Measurements of the density and viscosity of the tridecane + 2,2,4,4,6,8,8-heptamethylnonane mixtures in the temperature range 293.15 - 353.15 K at pressures up to 100 MPa

The dynamic viscosity, η, of the binary mixture 2,2,4,4,6,8,8-heptamethylnonane + tridecane was measured in the temperature range 293.15-353.15 K (in progressive steps of 10 K) at pressures 0.1, 20, 40, 60, 80, and 100 MPa. The system is described by nine molar fractions (0 to 1 in progressive steps of 0.125). The density, p, has been measured at pressures from 0.1 to 65 MPa in progressive steps of 5 MPa. The whole set of experimental data represents 378 points for the dynamic viscosity (84 for the pure compounds and 294 for the mixtures) and 882 for density. The measurements of η allow the determination of the excess viscosity, η E , and the excess activation energy of flow, ΔG B , versus pressure, temperature, and composition. Some models have been used in order to represent the viscosity of this binary mixture.