Abstract
A semiempirical model of the dynamics of the expansion of a gas-solid fluidized bed can portray the experimentally observed nonuniform static porosity as well as the transient distribution. The model contains only a single adjustable parameter, the coefficient of the bed expansion rate, which varies along the bed height. Its value increases as the gas velocity increases; however, it is only slightly dependent on the bed mass except for a very shallow bed. The predicted value of the time to complete the bed expansion appears to agree with the results of approximate measurements by visual observations. Propagation of the initial disturbance near the jet zone could be described by the model.
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