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Journal of Enhanced Heat Transfer
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ISSN Imprimir: 1065-5131
ISSN En Línea: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v7.i4.20
pages 231-245

An Experimental Study of Heat Transfer from a Disk Rotating in an Infinite Environment Including Heat Transfer Enhancement by Jet Impingement Cooling

Nader Saniei
Department of Mechanical and Industrial Engineering Southern Illinois University Edwardsville Edwardsville, Illinois, 62026-1805 U.S.A
Xiaojun Terry Yan
Department of Mechanical and Industrial Engineering Southern Illinois University Edwardsville Edwardsville, Illinois, 62026-1805 U.S.A

SINOPSIS

Heat transfer results are presented for a rotating disk cooled with an impinging air jet directed on its free surface. In this study local heat transfer distribution was investigated for a disk freely rotating in space. Then, the effect of rotation and jet impingement were examined. Several important factors, such as rotational Reynolds numbers, jet Reynolds numbers, jet-to-disk spacing and finally location of the jet center relative to the disk center were considered. The disk rotational speed was varied from 250 to 4000 rpm while three jet Reynolds number of 6800, 24000, and 48000 were used. Jet-to-disk spacings of 2 to 8 jet diameters were selected while the jet-to-disk diameter ratio was kept constant at 0.09. The jet was placed perpendicularly to the disk surface at four different distances from the center of the disk. These distances were, zero cm (center-to-center), 3.5 cm, 6.9 cm and 8.9 cm. The heat transfer from the disk was measured using a transient technique which employed liquid crystals. A nearly uniform wall temperature thermal boundary condition was achieved for the disk by constructing an enclosed insulated oven with well-controlled heating elements.


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