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Heat transfer in oscillating flows with sudden change in cross sectionOscillating fluid flow (zero mean) with heat transfer, between two parallel plates with a sudden change in cross section, was examined computationally. Over 30 different cases were examined; these cases cover wide ranges of Re sub max (187.5 to 30,000), Va (1 to 350), expansion ratio (1:2, 1:4, 1:8, and 1:12) and A sub r (0.68 to 4). Three different geometric cases were considered (asymmetric expansion and/or contraction, symmetric expansion/contraction, and symmetric blunt body). The heat transfer cases were based on constant wall temperature at higher (heating) or lower (cooling) value than the inflow fluid temperature. As a result of the oscillating flow, the fluid undergoes sudden expansion in one half of the cycle and sudden contraction in the other half. Instantaneous friction factors and heat transfer coefficients, for some ranges of Re sub max and Va, deviated substantially from those predicted with steady state correlations.
Document ID
Document Type
Conference Paper
Ibrahim, Mounir
(NASA Lewis Research Center Cleveland, OH, United States)
Hashim, Waqar
(Cleveland State Univ. OH, United States)
Tew, Roy C.
(NASA Lewis Research Center Cleveland, OH, United States)
Dudenhoefer, James E.
(NASA Lewis Research Center Cleveland, OH, 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)
Subject Category
Fluid Mechanics And Heat Transfer
Funding Number(s)
PROJECT: RTOP 590-13-11
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