高温高压下液态水声速的研究——不同状态方程的准确性验证

 研究水的热力学状态方程，对于理解地球及行星科学等起着重要作用，但由于高温高压区域的实验数据较少，该区域的状态方程主要依赖于由低压部分外延或分子动力学模拟计算得到。采用布里渊散射技术测量熔解曲线附近液态水的声速，低温区采用电加热系统，高温区采用激光加热布里渊散射系统，分析比较了由实验测量得到的声速值与用经验状态方程计算的结果之间的差别。结果表明，在温度不超过673 K、压力不超过6.0 GPa的范围内，Abramson方程的计算结果与实验测量结果在误差范围内一致，而Saul 和IAPWS-95的预言值比实验测量值偏高，并且温度越高偏差越大。在压力为21 GPa、温度为890~1 100 K时，实验测量出的水的声速比状态方程预言的结果偏高。

Acoustic Velocity of Water under High Temperature and High Pressure:Validity of the Equation of State of Water

The knowledge of the thermodynamic equation of state of fluid water plays an important role in understanding of many phenomena within the purview of the earth and planetary sciences.However,data are sparse in the high temperature and high pressure region and most equations of state for water,at high pressures,rely heavily on extrapolation of data or calculations of molecular dynamics.This paper presents the acoustic velocity of water measured by Brillouin scattering technique at different temperature and pr...