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Three‐dimensional incompressible flow of a gas through feed holes into an annular space of finite length
Author(s) -
Uneeb M.,
Gohar R.
Publication year - 1997
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010090204
Subject(s) - mechanics , compressibility , inertia , flow (mathematics) , space (punctuation) , plane (geometry) , incompressible flow , mathematics , physics , materials science , geometry , classical mechanics , computer science , operating system
This paper presents a theoretical model of the three‐dimensional flow of an incompressible gas in a concentric double‐plane admission externally pressurised gas journal bearing. Inertia effects and the discreteness of the feed holes are included. The flow map demonstrates the formation of a vena contracta at the commencement of the film, downstream of the feed holes, as well as detailed behaviour of the streaklines within the film. The pressure profile obtained shows a depression at the vena contracta, followed by a partial recovery which varies around the feed holes, depending on whether the local flow is exiting between the rows of holes or outboard towards atmosphere. A comparison is also made with a similar one‐dimensional incompressible flow solution to obtain flow and pressure factors, to account for the discreteness of the feed holes as well as inertia effects.