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New look at wave analogy for prediction of bubble terminal velocities
Author(s) -
Maneri Charles C.
Publication year - 1995
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.690410306
Subject(s) - bubble , terminal velocity , mechanics , duct (anatomy) , analogy , plane (geometry) , terminal (telecommunication) , physics , classical mechanics , viscosity , geometry , mathematics , thermodynamics , engineering , medicine , telecommunications , linguistics , philosophy , pathology
The analogy between waves on the surface of an infinite fluid and bubbles rising in low‐viscosity fluids of infinite extent, originally proposed by Mendelson for 3‐D bubbles, has been used to predict the terminal velocity of plane bubbles. In terms of its terminal velocity, a plane bubble rising in a rectangular duct of small aspect (spacing‐to‐width) ratio behaves as if it were a 3‐D bubble rising in an infinite medium as long as the end walls (the walls in the widthwise direction) are sufficiently far apart. As the end walls are moved toward each other, a wall effect is found to exist. A general expression for the terminal velocity of a bubble of any size rising in a rectangular duct including this wall effect is also developed based on the wave analogy and shown to compare well with existing data.