| 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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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥11,700,000 (Direct Cost: ¥11,700,000)
Fiscal Year 2005: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2004: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 2003: ¥6,900,000 (Direct Cost: ¥6,900,000)
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| Keywords | gas transfer / water surfaces / wind waves / bubbles / droplets / 水滴生成 / 気泡混入 / 表面張力 / 粘性 / 気泡の破裂 / 水滴の衝突 / 水表面の物質輸送 / 画像トリガー |
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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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