Heat transfer between a horizontal tube and a gas-solid fluidized bed

Abstract

Experiments have been conducted to measure the heat transfer coefficient between an electrically heated single horizontal tube and air-solid fluidized beds of glass beads, dolomite, sand, silicon carbide and alumina particles. The effect of size, shape and density of the particle, specific heat, air mass fluidizing velocity, tube size, tube material, bed depth, heat flux and distributor design on heat transfer rate has been investigated. Experimental results of heat transfer coefficient, h w, are compared with the predictions of the existing correlations for these quantities. These correlations are found to be inadequate to reproduce the present data. Therefore a correlation has been proposed for h w on the basis of our experimental data and examined to assess its appropriateness on the basis of available data in the literature.