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Acoustic emulsification. Part 2. Breakup of the large primary oil droplets in a water medium

Published online by Cambridge University Press:  19 April 2006

M. K. Li  and
H. S. Fogler
M. K. Li
Affiliation:
Department of Chemical Engineering, University of Michigan, Ann Arbor Present address: General Electric Corporate Research and Development, Schenectady, New York.
H. S. Fogler
Affiliation:
Department of Chemical Engineering, University of Michigan, Ann Arbor
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Abstract

A theoretical model is presented for the liquid-liquid emulsification phenomenon based on the deformation and breakup of an oil droplet exposed to a cavitation shock wave generated by an acoustic field. The model predicts a relationship between the Ohnesorge number and the critical Weber number ratio for long acoustic irradiation times. At short irradiation times, the mean particle size and variance decrease with increasing time of acoustic irradiation. The results show remarkable agreement when compared with results obtained from the studies on liquid droplets exposed to shock impact from a gas stream. The mechanism for acoustic emulsification is that large oil droplets originally formed from the instability oil-water interface are disintegrated into smaller ones by the cavitation until a critical size, characteristic of the particular oil-water system, is reached.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 88 , Issue 3 , 13 October 1978 , pp. 513 - 528
Copyright
© 1978 Cambridge University Press

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