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Experimental study of bubble cavities attached to a rotating shaft in a reservoirBubble cavities formed by air entrainment and attached to a rotating shaft in an oil reservoir were studied. The cavities appear to the unaided eye as toroidal. High speed photography, however, reveals the individuality of the bubble cavities and their near solid body rotational characteristics. The cavities are distorted by the rotation effects but remain attached and tend to merge because of edge effects in the axial direction. The flow field within the reservoir is influenced by the unusual character of the two phase fluid found there; the vorticity is readily visualized. Other examples of vapor entrapment at the inlet of an eccentric rotor are also discussed. A simplified analytical method is provided, and a numerical analysis is being investigated. Vapor (void) entrainment and generation can significantly alter leakage rates and stability of seals, bearings, and dampers. Recognition of these effects in the component design systems will result only after detailed studies of the above phenomena.
Document ID
19840009465
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hendricks, R. C. (NASA Lewis Research Center Cleveland, OH, United States)
Braun, M. J. (Akron Univ.)
Mullen, R. L. (Case Western Reserve Univ.)
Date Acquired
September 4, 2013
Publication Date
January 1, 1984
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA-TM-83586
NAS 1.15:83586
E-1975
Meeting Information
Meeting: Cavitation and Multiphase Flow Forum
Location: New Orleans, LA
Country: United States
Start Date: February 11, 1984
End Date: February 17, 1984
Accession Number
84N17533
Funding Number(s)
PROJECT: RTOP 505-32-52
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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