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Mechanism, onset and intensity of surface aeration in geometrically‐similar, sparged, agitated vessels
Author(s) -
Veljković V. B.,
Bicok K. M.,
Simonović D. M.
Publication year - 1991
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.5450690414
Subject(s) - impeller , aeration , entrainment (biomusicology) , mechanics , materials science , suction , free surface , intensity (physics) , vortex , chemistry , thermodynamics , physics , optics , acoustics , organic chemistry , rhythm
Under sparged conditions surface aeration occurs by two mechanisms: first, the absorption of gas at the free surface and then its desorption at the gas bubbles‐liquid interfaces, and second, mechanical suction through the free surface; the latter is believed to occur via vortices formed on the free surface due to impeller action. The onset of gas entrainment is defined through the characteristic impeller speed above which mechanical suction rapidly increases. Gas entrainment intensity is correlated by the specific power input and the superficial sparge velocity and generally increases with increasing impeller speed and decreasing sparge gas flow rate.