Capturing the Knudsen layer in continuum-fluid models of non-equilibrium gas flows

Duncan A. Lockerby, Jason M. Reese, Michael A. Gallis

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Abstract

In hypersonic aerodynamics and microflow device design, the momentum and energy fluxes to solid surfaces are often of critical importance. However, these depend on the characteristics of the Knudsen layer - the region of local non-equilibrium existing up to one or two molecular mean free paths from the wall in any gas flow near a surface. While the Knudsen layer has been investigated extensively using kinetic theory, the ability to capture it within a continuum-fluid formulation (in conjunction with slip boundary conditions) suitable for current computational fluid dynamics toolboxes would offer distinct and practical computational advantages.
Original languageEnglish
Pages (from-to)1391-1393
Number of pages2
JournalAIAA Journal
Volume43
Issue number6
Publication statusPublished - Jun 2005

Keywords

  • knudsen layer
  • gases
  • atomic physics
  • mechanical engineering
  • hypersonic aerodynamics
  • microflow devices

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    Lockerby, D. A., Reese, J. M., & Gallis, M. A. (2005). Capturing the Knudsen layer in continuum-fluid models of non-equilibrium gas flows. AIAA Journal, 43(6), 1391-1393.