Experimental Determination of Thermal Accommodation Coefficients

  • D. E. Klett
  • R. K. Irey
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 14)


The free molecule flow regime of rarefied gas dynamics and heat transfer is of considerable Interest In any situation dealing with a highly rarefied atmosphere. Free molecule flow occurs when the Knudsen number Kn, is greater than about 3 where Kn = λ/L is the ratio of the mean free path λ to the characteristic length of the system L [1,2]. In a free molecule flow situation collisions between gas molecules are negligible when compared with collisions between gas molecules and the solid surfaces. Hence, a molecule may be considered to travel from one wall to the other without suffering a collision in between.


Heat Transfer Test Chamber Knudsen Number Accommodation Coefficient Thermal Accommodation Coefficient 
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Copyright information

© Springer Science+Business Media New York 1969

Authors and Affiliations

  • D. E. Klett
    • 1
  • R. K. Irey
    • 1
  1. 1.University of FloridaGainesvilleUSA

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