Viscosity of the n‐Decane—Methane System in the Liquid Phase

The viscosity of liquid n‐decane and liquid mixtures of n‐decane—methane containing 31.2, 55.7, 69 and 84.7 mol% methane has been measured using an absolute oscillation vessel viscometer. The measurements have been performed in the temperature range 20–150°C, and at pressures up to 40 MPa.—The viscosities of the n‐decane and the liquid mixtures are described separately by an empirical correlation in terms of temperature and pressure. The standard deviation in fit are 0.14–0.2%. The estimated accuracy is ± 1% for n‐decane at 20°C deteriorating to ±4% at 150°C for the mixtures containing 84.7 mol% methane.—Applying a generalization of the Grundberg and Nissan equation, the experimental viscosities are expressed as a function of temperature, pressure and composition with an overall standard deviation in the fit of 0.6%.—Literature data deviate 0‐ +4% from the correlated n‐decane viscosities, and +10 to +40% from the mixture viscosities of the present investigation.