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维里系数是再现非理想流体热物性必不可少的基本参数。该文改进了Weber对比态型第三维里系数经验预估式,使其与第二维里系数相关联。由于第二和第三维里系数之间的关联性,可以适当改善预估偏差;并且减少了输入参数,与第二维里系数预估式的输入参数相同,仅仅需要临界温度、临界压力、偏心因子和对比偶极;同时改善了对非极性和极性流体的再现情况,预估结果与最新高精度的实验数据和常用预估式的预估结果符合得很好。得到的截断维里方程可以用来很好地再现纯净流体的pVT热力学性质。
The virial coefficient is an indispensable basic parameter for reproducing the thermophysical properties of non-ideal fluids. In this paper, we improve Weber’s empirical prediction of the third-dimensional Coefficient of the state of contrast and associate it with the second-dimensional Coefficient. Due to the correlation between the second and third virial coefficients, the estimated bias can be properly improved; and the input parameters are reduced, which is the same as the input parameters of the second virial coefficient estimate, only the critical temperature, the critical pressure, the eccentricity Factor and contrast dipole. At the same time, the reconstruction of non-polar and polar fluids is improved. The prediction results are in good agreement with the latest high-precision experimental data and the prediction of commonly used predictions. The truncated Virial equation can be used to reproduce the pVT thermodynamic properties of pure fluid well.