| Project/Area Number |
10555056
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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 | 展開研究 |
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| Research Field |
Fluid engineering
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| Research Institution | THE UNIVERSITY OF TOKYO |
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Principal Investigator |
60111473 DEPT. OF MECH. ENG., THE UNIVERSITY OF TOKYO, PROFESSOR, 大学院・工学系研究科, 教授 (60111473)
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| Co-Investigator(Kenkyū-buntansha) |
AOKI Isao DEPT. OF MECH. ENG., THE UNIVERSITY OF TOKYO, RESEARCH ASSOCIATE, 大学院・工学系研究科, 助手 (30175723)
MARUYAMA Shigeo DEPT. OF MECH. ENG., THE UNIVERSITY OF TOKYO, ASSOCIATE PROFESSOR, 工学部・附属総合試験所, 助教授 (90209700)
MATSUI Hiroyuki DEPT. OF MECH. ENG., THE UNIVERSITY OF TOKYO PROFESSOR, 大学院・工学系研究科, 教授 (00026098)
TAKAGI Shu DEPT, OF MECH. ENG., THE UNIVERSITY OF TOKYO, ASSISTANT PROFESSOR, 大学院・工学系研究科, 講師 (30272371)
ICHIKAWA Yasumasa DEPT. OF MECH. ENG., THE UNIVERSITY OF TOKYO, RESEARCH ASSOCIATE, 大学院・工学系研究科, 助手 (40134473)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥13,300,000 (Direct Cost: ¥13,300,000)
Fiscal Year 1999: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1998: ¥10,800,000 (Direct Cost: ¥10,800,000)
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| Keywords | High Quality Molecular Beam / Supersonic Free Jet / Rarefied Gas Flow / Solid Interface / Active Control / Molecular Dynamics Simulation / Internal Degree of Freedom / Laser |
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| Research Abstract |
The following topics were mainly emphasized for the development of a high quality molecular beam and the active control of interfacial physical chemical phenomena.
(1) Analysis of the supersonic free jet
A flat plate was inserted into the supersonic free jet and numerical simulations and vacuum experiments were carried out to understand the interfacial physical chemical phenomena at the plate-gas boundary. First, using our rarefied gas now numerical predictor, the rotational state of the gas molecules inside the free jet was estimated. Next, vacuum experiments using the electron beam fluorescence (EBF) technique was performed by changing the plate's relative position, initial gas pressure, initial gas temperature. Experiments were done to investigate the rotational effect on the interfacial phenomena.
(2) Design and development of a high quality molecular beam
Based on the knowledge obtained from (1), flow velocity, translational temperature and rotational temperature of a molecular beam using a skimmer, collimator, and an aperture was estimated. Thus, the molecular beam was optimized by changing the skimmer diameter, shape and material. Also, the nozzle was combined with a one-dimensional traverse unit to extract an optional region of the free jet. Furthermore, the vacuum system and mass filter were revised, and a pulsed nozzle was adopted. Such change has given us high quality data. The test gas molecules were Ar and He, the test surfaces were graphite and copper, to obtain data on the relation between molecular size and it's three-dimensional scattering data.
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