Krytox GPL102 Oil as Reference Fluid for High Viscosities: High Pressure Volumetric Properties, Heat Capacities, and Thermal Conductivities

In this paper the results of volumetric, isobaric heat capacity, and thermal conductivity measurements in the liquid region of a round-robin sample of Krytox GPL102 oil are reported. The measurements presented here are part of a worldwide program for the determination of transport properties of this perfluoropolyether oil. Density was measured from (278.15 to 398.15) K up to 120 MPa, whereas isobaric heat capacity and thermal conductivity measurements were performed at atmospheric pressure from (278.00 to 398.14) K and (278.77 to 323.29) K, respectively. The measured properties are represented within 0.0003 g·cm–3, 0.005 J·g–1·K–1, and 2 mW·m–1·K–1 by using different correlation equations. The provided Tammann–Tait equation of state with seven parameters was used to determine isobaric thermal expansivities, bulk modulus, and isothermal compressibilities. Finally, the temperature dependence of the thermal diffusivities was also analyzed.