Measurements of mass transfer rates in a rectangular liquid fluidised bed using LCDT

Abstract

Ionic mass transfer from electrolyte to a plate cathode in liquid fluidised bed filled with spherical inert particles has been experimentally studied. The mass transfer rates were measured by using the limiting current diffusion technique (LCDT) in ferri- and ferrocyanide electrolyte systems. The effects of bed height and electrode location from the bottom of test chamber in different electrolyte concentrations and flow velocities on mass transfer coefficient were evaluated. Ranges of the variables used in the study are as follows: Reynolds number=78–300, Galileo number=282,000–298,000, density number=0.335–0.370 and Schmidt number=1831–1995. Experimental data are correlated as follows, by non-linear regression using Statistica Package Program: Sh = 0.199 Re p 3 5 Ga 1 10 Mv 7 2 Sc 1 3 ( d eq E L ) 3 10 ( d eq L Y ) − 3 4 . A comparison between the present data and related several literature correlation's has been achieved by calculating absolute ( σ A) and relative ( σ R) deviations. The deviations in present study are less than those in the literature cited.