Measurement of Hydrogen Gas Viscosity with Capillary Tube Method at High Pressure and High Temperature - Challenge of high accuracy measurement for differential pressure transducer

摘要

A capillary viscometer has been developed for measurement of dynamic viscosity of gases for high pressure and high temperature. The apparatus is designed for safe-handling and is located in a remote area. The gas was supplied to the capillary tube from a pressure reservoir tank through a pressure regulator unit to maintain a steady state flow. A pair of absolute pressure transducers was used as a pressure differential sensor to measure a pressure drop. The pressure drop along the capillary tube was calculated by subtracting the outlet pressure (P_(out)) from the inlet (P_(in)). The present study shows that viscosities of hydrogen can be measured for temperature ranges from 295 to 400 K and for pressures up to 100 MPa with a maximum deviation up to 2% compared with the existing correlations.