| Project/Area Number |
17K05548
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Osaka City University |
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Principal Investigator |
Tsubota Makoto 大阪市立大学, 大学院理学研究科, 教授 (10197759)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 量子流体力学 / 量子乱流 / 量子渦 / 超流動ヘリウム / 原子気体ボース・アインシュタイン凝縮 / 乱流 / 2流体モデル / 可視化実験 / 低温物性 |
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| Outline of Final Research Achievements |
We study numerically quantum hydrodynamics and quantum turbulence. In superfluid helium, our main result is to reveal the fully coupled dynamics of the two-fluid (superfluid and normal-fluid) model. The superfluid is described by the vortex filament mode and the normal fluid is described by the Navier-Stokes equation, and they interact through the mutual friction. Considering the thermal couterflow, we succeeded in obtaining the anomalous fluctuation of the normal fluid velocity caused by the vortex tangle; the results are qualitatively consistent with the recent visualization experiments. Another important result is observing the energy cascade of turbulence in a Bose-Einstein condensate trapped by a box potential.
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| Academic Significance and Societal Importance of the Research Achievements |
乱流は基礎科学から応用科学まで、広い分野で研究されて来たが、未だ十分な解明には至っていない。超流動ヘリウムや原子気体BECなどの低温の量子凝縮系では、量子渦の出現に象徴されるように、通常の乱流よりも簡単な「乱流の雛形」が提供されると期待されている。本研究で得られた、超流動ヘリウムの２流体モデルにおける乱流、および原子気体BECの乱流で得られた知見は、普通の乱流の理解にも資する。
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