Effective mean free path and viscosity of confined gases

Journal article


Xie, Jianfei 2019. Effective mean free path and viscosity of confined gases. Physics of Fluids. 31 (7), p. 072002. https://doi.org/10.1063/1.5108627
AuthorsXie, Jianfei
Abstract

The molecular mean free path (MFP) of gases in confined geometries is numerically evaluated by means of the direct simulation Monte Carlo method and molecular dynamics simulations. Our results show that if calculations take into account not only intermolecular interactions between gas molecules but also collisions between gas molecules and wall atoms, then a space-dependent MFP is obtained. The latter, in turn, permits one to define an effective viscosity of confined gases that also varies spatially. Both the gas MFP and viscosity variation in surface-confined systems have been questioned in the past. In this work, we demonstrate that this effective viscosity derived from our MFP calculations is consistent with those deduced from the linear-response relationship between the shear stress and strain rate using independent nonequilibrium Couette-style simulations as well as the equilibrium Green-Kubo predictions.

Keywordsrarefied gas dynamics; mean free path; molecular dynamics
Year2019
JournalPhysics of Fluids
Journal citation31 (7), p. 072002
PublisherAIP Publishing
ISSN10706631
10897666
Digital Object Identifier (DOI)https://doi.org/10.1063/1.5108627
Web address (URL)http://hdl.handle.net/10545/624172
hdl:10545/624172
Publication dates16 Jul 2019
Publication process dates
Deposited03 Oct 2019, 14:23
AcceptedJun 2019
ContributorsUniversity of Derby, University of Edinburgh, University of Strathclyde and University of Warwick
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