GAS HOLDUP AND MASS-TRANSFER CHARACTERISTICS OF CARBOXYMETHYL CELLULOSE SOLUTIONS IN A BUBBLE COLUMN WITH A RADIAL GAS SPARGER

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The gas phase holdup and mass transfer characteristics of carboxymethyl cellulose (CMC) solutions in a bubble column having a radial gas sparger have been determined and a new flow regime map has been proposed. The gas holdup increases with gas velocity in the bubbly flow regime, decreases in the churn-turbulent flow regime, and increases again in the slug flow regime. The volumetric mass transfer coefficient (k(L)a) significantly decreases with increasing liquid viscosity. The gas holdup and k(L)a values in the present bubble column of CMC solutions are found to be much higher than those in bubble columns or external-loop airlift columns with a plate-type sparger. The obtained gas phase holdup (epsilon(g)) and k(L)a data have been correlated with pertinent dimensionless groups in both the bubbly and the chum-turbulent flow regimes.
Publisher
SPRINGER VERLAG
Issue Date
1993-01
Language
English
Article Type
Article
Keywords

NON-NEWTONIAN SOLUTIONS; 3-PHASE FLUIDIZED-BED; AIRLIFT REACTOR; HYDRODYNAMICS; OXYGEN; LIQUID; BIOREACTORS; ABSORPTION; BREAKERS

Citation

BIOPROCESS ENGINEERING, v.8, no.5-6, pp.271 - 277

ISSN
0178-515X
URI
http://hdl.handle.net/10203/4467
Appears in Collection
CBE-Journal Papers(저널논문)
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