Cooling of bearing chamber walls is achieved by the through-flow of thin oil films, which are typically only a few millimeters thick. Support structures and other features disrupt both air and oil motion within such chambers, leading to localized variations in the oil film thickness, which in turn cause variation in local heat transfer coefficients. In extreme cases, the presence of wall protrusions may result in complete “dry-out” or thickening of the wall film. This paper describes an experimental study that has been undertaken to establish the range of conditions under which shear driven liquid films dry-out upstream and downstream of different obstacles. Three different sizes (0.5”, 1” & 1.5”) of cylindrical and square obstructions were employed. The effect of obstacle shape, size and orientation has been investigated. The interactions of waves and dry-out patches has also been investigated, as has the dependence on previous states (i.e. the liquid flow rate and the whether the surface was previously wetted). A number of conclusions have been drawn that provide a starting point for designers in specifying obstruction shapes that are less likely to cause film dry-out for obstacles that protrude through film flows.
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ASME Turbo Expo 2006: Power for Land, Sea, and Air
May 8–11, 2006
Barcelona, Spain
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
0-7918-4238-X
PROCEEDINGS PAPER
The Effect of Obstacles in a Liquid Film
Carol Eastwick,
Carol Eastwick
University of Nottingham, Nottingham, UK
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Lucie Bertin,
Lucie Bertin
Ecole Nationale Supe´rieure d’Hydraulique et de Me´canique de Grenoble, France
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Graham Johnson
Graham Johnson
University of Nottingham, Nottingham, UK
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Carol Eastwick
University of Nottingham, Nottingham, UK
Lucie Bertin
Ecole Nationale Supe´rieure d’Hydraulique et de Me´canique de Grenoble, France
Graham Johnson
University of Nottingham, Nottingham, UK
Paper No:
GT2006-90520, pp. 1443-1452; 10 pages
Published Online:
September 19, 2008
Citation
Eastwick, C, Bertin, L, & Johnson, G. "The Effect of Obstacles in a Liquid Film." Proceedings of the ASME Turbo Expo 2006: Power for Land, Sea, and Air. Volume 3: Heat Transfer, Parts A and B. Barcelona, Spain. May 8–11, 2006. pp. 1443-1452. ASME. https://doi.org/10.1115/GT2006-90520
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