Visualization of quantum vortex in super fluid and study of universality in turbulence based on pressure measurement

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When the liquid helium has its temperature below 2.17K, it becomes a super fluid with no viscosity. Under this condition, we can expect high Reynolds number property in fluid turbulence. In this study, we successfully developed the visualization technique of super fluid and can observe the quantum vortex motions. Also, the small pressure probe is developed to measure accurate pressure fluctuations. This technique is applied to the near-wall region of turbulent boundary layer. Using the invariant assumption of probability density functions, we suggest the correction method of pressure intensity near wall region.