Controlled emission of microbubbles into a water flow boundary layer appears to be a promising means to significant reduction of frictional drag on ships. Theoretical analyses and hypotheses require that particularly small (∼ 100 micrometers or less) gas bubbles be emitted and retained in particular laminae close to the wetted surface. Drag reduction economy requires that the quantity of gas emitted be very small. Here a design of a controllable microbubble emitter which meets both demands above is put forth. The two key requirements governing the design are pulsed operation, which expels a known volume of air during each cycle, and a known number of uniformly-sized micro-holes, which determines bubble number and therefore bubble diameter. A first, proof-of-concept experiment with a modified pulsed-pressure design of the proposed microbubble emitter was carried out and shows promise.
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ASME 2005 Fluids Engineering Division Summer Meeting
June 19–23, 2005
Houston, Texas, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-4198-7
PROCEEDINGS PAPER
A Controllable Microbubble Emitter
Martin Wosnik
Martin Wosnik
University of Minnesota, Minneapolis, MN
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Neal A. Brown
Float, Inc., San Diego, CA
Martin Wosnik
University of Minnesota, Minneapolis, MN
Paper No:
FEDSM2005-77140, pp. 33-41; 9 pages
Published Online:
October 13, 2008
Citation
Brown, NA, & Wosnik, M. "A Controllable Microbubble Emitter." Proceedings of the ASME 2005 Fluids Engineering Division Summer Meeting. Volume 1: Symposia, Parts A and B. Houston, Texas, USA. June 19–23, 2005. pp. 33-41. ASME. https://doi.org/10.1115/FEDSM2005-77140
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