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Mass transfer from dispersed bubbles to electrolyte solution in packed beds
Author(s) -
Takahashi Ken M.,
Alkire Richard C.
Publication year - 1988
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690340912
Subject(s) - mass transfer , bubble , electrolyte , chemistry , absorption (acoustics) , desorption , diffusion , analytical chemistry (journal) , packed bed , mass transfer coefficient , thermodynamics , range (aeronautics) , materials science , chromatography , mechanics , adsorption , electrode , physics , composite material
The measurement of gas‐liquid interfacial areas and mass transfer coefficients in concurrent upward bubbly flow ( u G from 0.02 to 0.16 m/s, u L from 0.0051 to 0.056 m/s) over a packed bed consisting of 1.2 mm glassy carbon particles is described. Specific surface areas were measured by chemical absorption of O 2 into Na 2 SO 3 solutions; volumetric mass transfer coefficients were measured by physical desorption of O 2 into N 2 bubbles. Surface areas were obtained in the range of 4 × 10 3 to 2 × 10 5 m −1 , much higher than have been previously reported. High areas are related to the use of electrolytes and small packing particles. Bubble size was found to depend primarily on liquid velocity. Volumetric mass transfer coefficients k L a G are also high (0.1 < k L a G < 2.3 s −1 ), primarily as a result of high gas‐liquid interfacial areas. Mass transfer coefficients k L are small, however. For the smaller bubble dispersions, mass transport is controlled by diffusion rather than by convection.