Motions of Air Bubbles Trapped in Grooved and Plane Journal Bearings of Operating Fluid Dynamic Bearings

Author

Jung, K.M. ; Jung, YoungHoon ; Lee, J.H. ; Jang, H.K. ; Jang, Gun Hee

Author_Institution

Dept. of Mech. Eng., Hanyang Univ., Seoul, South Korea

Volume

49

Issue

6

fYear

2013

fDate

Jun-13

Firstpage

2433

Lastpage

2436

Abstract

We investigated the motion of air bubbles trapped in grooved and plane journal bearings of operating fluid dynamic bearings (FDBs) by using the finite volume method and the volume of fluid method. The motion of a trapped air bubble in grooved journal bearing is mostly determined by surface tension and the pressure difference due to the wedge effect of the groove. Also, the motion of trapped air bubbles in plane journal bearing is mostly determined by surface tension and the Coutte flow. A novel design of FDBs was finally proposed to expel the air bubbles trapped in grooved journal and plane journal bearings out of operating FDBs.

Keywords

bubbles; finite volume methods; fluid dynamics; surface tension; Coutte flow; FDB design; air bubble trapped motions; finite volume method; fluid dynamic bearings; fluid volume method; grooved journal bearing; plane journal bearings; pressure difference; surface tension; wedge effect; Air bubble; fluid dynamic bearings (FDBs); journal bearing; two-phase flow;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2245879

Filename

6522265