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

TLDR: In this article, 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 valid over the voidage range from ϵmf to ϵr = 0.96 and gives directly the expanded bed height.

Abstract: 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. On a etabli une correlation simple pour prevoir l'expansion d'un lit fluidise en phase liquide, forme de particules de dimensions et/ou de densite variables; cette correlation est de la forme suivante: Cette relation est valable sur une gamme de degre de vide de ϵmf a ϵe = 0.96, et fournit directement la hauteur Le du lit, sans qu'on ait a determiner la porosite ϵe du lit, comme c'est le cas pour les autres correlations existantes. Les dimensions des solides variaient entre 30/40 et 72/80 mailles BSS et leurs densites etaient comprises entre 1.67 et 4.33 g/cc, alors que Ret variait entre 0.12 et 43.66. On a calcule que pour un rapport L/D de 2, les ecarts normaux dans le cas des mesures effectuees dans des systemes a composants simples et multiples etaient respectivement de 11.5% et 19.6.%