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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

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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.

Item type: Article
ID code: 29474
Keywords: molecular free paths, rarefied gases , molecular dynamics simulations , gas flows in micro and nanoscale devices, Mechanical engineering and machinery, Physics, Mechanical Engineering, Computational Mechanics, Modelling and Simulation
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: 21 Jul 2015 18:45
Related URLs:
URI: http://strathprints.strath.ac.uk/id/eprint/29474

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