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Solids exit discontinuity in slurry bubble columns
Author(s) -
de Bruijn T. J. W.,
Reilly I. G.,
Macintyre D.,
Scott D. S.
Publication year - 1989
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450670215
Subject(s) - slurry , bubble , discontinuity (linguistics) , drop (telecommunication) , superficial velocity , materials science , chromatography , chemistry , analytical chemistry (journal) , mechanics , composite material , flow (mathematics) , physics , mathematical analysis , telecommunications , mathematics , computer science
The exit discontinuity in slurry bubble columns, i.e., the difference in the apparent solids concentration at the very top of the column ( C t ) and the concentration in the effluent ( C e ), was studied in a 0.3 m ID bubble column, using air as the gas phase, water, a light hydrocarbon oil (Varsol) and trichloroethylene as liquids and glass beads of different sizes and density as solids. The results showed that the drop in solids concentration occurs in a very small layer at the gas/liquid interface. By changing the column exit configuration and removing the gas/liquid interface the exit discontinuity disappeared. The extent of the exit discontinuity depended on the liquid properties and appeared to be related to the foaming tendency of the liquid. In addition, in those systems where the exit discontinuity was significant, it depended on the solids properties and the gas and liquid superficial velocities.