Abstract
The Harrison and Leung model for spherical bubble formation in fluidized beds has been extended to account for the dynamics of the emulsion phase. The simplified Davidson-Harrison model is used to obtain the gas and particle velocities in the emulsion phase and includes the effect of the bubble pressure, the change in hydrostatic pressure, grid orifice discharge rate, and gas leakage into the emulsion phase. Computations for the constant flow rate case agree well with measured gas leakage for beds of large particles. For large grid orifices, a simplified model explains the low frequencies observed experimentally for small flow rates.
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