ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
The measurement of gas-liquid interfacial areas and mass transfer coefficients in concurrent upward bubbly flow (uG from 0.02 to 0.16 m/s, uL 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 O2 into Na2SO3 solutions; volumetric mass transfer coefficients were measured by physical desorption of O2 into N2 bubbles. Surface areas were obtained in the range of 4 × 103 to 2 × 105 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 kLaG are also high (0.1 〈 kLaG 〈 2.3 s-1), primarily as a result of high gas-liquid interfacial areas. Mass transfer coefficients kL are small, however. For the smaller bubble dispersions, mass transport is controlled by diffusion rather than by convection.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690340912
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