《Operation of a vibrating wire viscometer at viscosities》.pdf

774 J. Chem. Eng. Data 2007, 52, 774782 Operation of a Vibrating Wire Viscometer at Viscosities Greater than 0.2 Pas: Results for a Certified Reference Fluid with Nominal Viscosity at T 273 K and p 0.1 MPa of 0.652 Pas while Stagnant and a Fluid of Nominal Viscosity of 0.037 Pas while Flowing Christopher Harrison* and Matthew Sullivan Schlumberger-Doll Research, 36 Old Quarry Road, Ridgefield, Connecticut 06877 Sophie Godefroy and Noriyuki Matsumoto Schlumberger Kabushiki Kaisha, 2-2-1 Fuchinobe, Sagamihara, Kanagawa 229-0006, Japan Anthony R. H. Goodwin and Kai Hsu Schlumberger Sugar Land Product Center, 125 Industrial Boulevard, Sugar Land, Texas 77478 A vibrating wire viscometer formed from a tungsten wire with radius of about 0.125 mm has been used to measure the viscosity of certified reference fluid S60 at temperatures between (273 and 373) K at a pressure of 0.1 MPa where the viscosity varies from (0.0062 to 0.652) Pa s and the resonance quality factor Q lie between (20.8 and 1.02). Our results differ from the values cited by the supplier by less than 3 % over the whole range of Q, T, and p . We have also measured the viscosity of certified reference fluid S20, with (293 K, 0.1 MPa) 37 mPas, while stagnant at pressures below 69 MPa and temperature between (298 and 423) K and also while flowing S20 at volumetric rates up to 66 cm3s1. The values obtained in stagnant S20 differed insignificantly from those while flowing and suggest there is no additional systematic error arising from flow in the viscosity obtained from an axially symmetric vibrating wire viscometer. The working equations for a vibrating wire have been used to estimate Q as a function of viscosity up to 1 Pas for wires with radii between (0.05 and 0.3) mm. The calculated Q com