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Cryogenic Vacuum Pumping

  • W. W. Balwanz
Conference paper
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 9)

Abstract

Cryogenically cooled baffles are now considered an integral part of space-simulation systems, and often serve as an important part of the pumping system. The design of such baffles requires a knowledge of their ability to cool and capture gas molecules colliding with the cold surface. This ability, in turn, depends upon the forces between the gas molecule and the bound surface molecule with which it collides, upon the rate of collisions with the surface, and upon the velocity energy difference between the two molecules. Surface coatings with interstices in the matrix structure may be used to cause a number of collisions to occur while the gas molecule is on the cooled surface, thus materially increasing the cooling and sticking probability.

Keywords

Cold Surface Tank Wall Sticking Coefficient Sticking Probability Proper Matrix 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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    J. O. Hirschfelder, C. F. Curtiss, and R. B. Bird, Molecular Theory of Gases and Liquids, J, Wiley & Sons, New York (1954), chapts. 2, 8.Google Scholar
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    L. Pauling, The Nature of the Chemical Bond, Cornell University Press, Ithaca, New York (1948), p. 302.Google Scholar
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    A. F. Wells, Structural Inorganic Chemistry, Oxford, Clarendon Press (1962), Chapt. 15.Google Scholar
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    B. J. Mason, G. W. Bryant, A. P. Vanden Heuvel, Phil Mag., 8, 505 (1963).CrossRefGoogle Scholar
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    W. W. Balwanz, J. M. Singer, and N. P. Frandsen, in Advances in Cryogenic Engineering, Vol. 6, Plenum Press, New York (1961), p. 195.Google Scholar

Copyright information

© Springer Science+Business Media New York 1964

Authors and Affiliations

  • W. W. Balwanz
    • 1
  1. 1.Naval Research LaboratoryUSA

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