2005 Fiscal Year Final Research Report Summary
Experimental study on the bubble-droplet chain process by using the world fastest high-speed video camera
| Project/Area Number |
15360270
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
水工水理学
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| Research Institution | Kinki University |
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Principal Investigator |
TAKEHARA Kohsei Kinki University, School of Science and Engineering, Associate Professor, 理工学部, 助教授 (50216933)
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| Co-Investigator(Kenkyū-buntansha) |
ETOH Takeharu Kinki University, School of Science and Engineering, Professor, 理工学部, 教授 (20088412)
TAKANO Yasuhide Kinki University, School of Science and Engineering, Assistant professor, 理工学部, 講師 (80330231)
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| Project Period (FY) |
2003 – 2005
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| Keywords | gas transfer / water surfaces / wind waves / bubbles / droplets |
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| Research Abstract |
Gas transfer at sea surfaces is strongly dominated by disturbances close to the surface. White cap, which appear on the ocean surfaces when wind waves are breaking, is one of the most important processes in the gas transfer mechanisms. In the white caps, many bubbles are entrained into sea water and some of them are lifted up to surface. The bubbles at sea surfaces eventually burst and generate many small droplets. Similarly, some of the droplet fall down to sea surface again. This bubble-droplet chain process was experimentally investigated in this research.
A high-speed video camera, of which frame rate is 1,000,000 fps, was developed at Kinki University in 2001. The high-speed video camera is a powerful tool for investigation of the gas transfer at sea surface. In this research, this high-speed video camera was applied to visualization of the fundamental processes of the bubble-droplets chain process. The following processes are picked up as the fundamental processes.
(1)Air entrapment under an impacting drop
(2)Coalescence speed of two drops
(3)Coalescence speed of two bubbles
(4)Crown-breakup by the formation of Marangoni holes
And also the simultaneous plane measurement techniques of air and water flows close to wind wave interfaces was developed by using a Particle Tracking Velocimetry, which was developed at Kinki University.
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Research Products
(37 results)
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[Journal Article] An Image Sensor of 1,000,000 fps, 3,000,000 pixels, and 144 consecutive frames2005
Author(s)
T.Goji Etoh, Yuya Hatsuki, Tomoo Okinaka, Hirotaka Maruyama, Hiroshi Ohtake, Tetsuya Hayashida, Masato Yamada, Kazuya Kitamura, Toshiki Arai, Kenkichi Tanioka, Dirk Poggemann, Arno Ruckelshausen
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Journal Title
Proceedings of 26^<th> International Congress on High-speed Photography and Photonics, SPIE Vol.5580
Pages: 796-804
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] An Image Sensor Which Captures 100 Consecutive Frames at 1 000 000 Frames/s2003
Author(s)
T.Goji Etoh, Dirk Poggemann, Greg Kreider, Hideki Mutoh, Albert J.P.Theuwissen, Arno Ruckelshausen, Yasushi Kondo, Hiromasa Maruno, Kenji Takubo, Hideki Soya, Kohsei Takehara, Tomoo, Okinaka, Ysuhide Takano
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Journal Title
IEEE transactions on Electron Devices Vol.50, No.1
Pages: 4-151
Description
「研究成果報告書概要(欧文)」より
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