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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.
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Hasan N. Oğuz
Andréa Prosperetti
Journal of Fluid Mechanics
Johns Hopkins University
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Oğuz et al. (Wed,) studied this question.
www.synapsesocial.com/papers/6a12ae9b92637892a9a70d51 — DOI: https://doi.org/10.1017/s0022112093003015