High-precision viscosity measurements on methane
Eckhard Vogel, Jörg Wilhelm, Cornelia Küchenmeister, Manfred Jaeschke
A new vibrating-wire viscometer of very high precision was applied to determine the viscosity coefficient of methane. The relative measurements are characterised by a reproducibility of less than ±0.1% and by an accuracy of ±0.3%. The experiments were carried out at nominal temperatures of 260, 280, 300, and 320 K and at pressures up to 20 MPa as well as at temperatures of 340 K and 360 K and at pressures up to 29 MPa. The density dependence of the viscosity can appropriately be represented for all isotherms by a power series expansion restricted to the fourth power.