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Analysis of laminar flow in the entrance region of parallel plate microchannels for slip flow

Sadeghi, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1115/ICNMM2009-82012
  3. Abstract:
  4. Microscale fluid dynamics has received intensive interest due to the emergence of microelectromechanical systems (MEMS) technology. Fluid flow in microdevices has some characteristics which one of them is rarefaction effect related with gas flow. In this work, the steady state laminar rarefied gas flow in the entrance region of parallel plate microchannels is investigated by the integral method with slip flow conditions at solid surface. The effects of Knudsen number on friction factor and Nusselt number are presented in graphical form as well as analytical form. Also the effect of Knudsen number on hydrodynamic entry length is presented. The results show that as Knudsen number increases the local friction factor and Nusselt number decrease. Also an increment of Knudsen number leads to a larger amount of hydrodynamic entry length
  5. Keywords:
  6. Integral solution ; Microchannel ; Entrance region ; Entry length ; Fluid flow ; Friction factors ; Gas flows ; Graphical forms ; Integral method ; Integral solutions ; Knudsen number ; Knudsen numbers ; Local friction ; Micro devices ; Micro-scales ; Microelectromechanical-systems technologies ; Parallel plates ; Rarefied gas flow ; Slip flow ; Solid surface ; Steady state ; Aerodynamics ; Electromechanical devices ; Flow of gases ; Fluid dynamics ; Friction ; Hydrodynamics ; Laminar flow ; MEMS ; Nusselt number ; Parallel flow ; Pipe flow ; Vehicular tunnels ; Microchannels
  7. Source: Proceedings of the 7th International Conference on Nanochannels, Microchannels, and Minichannels 2009, ICNMM2009, 22 June 2009 through 24 June 2009, Pohang ; Issue PART A , 2009 , Pages 345-352 ; 9780791843499 (ISBN)
  8. URL: http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1626561