Contribution to the modeling of the shear viscosity of sulfur hexafluoride (SF6): Comparative study of some representative models

摘要: Three recent physically based models (Lennard-Jones, free volume, thermodynamic scaling) for representing the viscosity of sulfur hexafluoride (SF6) are discussed together with two (friction theory and Enskog 2r) that have been recently applied to this fluid. The experimental database employed adjustment (1562 data points) considers a large temperature (225.18 473.15 K) pressure intervals (0.0264 51.21 MPa). absolute average deviation is 3.8% Lennard-Jones model (one parameter), 1.7% volume (three parameters) 1.5% scaling (six parameters). Thus, it shown when approaches employed, limited number parameters sufficient represent accurately shear SF6. Furthermore has confirmed, using approach, repulsive steepness SF6 interaction potential higher than usually found fluids composed by non polar spherical molecule.