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Effective mean free path and viscosity of confined gases
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Xie, Jianfei, Borg, Matthew K., Gibelli, Livio, Henrich, Oliver, Lockerby, Duncan A. and Reese, Jason M. (2019) Effective mean free path and viscosity of confined gases. Physics of Fluids, 31 (7). 072002. doi:10.1063/1.5108627 ISSN 1089-7666.
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WRAP-Effective-free-path-viscosity-confined-gases-Lockerby-2019.pdf - Accepted Version - Requires a PDF viewer. Download (1047Kb) | Preview |
Official URL: https://doi.org/10.1063/1.5108627
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.
Item Type: | Journal Article | ||||||||||||||||||
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Subjects: | Q Science > QC Physics Q Science > QP Physiology |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||||||||||||
SWORD Depositor: | Library Publications Router | ||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Rarefied gas dynamics, Molecular dynamics | ||||||||||||||||||
Journal or Publication Title: | Physics of Fluids | ||||||||||||||||||
Publisher: | AIP Publishing | ||||||||||||||||||
ISSN: | 1089-7666 | ||||||||||||||||||
Official Date: | 16 July 2019 | ||||||||||||||||||
Dates: |
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Volume: | 31 | ||||||||||||||||||
Number: | 7 | ||||||||||||||||||
Article Number: | 072002 | ||||||||||||||||||
DOI: | 10.1063/1.5108627 | ||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||
Reuse Statement (publisher, data, author rights): | This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. | ||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||
Date of first compliant deposit: | 29 July 2019 | ||||||||||||||||||
Date of first compliant Open Access: | 29 July 2019 | ||||||||||||||||||
RIOXX Funder/Project Grant: |
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