The gas contribution to heat transfer between fluidized beds of large particles and immersed surfaces

Abstract

The gas contribution to heat transfer between large particle fluidized beds and immersed surfaces is analysed through a heterogeneous model for the dense phase. An approximate solution of the governing balances provides a conceptually appropriate and precise enough expression for the gas heat transfer coefficient, h g . For most practical conditions h g amounts to 75—85% of the limiting heat transfer coefficient at the surface wall, h wg . The results are compared with previous correlations for experimental conditions at which they were formulated. The analogous mass transfer process is included in this analysis as a particular case of the proposed theory.