RADIAL PARTICLE-FLUX AND MOMENTUM-TRANSFER IN THE CIRCULATING FLUIDIZED-BED

The solid particle concentration distribution in the riser of a Circul ating Fluidized Bed (CFB) is dilute at the center and dense near the w all because of the axial particle momentum exchange. In our study, the radial particle concentration distribution was investigated theoretic ally and experimentally. To assess the radial particle motion, a speci al flux probe was designed. We found that near the wall, the radial pa rticle flux was much higher then the net axial particle flux, and that the measured radial profile of particle flux was similar to that of t he particle concentration. The resulting radial flux is very valuable in developing a model of heat transfer between the gas-particle suspen sions and the wall surface.