Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

In this work, kinematic viscosities of benzene, n-tetradecane, and of the mixture benzene + n-tetradecane at four different compositions were measured using a rolling-ball viscometer from 313.2 to 393.2K and pressures up to 60MPa. Kinematic viscosities were converted to dynamic viscosities through the use of a density Tait-like equation for pure components and a single density mixing rule for the mixtures. A comparison between our measured viscosities and those reported by other authors for benzene and n-tetradecane was established with the correlation given by Assael et al. [M.J. Assael, J.H. Dymond, M. Papadaki, P.M. Patterson, Correlation and prediction of dense fluid transport coefficients. I. n-alkanes, Int. J. Thermophys. 13 (1992) 269 281]. The comparison showed an average absolute deviation of 1.5% for benzene and 2.7% for n-tetradecane. The measured mixture viscosity data were modeled with a proposed liquid viscosity model based on the Eyring s theory coupled with a cubic equation of state and using a single temperature-independent binary interaction parameter to describe the whole c.T.p.x surface of study. Results of the modeling effort yielded an average absolute deviation of 2.0%, which is within the experimental uncertainty.