| Budget Amount *help |
¥44,070,000 (Direct Cost: ¥33,900,000、Indirect Cost: ¥10,170,000)
Fiscal Year 2022: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
Fiscal Year 2021: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000)
Fiscal Year 2020: ¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2019: ¥12,480,000 (Direct Cost: ¥9,600,000、Indirect Cost: ¥2,880,000)
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| Outline of Final Research Achievements |
The measurement system of three velocity components of fluid flow in space is realized with four high-speed cameras and CW laser. Small-scale turbulent structures and vortex sheet are captured by the Q-criteria based on velocity gradient tensor. Small particle trajectories in super fluid were analyzed and they are characterized by the local curvatures. It was found that the PDF of curvature is similar with that of classical turbulence. However, it differs between two and three dimensional space. The local curvature can also characterize the interaction of particles with quantum vortex. The separation distance between quantum vortexes can be estimated by the variance of particle position along the trajectories and Hurst exponent. As a new visualization system, it was confirmed that the helium excimer can be used as tracer particles in super fluid which is generated by the discharge in liquid.
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