Viscosity Measurements for n-Octane, Ethylcyclohexane, and Their Binary Mixtures from 283 to 363 K at Pressures up to 20 MPa

Viscosity measurements for n-octane, ethylcyclohexane, and their binary mixtures were performed by using a vibrating-wire viscometer at temperatures between 283.15 and 363.15 K and pressures from 0.1 to 20 MPa. The combined expanded uncertainty (k = 2) of the experimental results is better than 0.02. The extended hard-sphere model was used to correlate the experimental results, and the relative deviations between the experimental data and calculated results were mostly within 1%. Moreover, the viscosity models of pure hydrocarbons combined with the mixing rules were applied to predict the viscosities of these binary mixtures. It is found that the deviations of the predicted results and the experimental viscosity data are generally within 4%.