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

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.

Design of a Fluidized Bed Bioartificial Liver

“… The graph shows the influence of the superficial velocity u (divided by the terminal velocity u t ) on the fluidized bed porosity ε: (○) experimental data. The results are compared with different models: – – – Foscolo et al (18), … Richardson and Zaki (15), —— Hirata and Bulos (17), —— Ganguli (16), and —— our . …”

“…where the value of the exponent n depended on Re t . Depending on the phases employed, other authors developed their own correlations (16)(17)(18). The study of the literature underscores the empirical characteristics of the proposed laws and the discrepancy between predictions and observed behavior, revealing the specificity of each system.…”

Heat transfer in liquid-fluidized beds affected by column wall

“…This may be caused by the method of calculation of the void fraction. The latter is known to be linear with fluid velocity in a log-log plot, but in the high void fraction region experimental data deviate from the linear correlation [10][11][12]. Since Eq.…”

Prediction of polydispersed fluidized bed system properties: A new approach

“…The experimental setup used for the present study has been described elsewhere (Ganguly, 1980). Essentially, it consisted of a cylindrical fluidizing column, made of plexiglass, which had an inside diameter of 49.2 mm and a height of 930 mm.…”