Molecular free path distribution in rarefied gases

Dongari, Nishanth and Zhang, Yonghao and Reese, Jason (2011) Molecular free path distribution in rarefied gases. Journal of Physics D: Applied Physics, 44 (12). Article 125502. ISSN 0022-3727 (https://doi.org/10.1088/0022-3727/44/12/125502)

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Abstract

We present the results of investigations into the distribution of molecular free paths in rarefied gases using molecular dynamics simulations. Our tests on a range of different gas densities and confinements (unbounded, single bounding wall and parallel bounding walls) indicate that the molecules perform Lévy-type flights, irrespective of the presence of a bounding wall. The free paths most closely follow a power-law distribution. Simulations of gases confined by planar surfaces indicate that the local molecular mean free path varies sharply close to a solid surface. These results may yield new insight into diffusive transport in rarefied gases, in particular, the constitutive behaviour of gas flows in micro- and nanoscale devices.

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• Item metadata

  Item type:	Article
  ID code:	29474
  Dates:	Date Event 30 March 2011 Published
  Subjects:	Technology > Mechanical engineering and machinery Science > Physics
  Department:	Faculty of Engineering > Mechanical and Aerospace Engineering
  Depositing user:	Pure Administrator
  Date deposited:	15 Mar 2011 05:10
  Last modified:	15 Apr 2024 16:20
  Related URLs:	Scopus publication
  URI:	https://strathprints.strath.ac.uk/id/eprint/29474