On the Local Compressibility Effect in Spiral-Groove Bearings

[+] Author and Article Information
V. N. Constantinescu

Institute of Fluid Mechanics of the Romanian Academy, Bucharest, Rumania

V. Castelli

Columbia University, New York, N. Y.

J. of Lubrication Tech 91(1), 79-86 (Jan 01, 1969) (8 pages) doi:10.1115/1.3554902 History: Received March 25, 1968; Online August 23, 2011


In order to determine the qualitative effect of lubricant compressibility in groove bearings, the Whipple’s method already used in several papers references [1–8]1 is employed, but eliminating, however, certain approximations, especially the consideration of constant pressure gradients perpendicular to the groove edge. Under these conditions one shows that the analysis is consistent with the normal limiting solution of ph = const, which takes place when the compressibility number increases indefinitely. Grooved bearings behave thus similarly to the usual step bearings, but they operate at a much smaller local compressibility number. Some considerations concerning the values of the compressibility number at which the compressibility effect must be taken into account are given. An exact solution obtained by numerical methods over a no-throughflow groove-ridge pair with cyclic conditions is presented over the entire range of compressibility numbers of interest to show the actual influence of local compressibility.

Copyright © 1969 by ASME
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