Gas Flows in the Transition and Free Molecular Flow Regimes

  • A. Beskok
Conference paper
Part of the NATO Science for Peace and Security Series A: Chemistry and Biology book series (NAPSA)


We investigate pressure driven flow in the transition and free-molecular flow regimes with the objective of developing unified flow models for channels and ducts. These models are based on a velocity scaling law, which is valid for a wide range of Knudsen number. Simple slip-based descriptions of flowrate in channels and ducts are corrected for effects in the transition and free-molecular flow regimes with the introduction of a rarefaction coefficient. The resulting models can predict the velocity distribution, mass flowrate, pressure and shear stress distribution in rectangular ducts in the entire Knudsen flow regime.


Velocity Slip Knudsen Number Slip Boundary Condition Rectangular Duct Duct Flow 
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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.Aerospace Engineering DepartmentOld Dominion UniversityNorfolkUSA

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