Free Molecule Flow Through a Vacuum Seal

[+] Author and Article Information
H. S. Yu

Engineering Research Department, 3 M Company, St. Paul, Minn.

E. M. Sparrow

Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minn.

J. Basic Eng 92(3), 405-410 (Sep 01, 1970) (6 pages) doi:10.1115/1.3425012 History: Received July 31, 1969; Online October 27, 2010


An analysis is made of the rate of the mass flow through a vacuum seal separating two rarefied gas environments. The determination of the mass throughflow characteristics involves the formulation and solution of a coupled system of six integral equations. The formulation is performed using the methods of kinetic theory. Numerical solutions are carried out for a wide range of values of the seal geometrical parameter. Mass flow results evaluated from these solutions are presented graphically. In addition, representative distributions of the mass fluxes at the participating surfaces are given.

Copyright © 1970 by ASME
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