The Behavior of Bubbles in a Two-Dimensional Fluidized Bed with a Perforated Gas Distributor

In a two-dimensional fluidized bed with a perforated plate, several characteristics of initial bubbles formed just above holes and the changes of bubble frequency, volume and diameter with bed height were studied quantitatively. Characteristics of initial bubbles were expressed in empirical formulas. It was found that the two-phase theory could not be applied for the initial bubble of coarse particles of which the minimum fluidization velocity was large. The changes of bubble characteristics with bed height were estimated by two simple models where the results obtained for initial bubbles were employed as the initial values. Calculated results agreed well with experiment.