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Development of a consistent slip boundary condition at the inlet of microchannels

Darbandi, M ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. Publisher: 2006
  3. Abstract:
  4. The fast progress in Microelectromechanical systems has drawn the attention of many numerical workers to provide sufficient numerical tools to analyze the micro flows accurately. Besides many ambiguities behind the slip boundary condition research which are normally encountered in the vicinity of the solid walls (and are necessary to provide the suitable bridge between the macro and micro behaviors), there are serious uncertainties at the inlet of channels where the microflow enters into the conduit. Indeed, the macro inlet flow have been long investigated by the past workers; however, there is little effort to clarify the issue in micro inlet flow cases. In this research, we utilize the outcomes of the past research behind the macro entry flow problem and suitably extend them to micro flow applications. To avoid the singularities at the inlet and nearby the walls, we implement suitable boundary conditions far upstream of the channel. However, to achieve correct boundary conditions at the inlet, suitable symmetric boundary conditions are implemented at the fictitious walls extended upstream of the channel's inlet. This strategy eliminates the singularities at the inlet of channel which is normally observed in numerical treatment of macro-entry flow problems
  5. Keywords:
  6. Micro flows ; Numerical tools ; Numerical treatment ; Slip boundary condition ; Boundary conditions ; Intake systems ; Numerical methods ; Problem solving ; Wall flow ; Microchannels
  7. Source: 44th AIAA Aerospace Sciences Meeting 2006, Reno, NV, 9 January 2006 through 12 January 2006 ; Volume 10 , 2006 , Pages 7087-7096 ; 1563478072 (ISBN); 9781563478079 (ISBN)
  8. URL: https://arc.aiaa.org/doi/10.2514/6.2006-591