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Dynamics of bubble growth and detachment from a needle

Published online by Cambridge University Press:  26 April 2006

Hasan N. Oguz  and
Andrea Prosperetti
Hasan N. Oguz
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 2128, USA
Andrea Prosperetti
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 2128, USA
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Abstract

Several aspects of the growth and departure of bubbles from a submerged needle are considered. A simple model shows the existence of two different growth regimes according to whether the gas flow rate into the bubble is smaller or greater than a critical value. These conclusions are refined by means of a boundary-integral potential-flow calculation that gives results in remarkable agreement with experiment. It is shown that bubbles growing in a liquid flowing parallel to the needle may detach with a considerably smaller radius than in a quiescent liquid. The study also demonstrates the critical role played by the gas flow resistance in the needle. A considerable control on the rate and size of bubble production can be achieved by a careful consideration of this parameter. The effect is particularly noticeable in the case of small bubbles, which are the most difficult ones to produce in practice.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 257 , December 1993 , pp. 111 - 145
Copyright
© 1993 Cambridge University Press

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