Rarefied Gas Flow Through a Circular Orifice and Short Tubes

[+] Author and Article Information
Tetsuo Fujimoto

Department of Electronic-Mechanical Engineering, University of Nagoya, Furocho, 464 Nagoya, Japan

Masaru Usami

Department of Mechanical Engineering, University of Mie, Kamihamacho, 514 Tsu, Japan

J. Fluids Eng 106(4), 367-373 (Dec 01, 1984) (7 pages) doi:10.1115/1.3243132 History: Received November 30, 1982; Online October 26, 2009


Rarefied gas flow through a circular orifice and short tubes has been investigated experimentally, and the conductance of the aperture has been calculated for Knudsen number between 2 × 10−4 and 50. The unsteady approach was adopted, in which the decay of pressure in an upstream chamber was measured as a function of time. For flow with high pressure ratio, empirical equations of the conductance are proposed as a function of Reynolds number, or Knudsen number, and length-to-diameter ratio of the apertures.

Copyright © 1984 by ASME
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