Picture of scraped petri dish

Scrape below the surface of Strathprints...

Explore world class Open Access research by researchers at the University of Strathclyde, a leading technological university.

Explore

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

[img] PDF
Reese_JM_Pure_Molecular_free_path_distribution_in_rarefied_gases_14_Mar_2011.pdf - Draft Version

Download (306kB)

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.