Direct method for the prediction of expanded bed height in liquid‐solid fluidization

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:\documentclass{article}\pagestyle{empty}\begin{document}$$ L_c = 1.27W/|\rho _H D^2 (1 ‐ 1.762U + 0.95U^2 )| $$\end{document}The relationship is valid over the voidage range from ϵ mf to ϵ r = 0.96 and gives directly the expanded bed height L e without the determination of the bed porosity ϵ e 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/cm 3 respectively while the range of Re t 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.