| Project/Area Number |
13650210
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | National Institute of Advanced Industrial Science and Technology (AIST) (2002)
The University of Tokyo (2001) |
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Principal Investigator |
TAKEMURA Fumio National Institute of Advanced Industrial Science and Technology, Institute for Energy Utilization, Senior Research Scientist, エネルギー利用研究部門, 主任研究員 (20313041)
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| Co-Investigator(Kenkyū-buntansha) |
大宮司 啓文 東京大学, 大学院・新領域創成科学研究科, 講師 (10302754)
飛原 英治 東京大学, 大学院・新領域創成科学研究科, 教授 (00156613)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2001: ¥3,000,000 (Direct Cost: ¥3,000,000)
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| Keywords | Bubble / Ultrasonic Wave / Capillary wave |
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| Research Abstract |
Micro gas bubble generation using ultrasonic wave was investigated experimentally. We found that micro bubbles with around 10μm in average are stably generated from a needle in an ultrasonic field when we supply gas through the needle at several μl/min. In this paper, to clarify the mechanism of the micro bubble generation using ultrasonic wave, we measured the size distribution of the bubbles released from the needle with a microscope. We also investigated the effect of the exited frequency of the ultrasonic wave on the average bubble diameter and the applicability of an analytical expression for a droplet atomization to the fragmentation of the bubble. The results reveal that the average bubble diameter decreases as the exited frequency increases. And nonlinearity of capillary wave seems to make the average diameter of the bubbles much smaller than that of atomized droplets.
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