Numerical study of cavitating flow characteristics of liquid helium in a pipe
Numerical study of cavitating flow characteristics of liquid helium in a pipe
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DOI：
10.1016/s0017-9310(03)00386-7
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发表时间：
2004
影响因子：
5.2
通讯作者：
J. Ishimoto;K. Kamijo
中科院分区：
文献类型：
--
作者：
J. Ishimoto;K. Kamijo
为了实现新型低温超流冷却系统的进一步开发和高性能化，对垂直管道中λ点附近液氦二维空泡流动的基本特征进行了数值研究。结果表明，在汽蚀时液-气相变活跃的大气相体积分数区，由于热力学效应，正常流体向超流体的相变以及超流体逆正常流体流动的逆流现象十分明显。此外，它是澄清的机制，He I到He II相变所造成的温度下降是由于剥夺潜热蒸发从液相。
The fundamental characteristics of the two-dimensional cavitating flow of liquid helium in a vertical pipe near the lambda point are numerically investigated to realize the further development and high performance of new cryogenic superfluid cooling systems. It is found that the phase transition of the normal fluid to the superfluid and the generation of superfluid counterflow against normal fluid flow based on the thermomechanical effect is conspicuous in the large gas phase volume fraction region where the liquid to gas phase change with cavitation actively occurs. Furthermore, it is clarified that the mechanism of the He I to He II phase transition caused by the temperature decrease is due to the deprivation of latent heat for vaporization from the liquid phase.