کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
201664 | 460564 | 2012 | 12 صفحه PDF | دانلود رایگان |

A new pair-potential energy function of sulfur hexafluoride has been determined via the inversion of reduced viscosity collision integrals at zero pressure and fitted to obtain a Hartree–Fock dispersion (HFD)-like potential form. The pair-potential reproduces the second virial coefficient and transport properties of sulfur hexafluoride in a good accordance with experimental data over wide ranges of temperatures. Molecular dynamics (MD) simulation has been also performed to obtain pressure, self-diffusion coefficient, and radial distribution function of fluid sulfur hexafluoride at different temperatures and densities using the calculated HFD-like pair-potential. We have also obtained pressures of SF6–Ar and SF6–Kr fluid mixtures at constant temperature at different densities using new two-body HFD-like models. To take higher-body forces into account, three-body potentials of Wang and Sadus (2006) [22] and [23] and Hauschild and Prausnitz (1993) [24] have been used with the two-body HFD-like potentials of SF6, SF6–Ar, and SF6–Kr systems to improve the prediction of the calculated properties without requiring an expensive three-body calculation. The MD simulation of sulfur hexafluoride has been also used to determine a new equation of state.
► A new pair-potential of SF6 obtained via the inversion method at zero pressure.
► The potential reproduces transport properties in a good accordance with experiment.
► MD simulation performed to obtain some properties of SF6, SF6–Ar, and SF6–Kr systems.
► Two simple three-body potentials also used to improve the prediction of the results.
► The MD simulation also used to determine a new EOS for fluid SF6.
Journal: Fluid Phase Equilibria - Volume 333, 15 November 2012, Pages 1–12