2017 Fiscal Year Final Research Report
Visualization of quantum vortex structures and the energy spectrum in super fluid turbulence
| Project/Area Number |
15H03917
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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 |
Fluid engineering
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
伊藤 高啓 名古屋大学, 工学研究科, 准教授 (00345951)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | 超流動乱流 / 可視化 / 粒子軌道 |
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| Outline of Final Research Achievements |
The visualization system was improved and the small particle motions in the superfluid could be visualized. The particle sizes are order of 1 micro meter. The boundary between particle and background was clearly distinguished and then the Lagrange trajectory of small particle was identified by image processing system. Based on these improvements of experimental procedure, the Lagrange particle trajectories are visualized and their statistical statistics are analyzed. The power-law exponent of velocity structure functions, which is equivalent to Lagrange spectral exponent, was derived. It was found that there are two different slope regions. The small scale is affected by the quantum vortex and large scale shows the uniform motion. The probability density function of Lagrange velocity and acceleration indicates that they are strongly dependent on the particle sizes and the ratio of super fluid density.
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| Free Research Field |
流体工学
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