HeII的粘度理论分析与计算

Theoretical analysis and calculation of the viscosity of HeI and HeII

在一般的分析与计算中,超流氦的粘度往往成为一个被忽视甚至被省略的一个物理量。但是在某些低温系统中,需要完成超流氦长距离输送,粘度成为确定其流动阻力损失的一个重要物理量。目前各具特色的理论和计算关系式很多,但是迄今为止,还没有任何一种理论体系或计算关系式可以适用于所有的物质或所有的温度和压力范围,因此如何应用和借鉴现有的粘度理论或关系式以及实验结果,实现对HeII这种特殊流体粘度的分析和计算是一项十分重要的工作。

The viscosity of liquid HeII is nearly zero, so the liquid HeII is also called superfluid helium. Because of its special physical characteristics, the viscosity of superfluid helium is always ignored or omitted. But the viscosity became very important in determination of the resistance drag of the long transfer system inthe cryogenic systems. There are many theory systems and calculation equations, but none of them could be fit for all the matters or all the temperature and pressure ranges. So how to use the theories and equations already exist to calculate the viscosity of the superfluid helium, the very special liquid, is very important.