Gas transfer in a bubbly wake flow

A. Karn, J. S. Gulliver, G. M. Monson, C. Ellis, R. E.A. Arndt, J. Hong

Research output: Contribution to journalConference articlepeer-review

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The present work reports simultaneous bubble size and gas transfer measurements in a bubbly wake flow of a hydrofoil, designed to be similar to a hydroturbine blade. Bubble size was measured by a shadow imaging technique and found to have a Sauter mean diameter of 0.9 mm for a reference case. A lower gas flow rate, greater liquid velocities, and a larger angle of attack all resulted in an increased number of small size bubbles and a reduced weighted mean bubble size. Bubble-water gas transfer is measured by the disturbed equilibrium technique. The gas transfer model of Azbel (1981) is utilized to characterize the liquid film coefficient for gas transfer, with one scaling coefficient to reflect the fact that characteristic turbulent velocity is replaced by cross-sectional mean velocity. The coefficient was found to stay constant at a particular hydrofoil configuration while it varied within a narrow range of 0.52-0.60 for different gas/water flow conditions.

Original languageEnglish (US)
Article number012020
JournalIOP Conference Series: Earth and Environmental Science
Issue number1
StatePublished - May 20 2016
Event7th International Symposium on Gas Transfer at Water Surfaces - Seattle, United States
Duration: May 18 2015May 21 2015

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© Published under licence by IOP Publishing Ltd.


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