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Enhancement of large‐particle gas‐fluidization by adding liquid
Author(s) -
Nagahashi Y.,
Lee D. H.,
Grace J. R.,
Epstein N.,
Yokogawa A.,
Asako Y.
Publication year - 2003
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.690490312
Subject(s) - fluidization , pressure drop , particle (ecology) , drop (telecommunication) , chemistry , mechanics , particle size , thermodynamics , materials science , fluidized bed , physics , geology , organic chemistry , engineering , telecommunications , oceanography
There are circumstances where fluidization of particles by a gas can be promoted by the addition of small quantities of liquid, contrary to many reported cases where liquid impedes gas‐solid fluidization. Enhancement occurs only when the particles are larger than about 3 mm in diameter, the liquid and particles have similar densities (within ∼25%), and the particles are poorly wetted by the liquid. When these conditions are met, the liquid causes the minimum gas fluidization velocity U gmf to decrease and particle motion to be more vigorous. For low liquid loadings, U gmf and the pressure drop across the bed are then predicted well by a “modified liquid‐perturbed gas model.”