A mean free path approach to the micro/nanochannel gas flows

Journal article


Xie, Jianfei 2020. A mean free path approach to the micro/nanochannel gas flows. Advances in Aerodynamics. https://doi.org/10.1186/s42774-020-00035-w
AuthorsXie, Jianfei
Abstract

We investigate the gas flows near to solid surfaces in terms of the local spatial variation in the molecular mean free path (MFP). Molecular dynamics (MD) is the appropriate scientific tool for obtaining molecularly-accurate dynamic information in micro and nano-scale gas flows, and has been used to evaluate the molecular mean free path of gases. In the calibration procedure, the viscosity of a gas in the homogeneous case can be recovered in our MD simulations and reach good agreement with the theoretical prediction and data from NIST. In surface-bounded gas flows, if the collisions between gas molecules and walls are counted, a spatially-varying mean free path is presented,
and for the first time we have observed that the distribution of the free paths deviates from the exponential one and spikes appear in their distributions at larger Kn, i.e. in the transition flow regime. Based on elementary kinetic theory, the effective viscosity of the gas derived from the mean free path has been incorporated into the framework of the continuum-fluid dynamics equations, and micro-Couette flows are performed to demonstrate this potential application.

KeywordsRarefied gas dynamics, mean free path, molecular dynamics
Year2020
JournalAdvances in Aerodynamics
PublisherSpringer Nature
ISSN2524-6992
Digital Object Identifier (DOI)https://doi.org/10.1186/s42774-020-00035-w
Web address (URL)http://hdl.handle.net/10545/624793
hdl:10545/624793
Publication dates07 May 2020
Publication process dates
Deposited07 May 2020, 13:01
Accepted15 Apr 2020
ContributorsUniversity of Derby
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