Bulk viscosity of gaseous argon from molecular dynamics simulations

L Alboul and SV Lishchuk, PHYSICAL REVIEW E, 105, 054135 (2022).

DOI: 10.1103/PhysRevE.105.054135

The bulk viscosity of dilute argon gas is calculated using molecular dynamics simulations in the temperature range 150-500 K and is found to be proportional to density squared in the investigated range of densities 0.001-1 kg m(-3). A comparison of the results obtained using Lennard-Jones and Tang-Toennies models of pair interaction potential reveals that the value of the bulk viscosity coefficient is sensitive to the choice of the pair interaction model. The inclusion of the Axilrod- Teller-Muto three-body interaction in the model does not noticeably affect the values of the bulk viscosity in dilute states, contrary to the previously investigated case of dense fluids.

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