LAUSR

Abstract A vibrating-wire viscometer has been developed to measure the viscosity of compressed liquid. The experimental apparatus was calibrated by the compressed liquid propane along isotherms from (213.150 to 273.150) K and pressures up to 13 MPa. The experimental data were compared with the values calculated by a correlation proposed by Vogel et al., good agreement is found with an average absolute relative deviation (AARD) of 0.48%. The standard measurement uncertainties were estimated to be 7.7 mK for temperature and 0.0021 MPa for pressure, and the combined relative expanded uncertainty of viscosity measurement was calculated to be 2.9% (k = 2). Moreover, the experimental viscosity data of compressed liquid carbon dioxide were obtained in the temperatures from (218.150 to 273.150) K and pressures up to 13 MPa. The experimental data were compared with the values calculated by a correlation proposed by Fenghour et al., and the deviations between this work and the correlation vary from −2.1% to 1.8% and the AARD is 1.1%. The experimental results were represented by a hard-sphere model with an AARD of 0.74%.