Molecular dynamics simulations of momentum and thermal diffusion properties of near-critical argon along isobars.
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2016
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Three basic diffusion properties of argon – shear viscosity, bulk viscosity and thermal conductivity – were studied in the neighborhood of the critical point using molecular dynamics (MD) and the Lennard-Jones potential energy function. MD simulations were performed along the 1.0Pc and 1.2Pc isobars. Green-Kubo relations and a Lennard Jones pair potential were used. Four different sets of Lennard-Jones parameters were used. A comparison of computed shear viscosity and thermal conductivity values with data available from the National Institute of Standards and Technology (NIST) displayed a good agreement. Results for bulk viscosity indicated that values of this property cannot be neglected in this thermodynamic region, a result that violates the traditional and much-assumed Stokes hypothesis in classical fluid mechanics. Furthermore, it was shown that in the neighborhood of the critical region the bulk viscosity can have larger values than the shear viscosity.
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Shear viscosity, Bulk viscosity, Thermal conductivity, Equilibrium molecular dynamics, Stokes hypothesis
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NICHELE, J. et al. Molecular dynamics simulations of momentum and thermal diffusion properties of near-critical argon along isobars. The Journal of Supercritical Fluids, v. 114, p. 46, 2016. Disponível em: <http://www.sciencedirect.com/science/article/pii/S089684461630078X>. Acesso em: 07 ago. 2016.