A new model is described for micro gas flows that combines a second-order slip boundary condition with a near-wall scaling of the Navier-Stokes constitutive relations. This scheme, which is easily implemented within a conventional CFD framework, is shown to be far more accurate than the conventional second-order slip model at predicting high Knudsen number micro Couette and Poiseuille flows. It is also of equivalent computational cost, and as such, represents a more attractive alternative to the conventional slip approach. It is also shown that the current model is capable of accurately predicting combined Couette/Poiseulle flows at a much higher Knudsen number than second-order slip conditions, which bodes well for the applicability of the scheme to more general configurations.
|Publication status||Published - 2007|
|Event||5th International Conference on Nanochannels, Microchannels and Minichannels - Puebla, Mexico|
Duration: 18 Jun 2007 → 20 Jun 2007
|Conference||5th International Conference on Nanochannels, Microchannels and Minichannels|
|Abbreviated title||ICNMM 2007|
|Period||18/06/07 → 20/06/07|
- gas flow