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    Variation of molecular mean free path in confined geometries

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    Authors
    Xie, Jianfei cc
    Affiliation
    University of Edinburgh
    Issue Date
    2019-08-05
    
    Metadata
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    Abstract
    This paper aims to settle disputes in the literature about the spatial variation of the molecular mean free path (MFP) in confined geometries. The MFP of a gas is determined by using both molecular dynamics (MD) and the direct simulation Monte Carlo (DSMC) technique. In spatially-homogeneous cases, the numerical results exactly recover the kinetic theory predictions of a constant MFP. However, in microchannels, the MFP is found to vary near to the bounding walls and reduce at the surfaces to half of its bulk value as long as collisions between gas molecules and wall atoms are taken into account in the calculation of the MFP.
    Citation
    Xie, J., Gibelli, L., Borg., M. K., Henrich, O., Lockerby,. D. A., and Reese, J., M. (2019) ‘Variation of molecular mean free path in confined geometries’. 31st International Symposium on Rarefied Gas Dynamics: RGD31. Glasgow, United Kingdom, 23-27 July, pp. 1-8. DOI: 10.1063/1.5119594.
    Publisher
    AIP Publishing
    Journal
    AIP Conference Proceedings
    URI
    http://hdl.handle.net/10545/624171
    DOI
    10.1063/1.5119594.
    Additional Links
    https://aip.scitation.org/doi/abs/10.1063/1.5119594
    Type
    Meetings and Proceedings
    Language
    en
    ISBN
    9780735418745
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.5119594.
    Scopus Count
    Collections
    Department of Mechanical Engineering & the Built Environment

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