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

Craig White, Matthew Karl Borg, Thomas Scanlon, Jason Reese

Research output: Contribution to journalArticle

57 Citations (Scopus)
605 Downloads (Pure)

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.
Original languageEnglish
Pages (from-to)261-271
JournalComputers and Fluids
Volume71
DOIs
Publication statusPublished - 30 Jan 2013

Keywords

  • DSMC
  • micro-channel
  • bend
  • transition regime
  • rarefied gas dynamics

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