2012 Fiscal Year Final Research Report
Improvement of efficiency on frictional drag reduction by repetitive bubble injection
| Project/Area Number |
23760143
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Fluid engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
TASAKA Yuji 北海道大学, 大学院・工学研究院, 准教授 (00419946)
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| Co-Investigator(Renkei-kenkyūsha) |
MURAI Yuichi 北海道大学, 大学院・工学研究院, 教授 (80273001)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 混相流 / 抵抗低減 |
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| Research Abstract |
In order to improve efficiency of frictional drag reduction technique by injecting bubbles, we investigated flow of bubble mixture and developed measurement system for efficient flow control. Experimental investigations in a bubbly channel flow suggested basic mechanism of bubble clustering from a point of view of bubble-bubble interactions. We also developed a monitoring tool of flows and bubbles using ultrasonic wave. Applicability of the tool for actual vessels was discussed.
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