Heat transfer from column wall to bed in spouted fluidized and packed systems



Heat transfer data have been obtained for heat flowing from a steam jacketed column to a packed, fluidized and spouted bed. The data for packed and fluidized beds are compared with generalized correlations previously proposed. In the case of spouted beds, the heat transfer coefficient increases sharply at the onset of spouting and passes through a maximum as the gas velocity is increased. The maximum heat transfer coefficient is from 25–75% lower for a spouted bed than for a fluidized bed under similar flow conditions. Rice, wheat and Ottawa sand were used as bed materials.