Abstract
AbstractAn intrusive bioptical probe provides radial profiles of the PDF (probability density function) of the bubble, the cloud, and the emulsion phases behaviors in a fluidized bed of Geldart‐A particles. The fluidizing velocity ranges between 0.20 and 0.80 m/s. The bed porosity, the overall averaged bubble chords and velocities are well‐predicted by correlations of the literature. The cloud thickness is closely related to the bubble chord. The amount of gas traveling through the bubble phase never exceeds 15–20% of the total gas flow rate. The averaged porosity of the bubble, the cloud and the emulsion phases is of 88–92%, 65–70%, and 50–55%, respectively. The reduced bubble porosity distribution obeys a constant normal law over the fluidizing velocity range. Each distribution of the reduced bubble chord and velocity, and of the reduced cloud thickness obey a constant log normal law over the fluidizing velocity range. © 2007 American Institute of Chemical Engineers AIChE J, 2008
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