HEAT-TRANSFER MECHANISM DUE TO PARTICLE CONVECTION IN CIRCULATING FLUIDIZED-BED

The nature of heat transfer in circulating fluidized beds (CFBs) by pa rticle convection was revealed from the experimental results of the pa rticle flux in the lateral direction. As particles contact and rebound from the heat transfer surface because of their lateral motion, they establish a large local temperature gradient. Heat from particles is t hen transferred primarily through the gas to the heat transfer surface . The data of the lateral particle flux provide a basis to establish a model of heat transfer in CFBs.