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Effect of Bubble Size on the Microbubble Drag Reduction of a Turbulent Boundary Layer

[+] Author Affiliations
Takafumi Kawamura

University of Tokyo, Tokyo, Japan

Yasuhiro Moriguchi, Hiroharu Kato

Toyo University, Japan

Akira Kakugawa, Yoshiaki Kodama

National Maritime Research Institute, Japan

Paper No. FEDSM2003-45645, pp. 647-654; 8 pages
doi:10.1115/FEDSM2003-45645
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

Three different methods have been investigated for generating microbubbles to control the bubble diameter separately from the main flow velocity. The first two methods achieve this by adjusting the local shear stress where bubbles are generated, while the third method uses foaming of dissolved air to generate very small bubbles. The average diameter of bubbles was successfully controlled by the first two method within the range of 0.5–2 mm for the fixed main flow velocity of U = 3 m/s, while the very small bubbles of 20–40 μm were generated by the third method. The influence of the bubble diameter on the frictional drag reduction was found to be insignificant for the diameter range of 0.5–2 mm, while we also obtained experimental results suggesting that smaller bubbles on the order of 10 μm in diameter can be effective for the drag reduction.

Copyright © 2003 by ASME

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