Experimental studies of heat transfer between bundle of horizontal tubes and a gas-solid fluidized bed.

Experimental data are obtained for heat transfer coefficient between electrically heated horizontal smooth tube bundles and square fluidized beds of silica sand and alumina as a function of air fluidizing velocity. The data are compared with a single tube under otherwise identical conditions and are compared with existing correlations in the literature for maximum heat transfer coefficient. A correlation for the maximum heat transfer coefficient is proposed which includes the influence of tube pitch in the bundle. (from authors abstract)