Sotiriadou Sofia G, Antoniadis Konstantinos D, Assael Marc J, Huber Marcia L
Laboratory of Thermophysical Properties and Environmental Processes, Chemical Engineering Department, Aristotle University, 54636 Thessaloniki, Greece.
Chemical Engineering Department, University of Western Macedonia, 50100 Kozani, Greece.
Int J Thermophys. 2025;46(9):133. doi: 10.1007/s10765-025-03603-8. Epub 2025 Jul 10.
This paper presents a new wide-ranging reference correlation for the viscosity of argon, incorporating recent ab initio dilute-gas calculations and critically evaluated experimental data. The correlation is designed to be used with a high-accuracy Helmholtz equation of state that extends from the triple point (83.8058 K) to 700 K, and at pressures up to 1000 MPa. The estimated uncertainty of the correlation based on comparisons with the best experimental data indicate that the uncertainty for the gas at pressures from zero to 0.1 MPa for temperatures from 202 K to 394 K is 0.076% (at = 2), the uncertainty of the best experimental data, offering a significant improvement over the current reference equation that has an uncertainty in this region of 0.5%. A zero-density correlation based on ab-initio values is incorporated that is valid over a temperature range between 84 K and 10 000 K and has an uncertainty of 0.12% (at the 95% confidence level). The estimated uncertainty for moderate pressures from 1 MPa to 100 MPa is 1% for temperatures from roughly 195 K to 300 K, rising to 2% at 175 K. For the high-pressure region, the estimated uncertainty of the correlation is about 2% for temperatures between 175 K and 308 K at pressures from 100 MPa to 606 MPa. For temperatures from 308 K to 700 K at pressures to 5.2 GPa, the equation has an estimated uncertainty of 10%. The estimated uncertainty in the liquid phase at pressures up to 34 MPa is 3%. The correlation behaves in a physically reasonable manner over the full range of applicability of the EOS, although uncertainties may be higher in regions where data were not available for full validation.
The online version contains supplementary material available at 10.1007/s10765-025-03603-8.
本文提出了一种新的适用于氩气粘度的广泛参考关联式，纳入了近期的从头算稀薄气体计算结果以及经过严格评估的实验数据。该关联式旨在与高精度的亥姆霍兹状态方程配合使用，该状态方程的适用范围从三相点（83.8058 K）延伸至700 K，压力上限为1000 MPa。基于与最佳实验数据的比较，该关联式的估计不确定度表明，在温度为202 K至394 K、压力从零至0.1 MPa的范围内，气体的不确定度为0.076%（在k = 2时），即最佳实验数据的不确定度，相较于当前在此区域不确定度为0.5%的参考方程有显著改进。纳入了基于从头算值的零密度关联式，其在84 K至10000 K的温度范围内有效，不确定度为0.12%（在95%置信水平下）。对于1 MPa至100 MPa的中等压力，在大约195 K至300 K的温度范围内，估计不确定度为1%，在175 K时升至2%。对于高压区域，在100 MPa至606 MPa的压力下，温度在175 K至308 K之间时，该关联式的估计不确定度约为2%。对于压力高达5.2 GPa、温度在308 K至700 K之间的情况，该方程的估计不确定度为10%。在压力高达34 MPa的液相中，估计不确定度为3%。尽管在无法获取完整验证数据的区域不确定度可能更高，但该关联式在状态方程的整个适用范围内表现出合理的物理行为。
在线版本包含可在10.1007/s10765-025-03603-8获取的补充材料。
