Experimental Investigation of Slider Gas Bearings With Ultra-Thin Films

[+] Author and Article Information
Aron Sereny

Philips Laboratories, A Division of North American Philips Corp., Briarcliff Manor, N. Y. 10510

Vittorio Castelli

Xerox Corporation, Scarsdale, N. Y. 10583

J. of Lubrication Tech 101(4), 510-515 (Oct 01, 1979) (6 pages) doi:10.1115/1.3453403 History: Received May 21, 1979; Online October 20, 2010


The experimental investigation described here involves the highly accurate measurement of bearing clearances on the order of 0.25 μm in self-acting, pivoted, narrow-slider gas bearings. The experimental measurements are based on light interferometry using a variable-wavelength pulsed dye laser and a CW HeNe laser as monochromatic sources. The light interference in the gas bearing is obtained by flying the slider on a very precise, optically flat quartz disk through which the light beam is transmitted. The combined effect of high Knudsen numbers and surface irregularities on the flying height of narrow gas bearings is observed by varying the load on the bearing and the ambient molecular mean free path. The experimentally measured bearing clearances are compared quantitatively with theoretical predictions obtained by numerical solution of Reynolds differential equation for compressible fluids with slip boundary conditions.

Copyright © 1979 by ASME
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