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Purged pressure probes and a data reduction method by means of a rectangular pressure drop pulse (RPDP) have been developed to measure pierced bubble size and velocity for Group A powders using specially prepared size fractions of FCC powders in a 0.152 m fluidization column. Measurement results show that there exists an equilibrium bubble size of about 4 cm for FCC powders smaller than 70 μm, and...
A purged pressure probe has been developed to trace the change of pressure drop with time in the collapse process, and hence the dense-phase voidage and the gas velocity in the dense phase can be obtained. The dense-phase voidage and the gas velocity in the dense phase were investigated in the bubbling fluidized beds of Group A powders of FCC particles with mean sizes from 26 to 130 μm. The results...
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