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RESEARCH PAPERS

The Hydrodynamics of a Plug Bearing

[+] Author and Article Information
I. Etsion

NASA Lewis Research Center, Cleveland, Ohio; Department of Aeronautical Engineering of the Technion, Haifa, Israel

O. Pinkus

Mechanical Technology Inc., Latham, N. Y.; Department of Aeronautical Engineering of the Technion, Haifa, Israel

J. of Lubrication Tech 98(3), 433-440 (Jul 01, 1976) (8 pages) doi:10.1115/1.3452883 History: Received July 02, 1975; Online October 20, 2010

Abstract

The notion of a “plug” bearing taken up in this work refers to bodies moving within tight circular conduits. Our interest lies in the hydrodynamic film generated in the narrow interspace between body and wall under conditions of an incompressible fluid and unequal boundary pressures. For generality rotation as well as translation is considered. Performance characteristics are given for nontilting frustums, both diverging and converging in the direction of motion. It is shown that for a given body shape the amount of leakage past the plug is the same regardless of its orientation. However, with geometries whose film increases in the direction of plug velocity there is a wide range of operating conditions when the resultant force is such as to drive the body against the wall of the conduit; over the same range, shapes which produce films decreasing in the direction of motion yield a floating force.

Copyright © 1976 by ASME
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