HYDRODYNAMIC STUDY OF ROTO-FLUIDIZED BED GRANULATORS .2. MINIMUM FLUIDIZATION GAS VELOCITY AND MINIMUM DISC REVOLUTION SPEED

Authors report results of experiments to determine the pressure drop o f air flowing through a roto-fluidised bed as a function of the gas ve locity. Measurements revealed that the minimum roto-fluidisation gas v elocity can be determined experimentally, as with conventional fluidis ed beds, by relatively simple means, from measurement of the pressure drop. Furthermore, the relative volume expansion of the roto-fluidised bed and the void fraction have been studied as functions of disc revo lution, and relationships derived for calculation of the minimum rotat ion speed.