Molecular free path distribution in rarefied gases

Nishanth Dongari, Yonghao Zhang, Jason Reese

Research output: Contribution to journalArticle

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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.
Original languageEnglish
Pages (from-to)Article 125502
Number of pages6
JournalJournal of Physics D: Applied Physics
Volume44
Issue number12
DOIs
Publication statusPublished - 30 Mar 2011

Fingerprint

Rarefied Gas
rarefied gases
Gases
Path
Constitutive Behavior
Density of gases
Power-law Distribution
Gas Dynamics
gas density
Gas Flow
solid surfaces
microbalances
mean free path
Molecular Dynamics Simulation
gas flow
Flow of gases
Molecular dynamics
simulation
Molecules
flight

Keywords

  • molecular free paths
  • rarefied gases
  • molecular dynamics simulations
  • gas flows in micro and nanoscale devices

Cite this

Dongari, Nishanth ; Zhang, Yonghao ; Reese, Jason. / Molecular free path distribution in rarefied gases. In: Journal of Physics D: Applied Physics. 2011 ; Vol. 44, No. 12. pp. Article 125502.
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Molecular free path distribution in rarefied gases. / Dongari, Nishanth; Zhang, Yonghao; Reese, Jason.

In: Journal of Physics D: Applied Physics, Vol. 44, No. 12, 30.03.2011, p. Article 125502.

Research output: Contribution to journalArticle

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