The viscosity of hydrogen mixtures in the supercritical region of water is significant for the optimization of the gasification process of organic substances in supercritical water. In this work, a capillary apparatus was developed for measuring the viscosity of fluids and their mixtures at 279–980 K and up to 34 MPa. The viscosities of pure water, nitrogen, and hydrogen at 279–980 K and 0.5–31.0 MPa were measured, and the results were compared with the reference equations. Then, the viscosities of the H₂–CO₂ and H₂–CO₂–CH₄ mixtures at 280–677 K and 0.7–33.1 MPa and of the H₂–H₂O mixtures and the H₂–CO₂–CH₄–CO–H₂O system at 720–924 K and 19.9–31.1 MPa were measured. The expanded relative uncertainty (k = 2) for the dynamic viscosity was estimated as 0.05. The viscosity data of the hydrogen mixtures were compared with those predicted using the equation of Wilke considering the nonideal gas effect. The absolute relative deviations between the calculated and experimental dynamic viscosities are less than 4.87%.

中文翻译：

---

H ₂ –CO ₂，H ₂ –CO ₂ –CH ₄和H ₂ –H ₂ O混合物以及H ₂ –CO ₂ –CH ₄ –CO–H ₂ O系统在280–924 K和使用毛细管装置时0.7–33.1 MPa

氢混合物在水的超临界区域中的粘度对于优化超临界水中有机物的气化过程非常重要。在这项工作中，开发了一种毛细管仪器，用于测量流体及其混合物在279–980 K和最高34 MPa时的粘度。测量了纯水，氮气和氢气在279–980 K和0.5–31.0 MPa下的粘度，并将结果与​​参考方程式进行了比较。然后，H ₂ –CO ₂和H ₂ –CO ₂ –CH ₄混合物的粘度在280–677 K和0.7–33.1 MPa下以及H ₂ –H ₂ O混合物和H ₂ –CO ₂ –CH的粘度在720–924 K和19.9–31.1 MPa下测量了₄ –CO–H ₂ O系统。动态粘度的扩展相对不确定度（k = 2）估计为0.05。考虑到非理想气体效应，将氢混合物的粘度数据与使用Wilke公式预测的数据进行了比较。计算的和实验的动态粘度之间的绝对相对偏差小于4.87％。