Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/5900
Title: Molecular free paths in nanoscale gas flows
Authors: Barışık, Murat
Beşkök, Ali
Barışık, Murat
Keywords: Molecular dynamics
Molecular surface force effects
Rarefied gas dynamics
Transition flow regime
Flow of gases
Issue Date: 1-May-2015
Publisher: Springer Verlag
Source: Barışık, M., and Beşkök, A. (2015). Molecular free paths in nanoscale gas flows. Microfluidics and Nanofluidics, 18(5-6),1365-1371. doi:10.1007/s10404-014-1535-3
Abstract: Average distance traveled by gas molecules between intermolecular collisions, known as the mean free path (MFP), is a key parameter for characterizing gas flows in the entire Knudsen regime. Recent literature presents variations in MFP as a function of the surface confinement, which is in disagreement with the kinetic theory and leads to wrong physical interpretations of nanoscale gas flows. This controversy occurs due to erroneous definition and calculation practices, such as consideration of gas wall collisions, using local bins smaller than a MFP, and utilizing time frames shorter than a mean collision time in the MFP calculations. This study reports proper molecular MFP calculations in nanoscale confinements by using realistic molecular surfaces. We utilize molecular dynamics (MD) simulations to calculate gas MFP in three-dimensional periodic systems of various sizes and for force-driven gas flows confined in nano-channels. Studies performed in the transition flow regime in various size nano-channels and under a range of gas–surface interaction strengths have shown isotropic mean travelled distance and MFP values in agreement with the kinetic theory regardless of the surface forces and surface adsorption effects. Comparison of the velocity profiles obtained in MD simulations with the linearized Boltzmann solutions at predicted Knudsen values shows good agreement in the bulk of the channels, while deviations in the near wall region due to the influence of surface forces are reported.
URI: https://doi.org/10.1007/s10404-014-1535-3
http://hdl.handle.net/11147/5900
ISSN: 1613-4982
16134990
Appears in Collections:Mechanical Engineering / Makina Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Files in This Item:
File Description SizeFormat 
5900.pdfMakale611.33 kBAdobe PDFThumbnail
View/Open
Show full item record

CORE Recommender

SCOPUSTM   
Citations

22
checked on Oct 23, 2021

WEB OF SCIENCETM
Citations

21
checked on Oct 23, 2021

Page view(s)

22
checked on Oct 26, 2021

Download(s)

24
checked on Oct 26, 2021

Google ScholarTM

Check

Altmetric


Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.