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A DSMC investigation of gas flows in micro-channels with bends

White, Craig and Borg, Matthew Karl and Scanlon, Thomas and Reese, Jason (2013) A DSMC investigation of gas flows in micro-channels with bends. Computers and Fluids, 71. pp. 261-271. ISSN 0045-7930

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Abstract

Pressure-driven, implicit boundary conditions are implemented in an open source direct simulation Monte Carlo (DSMC) solver, and benchmarked against simple micro-channel flow cases found in the literature. DSMC simulations are then carried out of gas flows for varying degrees of rarefaction along micro-channels with both one and two ninety-degree bends. The results are compared to those from the equivalent straight micro-channel geometry. Away from the immediate bend regions, the pressure and Mach number profiles do not differ greatly from those in straight channels, indicating that there are no significant losses introduced when a bend is added to a micro-channel geometry. It is found that the inclusion of a bend in a micro-channel can increase the amount of mass that a channel can carry, and that adding a second bend produces a greater mass flux enhancement. This increase happens within a small range of Knudsen number (0.02 Knin 0.08). Velocity slip and shear stress profiles at the channel walls are presented for the Knudsen showing the largest mass flux enhancement.

Item type: Article
ID code: 42237
Keywords: DSMC, micro-channel, bend, transition regime, rarefied gas dynamics, Mechanical engineering and machinery, Mechanical Engineering, Mechanics of Materials, Computational Mechanics
Subjects: Technology > Mechanical engineering and machinery
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Technology and Innovation Centre > Advanced Engineering and Manufacturing
Depositing user: Pure Administrator
Date Deposited: 30 Nov 2012 12:06
Last modified: 29 Mar 2015 02:37
URI: http://strathprints.strath.ac.uk/id/eprint/42237

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