2000 Fiscal Year Final Research Report Summary
Movement of Foreign Particles in Liquid Driven by Interfacial Tension Gradient under Microgravity
| Project/Area Number |
11450286
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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 |
Metal making engineering
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| Research Institution | KYUSHU INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
MUKAI Kusuhiro Faculty of Engineering, KYUSHU INSTITUTE OF TECHNOLOGY, Professor, 工学部, 教授 (60023173)
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| Co-Investigator(Kenkyū-buntansha) |
WASAI Kyoko Faculty of Engineering, KYUSHU INSTITUTE OF TECHNOLOGY, Research Assistant, 工学部, 助手 (90128124)
TAKASU Tomio Faculty of Engineering, KYUSHU INSTITUTE OF TECHNOLOGY, Lecturer, 工学部, 講師 (20264129)
SHINOZAKI Nobuya Faculty of Engineering, KYUSHU INSTITUTE OF TECHNOLOGY, Associate Professor, 工学部, 助教授 (00136524)
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| Project Period (FY) |
1999 – 2000
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| Keywords | Interfacial tension gradient / Movement of foreign particle / Particle in liquid / Microgravity / Drop experiment / Flight experiment |
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| Research Abstract |
The behaviors of fine foreign particles in liquids (distilled water and silicone oil) with a vertical temperature were investigated under 1g and microgravity (10^<-5>g). In a drop experiment using a drop shaft of MGLAB in Toki city, water particles, which had kept falling down in silicone oil under 1g, came to a standstill as microgravity was reached when no temperature gradient existed in silicone oil. In contrast, water particles were found to move up after a very short stop as microgravity was reached when a positive temperature gradient was built up in silicone oil. The upwards velocity of the water particle show a tendency to increase with increasing radius of the particle and temperature gradient in the silicone oil.
Analysis based on the previous study by our research group indicated that around the interface between particle and liquid, temperature gradient could result in interfacial tension gradient that propels particle in the direction of decreasing interfacial tension. The Dependencies of the particle velocity on the radius of the particle and the temperature gradient are also explained qualitatively based on the analysis using our previous study. In addition, this research also indicates that a much longer period of microgravity is needed in order to clarify more clearly the effect of interfacial tension gradient on the behavior of foreign particles in liquid. A parabolic flight experiment has much more feasibility for clarifying accurately the behavior of foreign particles in liquid for various kinds of systems.
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