Entropy Scaling of Viscosity—II: Predictive Scheme for Normal Alkanes†,Journal of Chemical & Engineering Data

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Entropy Scaling of Viscosity—II: Predictive Scheme for Normal Alkanes†
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-10-16 , DOI: 10.1021/acs.jced.0c00749
Ian H Bell ₁

Affiliation

In this work, a residual entropy value of 6/10 of the way between the critical point and a value of −2/3 of Boltzmann constant is shown to collapse the scaled viscosity for the family of normal alkanes. Based on this approach, a nearly universal correlation is proposed that can reproduce 95% of the experimental data for normal alkanes within ±18% (without removal of clearly erroneous data). This universal correlation has no new fluid-specific empirical parameters and is based on experimentally accessible values. This collapse is shown to be valid to a residual entropy half-way between the critical point and the triple point, beyond which the macroscopically scaled viscosity has a superexponential dependence on residual entropy, terminating at the triple point. A key outcome of this study is a better understanding of entropy scaling for fluids with intramolecular degrees of freedom. A study of the transport and thermodynamic properties at the triple point rounds out the analysis.

中文翻译：

粘度的熵标度—II：正烷烃的预测方案†

在这项工作中，临界点和玻尔兹曼常数 -2/3 之间的剩余熵值 6/10 表明正构烷烃家族的缩放粘度会崩溃。基于这种方法，提出了一种几乎通用的相关性，可以在±18%范围内再现95%的正烷烃实验数据（不去除明显错误的数据）。这种通用相关性没有新的特定于流体的经验参数，并且基于实验可获得的值。这种崩溃被证明对于临界点和三相点之间的残余熵是有效的，超过该值，宏观尺度的粘度对残余熵具有超指数依赖性，终止于三相点。这项研究的一个关键成果是更好地理解具有分子内自由度的流体的熵标度。对三相点处的输运和热力学性质的研究完善了分析。

更新日期：2020-11-12

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