Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 44, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/44/12/125502
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Funding
- European Community [215504]
- Royal Academy of Engineering
- Leverhulme Trust
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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 Levy-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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