Quantitative identification of unique thermo-fluid dynamic states and experimental verification of transitions among the states in superfluid helium

利用PIV技术对超流氦的热逆流射流进行了实验研究，并利用可视化技术和PIV技术对超流氦的沸腾现象进行了实验研究。在前者中，确认了量子化涡旋效应（超流破裂）的出现以及量子化涡旋效应分别与热通量和热通量平方成正比的状态的存在，并理解了物理状态。在沸腾实验中，定量地确定了膜沸腾的起始条件、噪声膜沸腾和无声膜沸腾的出现条件。

Experiments of superfluid helium were conducted on the thermal counterflow jet using PIV method and the boiling phenomena *by visualization method and by using PIV method. In the former, the appearance of the effect of quantized vortices (superfluid breakdown) and the existence of states where the effect of quantized vortices is in proportion to the heat flux and the square of the heat flux respectively were confirmed, and the physical states have been understood. In boiling experiments, the onset conditions of film boiling, the appearance conditions of both noisy and silent film boiling states were quantitatively identified.