Article history: Three basic diffusion properties of argon – shear viscosity, bulk viscosity and thermal conductivity – were Received 18 October 2015 studied in the neighborhood of the critical point using molecular dynamics (MD) and the Lennard-Jones Received in revised form 11 April 2016 potential energy function. MD simulations were performed along the 1.0P and 1.2P isobars. Green-Kubo c c Accepted 11 April 2016 relations and a Lennard-Jones pair potential were used. Four different sets of Lennard-Jones parameters Available online 12 April 2016 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 Keywords: bulk viscosity indicated that values of this property cannot be neglected in this thermodynamic region, Shear viscosity a result that violates the traditional and much-assumed Stokes hypothesis in classical ﬂuid mechanics. Bulk viscosity Furthermore, it was shown that in the neighborhood of the critical region the bulk viscosity can have Thermal conductivity larger values than the shear viscosity. Equilibrium molecular dynamics Stokes hypothesis © 2016 Elsevier B.V. All rights reserved. 1. Introduction However, in the neighborhood of the critical point, availability of transport coefﬁcient data
The Journal of Supercritical Fluids – Elsevier
Published: Aug 1, 2016
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