Authors
Xie, JianfeiAffiliation
University of DerbyUniversity of Edinburgh
University of Strathclyde
University of Warwick
Issue Date
2019-07-16
Metadata
Show full item recordAbstract
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.Citation
Xie, J., Borg, M.K., Gibelli, L., Henrich, O., Lockerby, D.A. and Reese, J.M., (2019). 'Effective mean free path and viscosity of confined gases'. Physics of Fluids, 31(7), pp. 1-31. DOI: 10.1063/1.5108627Publisher
AIP PublishingJournal
Physics of FluidsDOI
10.1063/1.5108627Additional Links
https://aip.scitation.org/doi/10.1063/1.5108627https://strathprints.strath.ac.uk/68893/
Type
ArticleLanguage
enISSN
10706631EISSN
10897666ae974a485f413a2113503eed53cd6c53
10.1063/1.5108627