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

White, C., Borg, M. K., Scanlon, T. J. and Reese, J. M. (2013) A DSMC investigation of gas flows in micro-channels with bends. Computers and Fluids, 71, pp. 261-271. (doi:10.1016/j.compfluid.2012.10.023)

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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 90-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:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:White, Dr Craig
Authors: White, C., Borg, M. K., Scanlon, T. J., and Reese, J. M.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:Computers and Fluids
Publisher:Elsevier
ISSN:0045-7930
ISSN (Online):1879-0747

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