On the Physical Meanings of Λ/Q̃p0 and σ/Q̃p0 in Molecular Gas Film Lubrication Problems

[+] Author and Article Information
S. Fukui

NTT Interdisciplinary Research Laboratory, Nippon Telegraph and Telephone Corp., Musashino-shi, Tokyo 180 Japan

R. Matsuda

School of Administration and Informatics, University of Shizuoka, Shizuoka-shi, 422 Japan

R. Kaneko

NTT Interdiscipiinary Research Laboratory

J. Tribol 118(2), 364-369 (Apr 01, 1996) (6 pages) doi:10.1115/1.2831310 History: Received February 06, 1995; Revised June 28, 1995; Online January 24, 2008


To estimate molecular gas film lubrication (MGL) characteristics, we propose a modified bearing number Λ′ and a modified squeeze number σ′, which are, respectively, the conventional bearing Λ and squeeze number σ divided by the relative Poiseuille flow rate Q̃p0 . Using Λ′ and σ′, the linearized MGL problem can be reduced to the continuum gas film lubrication problem and the MGL characteristics can be exactly estimated, if the characteristic flow rate corresponding to the spacing, Q̃p0 , is known. For nonlinear MGL problems, the lubrication characteristics can be verified to be roughly estimated by Λ′ and σ′ both in rectangular slider bearings and in circular squeeze-film thrust bearings.

Copyright © 1996 by The American Society of Mechanical Engineers
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