STUDY OF ROTARY FLUIDIZED-BED DRIERS .2. HEAT AND MASS-TRANSFER IN THE INERT PACKING

Methods for the calculation of heat and mass transfer coefficients bas ed on experimental data are presented, with special regard to gas mixi ng (back-mixing) conditions. Changes in the voidage of fluidised bed v s. linear gas and height of the fluidisation chamber are shown in diag rams. Heat and mass transfer coefficients are calculated considering t he so-called ''driving force'' as determined in several ways. Results are presented in Tables. In the calculations, gas back-mixing was also considered, as determined by analogies between conventional fluidised and rotary fluidised beds.