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
| Authors | Xie, 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. |
| Keywords | rarefied gas dynamics; mean free path; molecular dynamics |
| Year | 2019 |
| Journal | Physics of Fluids |
| Journal citation | 31 (7), p. 072002 |
| Publisher | AIP Publishing |
| ISSN | 10706631 |
| 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 dates | 16 Jul 2019 |
| Publication process dates | |
| Deposited | 03 Oct 2019, 14:23 |
| Accepted | Jun 2019 |
| Contributors | University of Derby, University of Edinburgh, University of Strathclyde and University of Warwick |
| File | File Access Level Open |
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