Viscosity Measurements of the H₂–CO₂, H₂–CO₂–CH₄, and H₂–H₂O Mixtures and the H₂–CO₂–CH₄–CO–H₂O System at 280–924 K and 0.7–33.1 MPa with a Capillary Apparatus

Abstract

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 H 2 − CO 2 and H 2 −CO 2 −CH 4 mixtures at 280−677 K and 0.7−33.1 MPa and of the H 2 −H 2 O mixtures and the H 2 −CO 2 −CH 4 −CO−H 2 O 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%.

PVT Measurements of the H2–CO2–CH4–CO–H2O System at 740–939 K and 18.1–34.7 MPa with an Isochoric Apparatus and the Development of a Virial Equation of State

“…Hydrogen mixtures mainly consisting of H 2 , CO 2 , CH 4 , and CO are produced in the gasification of organic substances in supercritical water. − Their thermophysical properties, including density, − specific heat capacity, thermal conductivity, and viscosity, , have been experimentally and numerically studied. Modeling of the pVT properties at high temperatures is fundamental to develop the thermophysical database of hydrogen mixtures for the relevant research and industry. − …”

Measurements and Predictive Models for the Viscosity of Coal-Based Kerosene at Temperatures up to 673 K and Pressures up to 40 MPa

“…Some high-temperature and high-pressure (HTHP) viscosity measurement methods have been validated, such as vibrating-wire, , rolling ball, dynamic light scattering, and capillary method. , By comparing these methods, the capillary method is found to be used most frequently. Viscosity measurements in HTHP conditions are considerably difficult and few data points are available.…”