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.
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ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
July 6–10, 2003
Honolulu, Hawaii, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-3696-7
PROCEEDINGS PAPER
Effect of Bubble Size on the Microbubble Drag Reduction of a Turbulent Boundary Layer Available to Purchase
Takafumi Kawamura,
Takafumi Kawamura
University of Tokyo, Tokyo, Japan
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Yasuhiro Moriguchi,
Yasuhiro Moriguchi
Toyo University, Japan
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Akira Kakugawa,
Akira Kakugawa
National Maritime Research Institute, Japan
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Yoshiaki Kodama
Yoshiaki Kodama
National Maritime Research Institute, Japan
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Takafumi Kawamura
University of Tokyo, Tokyo, Japan
Yasuhiro Moriguchi
Toyo University, Japan
Hiroharu Kato
Toyo University, Japan
Akira Kakugawa
National Maritime Research Institute, Japan
Yoshiaki Kodama
National Maritime Research Institute, Japan
Paper No:
FEDSM2003-45645, pp. 647-654; 8 pages
Published Online:
February 4, 2009
Citation
Kawamura, T, Moriguchi, Y, Kato, H, Kakugawa, A, & Kodama, Y. "Effect of Bubble Size on the Microbubble Drag Reduction of a Turbulent Boundary Layer." Proceedings of the 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. pp. 647-654. ASME. https://doi.org/10.1115/FEDSM2003-45645
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