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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

CORRELATION BETWEEN HEAT TRANSFER AND FLUCTUATING PRESSURE IN THE SEPARATED REGION OF A BLUFF BODY

Get access (open in a dialog) DOI: 10.1615/IHTC8.450
pages 1023-1028

Abstract

Experimental investigations were carried out on the heat transfer in the separated region of bluff bodies of various shapes. The relationship between the average heat transfer and the R.M.S. fluctuating pressure on the rear face was examined.
The wake of a circular cylinder was controlled in two ways: by setting up two small cylinders inside the separated shear layers and by placing a splitter plate behind the cylinder. The former controlled the unsteadiness of the shear layers, the latter controlled the vortex formation region.
For a square prism, at angle of attack α = 13°, the shear layer separated from the leading edge and reattached to the side face, whereupon the average heat transfer on the rear face was a minimum. For a rectanglar cylinder, the average heat transfer on the rear face changes drastically corresponding to the difference in flow patterns for two critical values of the width to height ratio, 0.67 and 2.8.
The average heat transfer on the rear face of bluff bodies is correlated with the fluctuating pressure coefficient, Cpr’, as follows Nub = C(√( Cpr’)Re)0.6, where the constant С depends on the behavior of the shear layer.