| Project/Area Number |
26289031
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
WATANABE MASAO 北海道大学, 工学(系)研究科(研究院), 教授 (30274484)
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| Co-Investigator(Kenkyū-buntansha) |
真田 俊之 静岡大学, 工学部, 准教授 (50403978)
小林 一道 北海道大学, 工学(系)研究科(研究院), 准教授 (80453140)
矢口 久雄 群馬工業高等専門学校, その他部局等, 講師 (20568521)
藤井 宏之 北海道大学, 工学(系)研究科(研究院), 助教 (00632580)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2015: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2014: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000)
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| Keywords | 流体 / 混相流 / 液滴 / 液滴衝突 / スプラッシュ / 薄膜流れ / 可視化 / 熱工学 / マイクロ・ナノデバイス / 流体力学 |
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| Outline of Final Research Achievements |
Droplet impacts on solid surface are key elements in technical applications, such as rapid spray cooling, ink-jet printing and semiconductor cleaning. Although the broad varieties of parameters that control splash formation after the droplet impact, are proposed, they are not thoroughly explored; hence, dynamics of the droplet after the impact are yet fully understood. After droplet impacts on solid surface, characteristic film flow is developed; then splash may be generated. In this study, we examine the effects of the temperature of surrounding gas, which is either condensable or non-condensable, on ethanol droplet impact. We found that splash can be suppressed with the increase of the surrounding gas temperature. We measured the splash threshold pressure for a splash to appear as a function of the temperature. The results show that the splash threshold pressure is a monotonically increasing function of the surrounding gas temperature.
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