A study of the boiling phenomena with the enhanced heat transfer in superfluid helium under microgravity condition

超流氦(He II)不仅本身具有零粘度、零熵或高导热系数等独特的流体特性，而且在沸腾过程中也具有非常独特的特性。关于He II中的薄膜沸腾已经进行了许多研究，但直到现在还不能说唯一的是被理解的。而是利用高灵敏度传感器和低温温度可视化技术发现的新现象。为了了解氦II沸腾现象的重力效应，用高速摄像机在微重力条件下进行了实验和分析。结果表明，在超流氦中，膜沸腾的热扩散对液体相的贡献大于在正常流体氦中的热扩散对气相的贡献。

Not only itself has unique such as a fluid with zero viscosity and zero entropy or the high thermal conductivity, but also superfluid helium (He II) has a very unique characteristic in the boiling. Many studies were conducted about film boiling in He II, but cannot say until now that the unique was understood all. Rather it is the present conditions that the phenomenon that is new by becoming it the use of high sensitivity sensor and the visualization technology in cryogenic temperature is discovered.In this study, in order to understand he gravity effect of boiling phenomena in He II, the experiments and its analysis were carried out by optical visualization with high-speed video camera under microgravity condition. It was suggested that the contribution of the thermal diffusion by the film boiling to a liquid phase in superfluid helium was larger than the contribution of the thermal diffusion to a gas phase in normal fluid helium.