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首页> 外文期刊>International Journal of Thermophysics >Viscosities of Liquid Refrigerants from a Rough Hard-Sphere Theory-Based Semi-Empirical Model
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Viscosities of Liquid Refrigerants from a Rough Hard-Sphere Theory-Based Semi-Empirical Model

机译：基于粗糙的硬球理论的半实证模型的液体制冷剂粘度

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摘要

In this study, the application of a semi-empirical model for the prediction of dynamic viscosities of liquid refrigerants has been explored for both saturated and compressed states. The model used rough hard-sphere (RHS) theory in the model development; a smooth hard-sphere expression and a coupling parameter of translational-rotational motions were employed. Also, the model used the three inputs, the critical temperature, critical density, as well as the liquid densities, for which the values were taken from Carnahan-Starling-vdW-beta equation of state (EoS). Most of the refrigerants investigated herein are those based on methane, ethane, and propane. The ability of the RHS-based model been checked by the calculation of dynamic viscosities of 26 liquid refrigerants at compressed states in the 200 K to 420 K range and pressures up to 50 MPa. The average absolute deviation of 4.47% (for 1539 data points) and 5.22% (for 121 data points), respectively, were obtained for the cases of compressed and saturated liquid refrigerants studied. The degree of accuracy of the present semi-empirical model has also been compared with the literature RHS-based models as well as other approach based on the viscosity EoS.
机译：在该研究中，已经探讨了饱和和压缩状态的施加用于预测液体制冷剂动态粘度的半实验模型。模型在模型开发中使用了粗糙的硬球（RHS）理论;采用平滑的硬球形表达和翻译旋转运动的耦合参数。此外，该模型使用了三个输入，临界温度，临界密度以及液密，从而从肠球 - 塔林 - VDW-β方程（EOS）中取出的值。本文研究的大多数制冷剂是基于甲烷，乙烷和丙烷的制冷剂。通过在200K至420k的压缩状态下计算RHS的基于RHS的模型的能力通过在200k至420k的压缩状态下计算，高达50MPa的压力。对于压缩和饱和液体制冷剂的情况，可以分别获得4.47％（1539个数据点）和5.22％（对于121个数据点）的平均绝对偏差。本半经验模型的准确度也与基于文献RHS的模型以及基于粘度EOS的其他方法进行了比较。

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