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Liquid—solid mass transfer at vertical screens in bubble columns
Author(s) -
Zaki M. M.,
Nirdosh I.,
Sedahmed G. H.
Publication year - 1997
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.5450750208
Subject(s) - sparging , mass transfer , froude number , reynolds number , schmidt number , limiting current , bubble , mechanics , chemistry , sherwood number , potassium ferricyanide , analytical chemistry (journal) , thermodynamics , materials science , electrochemistry , electrode , chromatography , physics , flow (mathematics) , nusselt number , turbulence , organic chemistry
The effect of gas sparging on the rate of mass transfer at a vertical single screen was studied by an electrochemical technique which involved measuring the limiting current of the cathodic reduction of potassium ferricyanide. Variables studied were screen characteristics, physical properties of the solution and gas superficial velocity. Screen characteristics, e. g., mesh number and wire diameter were found to have little effect on the rate of mass transfer. The data at different screens were correlated in terms of the superficial gas velocity by the equation St Sc 0.5 = 0.095 ( Re Fr ) − 0.272 , where St is Stanton number, Sc is Schmidt number, Re is Reynolds number and Fr is Froude number. Comparison of the present data with previous results obtained with different transfer geometries has shown that screens produce higher rates of mass transfer than other geometries. The importance of the present work to catalytic and electrochemical reactor design was noted.