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On the Skin Friction Reduction Mechanisms of Microbubbles (Keynote)

[+] Author Affiliations
Yoshiaki Kodama

National Maritime Research Institute, Tokyo, Japan

Paper No. FEDSM2003-45643, pp. 631-638; 8 pages
doi:10.1115/FEDSM2003-45643
From:
  • ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
  • Volume 1: Fora, Parts A, B, C, and D
  • Honolulu, Hawaii, USA, July 6–10, 2003
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3696-7 | eISBN: 0-7918-3673-8
  • Copyright © 2003 by ASME

abstract

The skin friction reduction effect of microbubbles in various flow conditions are reviewed. At location immediately downstream from an air injection point, the reduction does not depend on the flow speed, but at further downstream, it becomes smaller at higher flow speed, and decays with downstream distance. Experiments in a towing tank using a very long flat plate show that the reduction persists up to nearly 50m. In a full scale experiment using a 105m-long ship, 5.5% drag reduction was obtained. In case the bubbles are away from the wall, the skin friction increases. An optical technique has shown that bubbles in a boundary layer increase velocity fluctuations but decrease the Reynolds shear stress. Three possible skin friction reduction mechanisms are listed.

Copyright © 2003 by ASME

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