A unified equation of state for fluids of C-H-O-N-S-Ar composition and their mixtures up to very high temperatures and pressures

Physics – Fluid Dynamics

Scientific paper

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Computerized Simulation, Equations Of State, Fluid Dynamics, Intermolecular Forces, Planetary Mantles, Ammonia, Argon, Carbon Dioxide, Carbon Monoxide, Carbonyl Compounds, Hydrogen, Hydrogen Sulfide, Methane, Nitrogen, Oxygen, Sulfur, Sulfur Dioxides, Water

Scientific paper

A unified equation of state (EOS) is derived for 13 gases (including H2O, CO2, CH4, CO, O2, H2, Ar, N2, NH3, H2S, SO2, COS, and S2) in C-H-O-N-S-Ar system, on the basis of molecular dynamical simulated PVT data, assuming these species to be alpha-exponential-6 fluids at high temperature and pressure. The EOS equation is parameterized for these gases in the ranges of temperature and pressure 400-4000 K and 5-1000 kbar, respectively. It is shown that the equation reproduces most of the available experimental data in the limits of experimental accuracy of volume measurements.

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