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Visualization of entry flow separation for oscillating flow in tubesNeutrally buoyant helium-filled soap bubbles with laser illumination are used to document entry flow separation for oscillating flow in tubes. For a symmetric entry case, the size of the separation zone appears to mildly depend on Reynolds number in the acceleration phase, but is roughly Reynolds number independent in the deceleration phase. For the asymmetric entry case, the separation zone was larger and appeared to grow somewhat during the deceleration phase. The separation zones for both entry geometry cases remain relatively small throughout the cycle. This is different from what would be observed in all-laminar, oscillator flows and is probably due to the high turbulence of the flow, particularly during the deceleration phase of the cycle.
Document ID
19930042094
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Qiu, Songgang
(NASA Lewis Research Center Cleveland, OH, United States)
Simon, Terence W.
(Minnesota Univ. Minneapolis, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: IECEC '92; Proceedings of the 27th Intersociety Energy Conversion Engineering Conference, San Diego, CA, Aug. 3-7, 1992. Vol. 5 (A93-25851 09-44)
Publisher: Society of Automotive Engineers, Inc.
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
93A26091
Funding Number(s)
CONTRACT_GRANT: NAG3-598
Distribution Limits
Public
Copyright
Other

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