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Hydrodynamic characteristics of a three‐phase inverse fluidized‐bed column
Author(s) -
Ibrahim Yasser A. A.,
Briens Cedric L.,
Margaritis Argyrios,
Bergongnou Maurice A.
Publication year - 1996
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690420710
Subject(s) - fluidization , fluidized bed , mechanics , materials science , pressure gradient , polypropylene , inverse , flow (mathematics) , pressure drop , chromatography , thermodynamics , chemistry , composite material , physics , geometry , mathematics
Gas–liquid–solid inverse fluidized beds were studied, in which the gas and the continuous liquid phase flow countercurrently fluidizing particles that are lighter than the liquid. Conductivity and static pressure measurements were combined to provide the vertical profiles of the gas, liquid and solid holdup, in beds of 4‐ or 6‐mm polypropylene particles with a density of about 870 kg/m 3 . Various bed heights were obtained with different measurement methods. The minimum fluidization velocity was estimated using the bed static pressure gradient. A new transition velocity, called the uniform fluidization velocity, was identified using conductivity measurements. This is the superficial liquid velocity at which the fluidization quality becomes the same throughout the bed.