Stirred‐tank mechanical power requirement and gas holdup in aerated aqueous phases
作者:
Ibrahim T. M. Hassan,
Campbell W. Robinson,
期刊:
AIChE Journal
(WILEY Available online 1977)
卷期:
Volume 23,
issue 1
页码: 48-56
ISSN:0001-1541
年代: 1977
DOI:10.1002/aic.690230109
出版商: American Institute of Chemical Engineers
数据来源: WILEY
摘要:
AbstractGas holdup and the ratio of the turbulent regime mechanical power consumed in aerated compared to that in nonaerated aqueous phases were measured in two laboratory sized tanks. Standard six‐blade turbine (D/T= 1/3), six‐blade paddle (D/T= 1/3), and four‐blade paddle (D/T= 2/3) impellers were used over a wide range of impeller rotational speed and gas sparging rate. For all systems, the power ratio results were found to fit a semitheoretical correlation (derived from dimensional analysis) involving the impeller Weber number, the aeration number, and the ratio of dispersion and liquid densities. Empirical correlations for gas holdup in water, aqueous solutions of nonelectrolytes, and an aqueous electrolyte solution are given. The overall results lead to the conclusion that power ratio and gas holdup correlations are highly specific to a particular impeller type and are also dependent on the tank size and the liquid phase physicochemical prope
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