Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published 1996 | Published
Book Section - Chapter Open

The Effects of Vapor/Gas Bubbles on the Rotordynamic Forces in Bearings

Abstract

This paper presents an anylytical investigation of the effects that vapor/gas bubbles can have on the fluid-induced rotordynamic forces in a liquid-filled annulus between a cylindrical rotor and a surrounding cylindrical stator. It is demonstrated that such cavitation (vaporous or gaseous) can have important consequences in altering the rotordynamic characteristics of devices such as long journal bearings or long squeeze-film dampers. A linearized analysis which includes bubble dynamic effects is used to evaluate the rotordynamic effects caused by a small amplitude whirl motion of the rotor in both the high and low Reynolds number regimes of fluid motion. In the former case the Euler equations for a bubbly mixture are employed while, in the latter, a modified Reynolds lubrication equation is used. These are combined with a Rayleigh-Plesset analysis of the bubble dynamics which includes various bubble damping effects. It is shown that, in certain parametric regimes, the normal and tangential fluid-induced rotordynamic forces acting on the rotor can deviate substantially from their classical forms in single-phase flow.

Additional Information

This work has been supported by the Italian Ministry of Universities and Scientific Research and by the Office of Naval Research under grant number N-00014-91-K-1295.

Attached Files

Published - DAU164.pdf

Files

DAU164.pdf
Files (482.4 kB)
Name Size Download all
md5:a1220a378c1de5ba51dc84cfe06bd27f
482.4 kB Preview Download

Additional details

Created:
August 21, 2023
Modified:
January 11, 2024