液态氦冲击压缩性理论计算

Theoretical Calculation for the Hugoniot Curves of Liquid Helium

1.
Laboratory for Shock Wave and Detonation Physics Research, Southwest Institute of Fluid Physics, Chengdu 610003, China;
2.
Institute of Applied Physics, Sichuan Union University, Chengdu 610065, China

摘要: 采用孤立氦原子两体排斥势和微扰变分液体理论计算了液态氦一次和二次冲击压缩曲线。与文献[4]实验结果比较发现，在相同体积下，理论计算压力偏高30%~50%，表明高温高密度状态下，氦原子间的等效排斥势比孤立氦原子两体排斥势低很多。文中分析讨论了引起液态氦在高压下异常软化现象的可能机制和理论处理方法。
- 液氦 /
- 冲击压缩性 /
- 排斥势
Abstract: The variational fluid perturbation theory is used to calculate the single and double shock Hugoniot curves of liquid helium by means of a two-body potential function. It is found that the theoretical predictions are 30%～50% higher than the measurements at the same volume. It shows that the effective potential of two atoms, which are at high densities and temperatures, is much lower than that of two isolated ones. The physical mechanism which probably causes this unusual soften phenomena and its theoretical treatment methods are discussed as well.
- liquid helium /
- shock compression /
- repulsive potential