymptotic value towards the end. The bed at this latter condition seems to have attained a retentive capacity for finer/lighter particles and this concentration has been termed the equilibrium bed concentration, CE. For all practical purposes, this sets the lower limit which the concentration of the elutriating component in the bed can attain, i.e. the maximum degree of removal of the particles from the system under a given set of operating conditions. Based on the experimental values of CE obtained from concentration versus time plots, an empirical correlation has been proposed as follows:
The correlation coefficient and the per cent standard deviation have been calculated to be 0.943 and 20.0, respectively.
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