The role of gas phase momentum in determining gas holdup and hydrodynamic flow regimes in bubble column operations
作者:
I. G. Reilly,
D. S. Scott,
T. J.W Debruijn,
D. Macintyre,
期刊:
The Canadian Journal of Chemical Engineering
(WILEY Available online 1994)
卷期:
Volume 72,
issue 1
页码: 3-12
ISSN:0008-4034
年代: 1994
DOI:10.1002/cjce.5450720102
出版商: Wiley Subscription Services, Inc., A Wiley Company
关键词: Keywords: bubble columns;gas holdup;momentum
数据来源: WILEY
摘要:
AbstractExperiments conducted in 0.15 m diameter bubble columns using water and non‐aqueous liquids have shown that the gas velocity at which transition from the bubbly flow to the churn‐turbulent flow regime occurs is a function of gas density. The transition velocity increased with increasing gas density. The direct effect of gas density on gas holdup in the bubbly flow regime is small with only a slight increase in holdup being observed at higher densities (ϵGα ρg0.04). In the churnturbulent region a much greater effect of gas density on gas holdup was observed. These differences were found to be a direct function of the differences in holdup values at the transition points. Gas holdup was found to be a function of the gas phase momentum. In the bubbly flow regime holdup was directly proportional to momentum while in the churn‐turbulent regime holdup was proportional to momentum to the one third power.Reasons for this behaviour are discussed, as well as the implied effects on liquid mixing in bubble column slurry reactors. The effects of gas density may offer an explanation for some apparently anomalous published
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