Bubbles injected into a turbulent boundary layer have a significant potential to reduce frictional shear stress, but this drag reduction technique has not been optimized yet because of its low and unstable performance. If monitoring and controlling of advective bubbles beneath ships are realized, these provide insight for improving the performance. In this paper, we performed experiments using a model ship with 4 m in length in a towing tank with 80 m in distance. The model ship is fully made of acrylic resin and mounts shear stress sensors and ultrasonic measurement system. The shear stress and bubble information, such as a void fraction and a thickness of liquid film above the bubbles, are obtained at three locations arranged at the front, the middle and the rear of the ship bottom plane. By analyzing these data, it is confirmed that the drag reduction occurs when a thin liquid film exists.
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ASME/JSME/KSME 2015 Joint Fluids Engineering Conference
July 26–31, 2015
Seoul, South Korea
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5732-8
PROCEEDINGS PAPER
Ultrasonic Measurement of Gas Bubbles Advecting Under a Ship Bottom for Investigating Drag Reduction Performance
Hyun Jin Park,
Hyun Jin Park
Hokkaido University, Sapporo, Japan
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Yuji Tasaka,
Yuji Tasaka
Hokkaido University, Sapporo, Japan
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Yoshihiko Oishi,
Yoshihiko Oishi
Muroran Institute of Technology, Muroran, Japan
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Yuichi Murai
Yuichi Murai
Hokkaido University, Sapporo, Japan
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Hyun Jin Park
Hokkaido University, Sapporo, Japan
Yuji Tasaka
Hokkaido University, Sapporo, Japan
Yoshihiko Oishi
Muroran Institute of Technology, Muroran, Japan
Yuichi Murai
Hokkaido University, Sapporo, Japan
Paper No:
AJKFluids2015-20242, V01AT20A004; 6 pages
Published Online:
April 4, 2016
Citation
Park, HJ, Tasaka, Y, Oishi, Y, & Murai, Y. "Ultrasonic Measurement of Gas Bubbles Advecting Under a Ship Bottom for Investigating Drag Reduction Performance." Proceedings of the ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. Volume 1A: Symposia, Part 2. Seoul, South Korea. July 26–31, 2015. V01AT20A004. ASME. https://doi.org/10.1115/AJKFluids2015-20242
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