ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Gas absorption by eddies at the free surface of a strongly turbulent liquid is interpreted quantitatively in terms of the Levich approach. The mass transfer coefficient is calculated to vary as Re to a relatively high power (1.3 to 1.5).Experiments on free turbulent jets of liquids in gas are in general accord with this theory. For turbulent films of liquids flowing over large roughness elements in “wake-interference” flow, the turbulence is anomalously efective in promoting gas absorption.Traces of surface-active agents suppress the surface renewal. This is analyzed theoretically: the results compare favorably with gas-absorption for stirred cells and flow experiments over smooth plates. For “wake-interference” flow over rough plates, the reduction in the rate of gas absorption by surface-active material is more pronounced than predicted for ordinary turbulence. But even in the presence of a surface-active agent, the roughness still gives an advantage in mass transfer rates as compared with smooth plates.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690180131
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