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Unsteady heat transfer and direct comparison to steady-state measurements in a rotor-wake experimentCircumferentially local and time-resolved heat transfer measurements were obtained for a circular cylinder in crossflow located downstream of a rotating spoked wheel wake generator in a steady flow tunnel. The unsteady heat transfer effects were obtained by developing an extension of a thin film gauge technique employed to date exclusively in short-duration facilities. The time-average thin film results and conventional steady-state heat transfer measurements were compared. Time-averaged wake-induced stagnation heat transfer enhancement levels above the nowake case were about 10 percent for the four cylinder Reynolds numbers. This enhancement level was nearly independent of bar passing frequency and was related directly to the time integral of the heat transfer spikes observed at the bar passing frequency. It is observed that the wake-induced heat transfer spikes have peak magnitudes averaging 30 to 40 percent above the interwake heat transfer level.
Document ID
19870043446
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Obrien, J. E.
(NASA Lewis Research Center Cleveland, OH, United States)
Simoneau, R. J.
(NASA Lewis Research Center Cleveland, OH, United States)
Morehouse, K. A.
(NASA Lewis Research Center Cleveland, OH, United States)
Lagraff, J. E.
(Syracuse University NY, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1986
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
87A30720
Distribution Limits
Public
Copyright
Other

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