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RESEARCH PAPERS

Phase Change in Liquid Face Seals

[+] Author and Article Information
W. F. Hughes, N. S. Winowich, M. J. Birchak

Department of Mechanical Engineering, Carnegie-Mellon University, Pittsburgh, Penn.

W. C. Kennedy

Gannon College, Erie, Penn.

J. of Lubrication Tech 100(1), 74-79 (Jan 01, 1978) (6 pages) doi:10.1115/1.3453117 History: Received June 25, 1977; Online October 20, 2010

Abstract

A study is made of boiling (or phase change) in liquid face seals. An appropriate model is set up and approximate solutions obtained. Some practical illustrative examples are given. The principal conclusions are: 1) Boiling may occur more often than has been suspected particularly when the sealed liquid is near saturation conditions. 2) The temperature variation in a seal clearance region may not be very great and the main reason for boiling is the flashing which occurs as the pressure decreases through the seal clearance. 3) There are two separate values of the parameter (h/ω2 ) (and associated radii where phase change takes place) which provide the same separating force under a given set of operating conditions. For a given speed seal face excursions about the larger spacing are stable, but excursions about the smaller spacing are unstable, leading to a growth to the larger spacing or a catastrophic collapse.

Copyright © 1978 by ASME
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