| Budget Amount *help |
¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2017: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2016: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2015: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
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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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