TOWARDS A GENERALIZED-MODEL FOR VERTICAL WALLS TO GAS-SOLID FLUIDIZED-BEDS HEAT-TRANSFER .2. RADIATIVE-TRANSFER AND TEMPERATURE EFFECTS

The radiative heat transfer is combined with the heterogeneous model a ccounting for conduction and convection proposed in the first part of this paper in order to determine heat transfer coefficients in high-te mperature fluidized beds. The effects of parameters such as particle s ize, emissivities of particle and walls, bed and wall temperatures, he at flux direction, etc., are investigated systematically and the relat ive importance of each component at different conditions is considered . A comparison of the predicted results with the experimental data in the literature shows a reasonable agreement in a large range of partic le diameters and temperatures.