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Problems in Effusion


Stockmair, Wilfried (1959) Problems in Effusion. Engineer's thesis, California Institute of Technology. doi:10.7907/KH55-XN11.


The flow of rarefied gases from a vessel through an orifice into vacuum is studied here. Special conditions of this study are that the mean free path of the molecules is of the same order of magnitude as the hole diameter; furthermore the thickness of the wall is neglected. Knudsen [1,2] investigated this effusion problem for constant conditions throughout the gas, assuming Maxwellian velocity distribution and very large mean free paths. In the present study the influence of a one-dimensional temperature gradient extending from the wall upstream into the gas is investigated. Formulae for the massflux and the spatial intensity distribution of the outflowing molecules are calculated for steady flow conditions. Finally the behavior corresponding to a nonstationary temperature gradient (according to suddenly heated or cooled wall) is studied.

Item Type:Thesis (Engineer's thesis)
Subject Keywords:(Aeronautical Engineering)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Liepmann, Hans Wolfgang (advisor)
  • Cole, Julian D. (advisor)
  • Plesset, Milton S. (advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1959
Record Number:CaltechETD:etd-02072006-131514
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:535
Deposited By: Imported from ETD-db
Deposited On:07 Feb 2006
Last Modified:19 Oct 2023 20:53

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