量子流体低温下表面张力数据的关联与计算

CORRELATION AND CALCULATION OF THE SURFACE TENSION DATA OF QUANTUM FLUIDS AT LOW TEMPERATURES

本文基于表面热力学理论和对比态原理，建立了一个量子流体表面张力的普遍化方程。这是一个含有两个与温度无关的半理论方程，通过四种纯量子流体低温下表面张力数据的关联与计算，所得结果与实验数据符合良好。本方法可供工程计算使用，其优点是使用简便，计算时只需少数已知参数（ｐｃ，Ｔｃ，Ｚｃ）即可。

On the basis of the theory of surface- thermodynamics and the theorem of corresponding states a general equation of surface tensions is derived by using thermodynamic analytical method. This is a semitheoretical equation with two temperature- independear parameters, relating surface tensions of liquids with temperature. In this paper the surface tension data of four pure quantum fluids are correlated by the above correlation, and then calculated in the temperature range from 1.5 to 30 K. The obtained results are good agreement with experimental data. The proposed estimating method may be used for engineering calculations. The advatage of this method is simple and convenient in use, it requires only a few known parameters, as critical pressure (pc), temperature (Tc) and compressibility factor (Zc) for calculations.