An update of the reference correlation for the viscosity of ethane [E. Vogel et al., J. Phys. Chem. Ref. Data 44, 043101 (2015)] was developed because recently a new zero-density viscosity correlation based on theoretically calculated values of the dilute-gas viscosity became available. The original zero-density contribution was replaced, and the generation of the complete viscosity correlation was repeated using the residual viscosity concept and a state-of-the-art linear optimization algorithm. A term representing the critical enhancement was again included, so that a total of 18 coefficients resulted for the final formulation. The viscosity in the limit of zero density is now described with an expanded uncertainty of 0.3% (coverage factor k = 2) in the temperature range 250 ≤ T/K ≤ 700 and of 1.0% at temperatures 90 ≤ T/K < 250 and 700 < T/K ≤ 1200. The updated complete viscosity correlation is valid in the fluid region from the melting line to 675 K and 100 MPa. The uncertainty of the correlation amounts to 1.5% at temperatures 290 ≤ T/K ≤ 430 and at pressures up to 30 MPa based on very reliable data. The uncertainty of the correlated values is increased to 4.0% in the range 95 ≤ T/K ≤ 500 at pressures up to 55 MPa, for which further primary data exist. In the region where no experimental data are available, but the reference equation of state of Bucker and Wagner is valid, the uncertainty is estimated to be 6.0%. The uncertainty in the near-critical region rises with decreasing temperature up to 3.0% when taking into account the available data.An update of the reference correlation for the viscosity of ethane [E. Vogel et al., J. Phys. Chem. Ref. Data 44, 043101 (2015)] was developed because recently a new zero-density viscosity correlation based on theoretically calculated values of the dilute-gas viscosity became available. The original zero-density contribution was replaced, and the generation of the complete viscosity correlation was repeated using the residual viscosity concept and a state-of-the-art linear optimization algorithm. A term representing the critical enhancement was again included, so that a total of 18 coefficients resulted for the final formulation. The viscosity in the limit of zero density is now described with an expanded uncertainty of 0.3% (coverage factor k = 2) in the temperature range 250 ≤ T/K ≤ 700 and of 1.0% at temperatures 90 ≤ T/K < 250 and 700 < T/K ≤ 1200. The updated complete viscosity correlation is valid in the fluid region from the melting line to 675 K and 100 MPa. The uncertainty of the correlation amou...

中文翻译：

---

更新：乙烷粘度的参考相关性 [J. 物理。化学 参考 数据 44, 043101 (2015)]

乙烷粘度参考相关性的更新 [E. Vogel 等人，J. Phys. 化学 参考 数据 44, 043101 (2015)] 的开发是因为最近可以使用基于稀释气体粘度理论计算值的新零密度粘度相关性。原来的零密度贡献被替换，并使用残余粘度概念和最先进的线性优化算法重复生成完整的粘度相关性。再次包含代表临界增强的项，因此最终配方总共产生 18 个系数。现在描述零密度极限下的粘度在 250 ≤ T/K ≤ 700 温度范围内为 0.3%（覆盖系数 k = 2），在 90 ≤ T/K < 250 温度范围内为 1.0% 和700 < T/K ≤ 1200。更新的完整粘度相关性在从熔化线到 675 K 和 100 MPa 的流体区域中有效。根据非常可靠的数据，在温度 290 ≤ T/K ≤ 430 和压力高达 30 MPa 时，相关性的不确定性为 1.5%。在 95 ≤ T/K ≤ 500 的压力范围内，相关值的不确定性增加到 4.0%，压力高达 55 MPa，对此存在进一步的原始数据。在没有实验数据但Bucker 和Wagner 状态参考方程有效的区域，估计不确定度为6.0%。考虑到可用数据，近临界区域的不确定性随着温度的降低而升高，最高可达 3.0%。乙烷粘度参考相关性的更新 [E. Vogel 等人，J. Phys. 化学 参考 数据 44, 043101 (2015)] 的开发是因为最近可以使用基于稀气体粘度理论计算值的新的零密度粘度相关性。原来的零密度贡献被替换，并使用残余粘度概念和最先进的线性优化算法重复生成完整的粘度相关性。再次包含代表临界增强的项，因此最终配方总共产生 18 个系数。现在描述零密度极限下的粘度在 250 ≤ T/K ≤ 700 温度范围内为 0.3%（覆盖系数 k = 2），在 90 ≤ T/K < 250 温度范围内为 1.0% 和700 < T/K ≤ 1200。更新的完整粘度相关性在从熔化线到 675 K 和 100 MPa 的流体区域中有效。相关性的不确定性...