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    Effective mean free path and viscosity of confined gases

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    Authors
    Xie, Jianfei
    Affiliation
    University of Derby
    University of Edinburgh
    University of Strathclyde
    University of Warwick
    Issue Date
    2019-07-16
    
    Metadata
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    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.
    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: 10.1063/1.5108627
    Publisher
    AIP Publishing
    Journal
    Physics of Fluids
    URI
    http://hdl.handle.net/10545/624172
    DOI
    10.1063/1.5108627
    Additional Links
    https://aip.scitation.org/doi/10.1063/1.5108627
    https://strathprints.strath.ac.uk/68893/
    Type
    Article
    Language
    en
    ISSN
    10706631
    EISSN
    10897666
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.5108627
    Scopus Count
    Collections
    Department of Mechanical Engineering & the Built Environment

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