Effusive flow conductance of shielded circular channels

S. O. Colgate*, Ed Colgate

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A circular shield coaxial with the conductance channel and spaced a small distance from the channel entrance is used to establish a well defined gas density gradient inside the effusion cell. The gradient and the resultant channel conductance are calculated by previously presented methods with the additional approximation that the plane of entrance to the channel is taken to be a partial absorber and a partial diffuse reflector with the absorption coefficient being the conventional Clausing factor of the channel. Transmission coefficients are calculated for a number of reduced geometries, and a practical means of fabricating shielded conductance elements is described.

Original languageEnglish (US)
Pages (from-to)585-589
Number of pages5
Issue number5
StatePublished - May 1984

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films


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