Viscosity and dew point measurements of {xCH4 + (1 - X)C4H10} for x = 0.9484 with a vibrating-wire viscometer

Clayton Locke, Dan Fang, Paul Stanwix, Thomas Hughes, Gongkui Xiao, Michael Johns, Anthony Goodwin, Ken Marsh, Eric May

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


© 2015 American Chemical Society. The viscosity of {xCH4 + (1 - x)C4H10} with x = 0.9484 has been measured at temperatures and pressures in the range (200 to 423) K and (2 to 30) MPa, respectively, corresponding to densities between (20 and 371) kg·m-3. The measurements were made using a vibrating-wire-viscometer with the wire clamped at both ends and operated in steady-state mode with a combined relative uncertainty of 1 %. The viscometer was also used to investigate the ability of a vibrating-wire instrument to determine the upper and lower dew pressures of the mixture in the retrograde region at (263 and 273) K. The dew pressures were determined by identifying the point along an isothermal pathway at which the slope of the wire's resonance half-width with pressure exhibited a discontinuity. At the upper dew pressures near 10 MPa the results were consistent to within 0.2 MPa of predictions made using the GERG-2008 equation of state (EOS), while at the lower dew pressures near 3 MPa the agreement was within 0.3 MPa. To facilitate future dew-point measurements, where it may be desirable to scan the mixture pressure rapidly, a novel ring-down technique was demonstrated utilizing the steady-state setup configuration, allowing accurate transient measurements without requiring fast data acquisition and providing flexibility for automated measurements.
Original languageEnglish
Pages (from-to)3688-3695
Number of pages8
JournalJournal of Chemical and Engineering Data
Issue number12
Early online date9 Oct 2015
Publication statusPublished - 10 Dec 2015


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