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Title: Molecular modeling of force driven gas flows in nano-channels
Authors: Barışık, Murat
Keywords: Argon Gas Flow
Kinetic Theory
Molecular Dynamics
Rarefied Gas Dynamics
Issue Date: 2016
Publisher: International Conference on Computational Fluid Dynamics (ICCFD)
Abstract: Nano-scale gas transport plays an important role in many micro/nanotechnology applications where the rarefied gas dynamics based solutions are frequently used by maintaining a “dynamic similarity” between low pressure (rarefied) and nano gas flows. However, such a consideration is incomplete since the surface force field effects dominant in nano-levels induce significant variations. In order to specify the surface force effects on gas transport, we define a new parameter (B) as the ratio of force penetration length to the channel height, and studied the length scales and conditions for applicability of current rarefied gas dynamics on nano-scale gas flows. Using Molecular Dynamics, force driven gas flows were characterized as a function of B parameter and Knudsen number. Results showed that for a negligible value of B parameter (B?0) transport can be described by rarefied gas dynamics in the whole Knudsen range while the velocity profiles are parabolic and the variation of mass flow rate shows the well-known Knudsen minimum around Kn=1. As the flow dimension decreases, B becomes a finite value indicating the dominancy of surface force effects over rarefaction, and gas velocities and mass transport significantly deviates from the kinetic theory predictions. © 2016 9th International Conference on Computational Fluid Dynamics, ICCFD 2016 - Proceedings. All rights reserved.
Description: 9th International Conference on Computational Fluid Dynamics, ICCFD 2016 -- 11 July 2016 through 15 July 2016
Appears in Collections:Mechanical Engineering / Makina Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

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