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The effect of acoustic turbulence on mass transfer at a column wall
Author(s) -
Low D. I. R.,
Hodgins J. W.
Publication year - 1963
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.5450410603
Subject(s) - mass transfer , turbulence , intensity (physics) , oscillation (cell signaling) , boundary layer , mechanics , amplitude , turbulence kinetic energy , chemistry , analytical chemistry (journal) , physics , optics , chromatography , biochemistry
Measurements have been made of the mass transfer of naphthalene into an air stream in the presence of a standing sound wave propagated parallel to the surface. The flowrate range of the air stream was from Re = 100 to Re = 14,000. Concentration of the ablated naphthalene in the effluent air was measured by ultraviolet spectrophotometry. At the antinode for resonant frequency of 286 cps and a sound intensity of 154 db, mass transfer enhancement occurs at flowrates up to Re = 8,000; this enhancement is as large as 180% at low flows. The enhancement increases with sound intensity, and decreases with increasing frequency. At the node, the mass transfer was reduced in proportion to the intensity. The sound flux changes both concentration and velocity profiles in the column, probably by alteration of the boundary layer. Mass transfer enhancement appears to be a function of the ratio of oscillating velocity to superficial mean velocity. The significance of oscillation amplitude in the enhancement of mass transfer is established.