Exploring the hydrodynamics of dense beds of Geldart B and D gas-fluidized particles through the analysis of capacitance probe signals
Résumé
The hydrodynamics of Geldart B and D solids dense fluidized beds, of spherical/irregular morphology, have been
characterized using capacitance probes at ambient temperature and 500 ◦C. A statistical approach applied to the
time series of local bed voidage reveals, at specific experimental conditions, a characteristic bimodal distribution
in the emulsion phase voidage: a more expanded, high-voidage, phase can be distinguished from a low-voidage
phase with values close to minimum fluidization condition. Quantitative and qualitative differences among
tested materials can be associated to different particles morphology. Emulsion phase voidages for the tested
samples collapse on the same characteristic value once normalized with the voidages at incipient fluidization
condition. The Richardson-Zaki equation proves to effectively correlate also in the bubbling fluidization regime
the voidage and gas superficial velocity in the emulsion phase. The influence of hydrodynamics of fluidized bed
dense phase on mass transfer in the emulsion phase is clearly highlighted.
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