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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Modified Endwall Fluid Flow in a Dimpled Pin Fin Array for Heat Transfer Enhancement

Get access (open in a dialog) DOI: 10.1615/IHTC15.cnv.009230
pages 1599-1610

Résumé

By adding dimples to pin-fins it is possible to enhance the heat transfer, however, all of the work on dimpled pin-fins has been done on either a single pin-fin or one row of pin-fins and no work so far has been done on an array of dimpled pin fins. It was the purpose of this study to experimentally measure the flow field within a staggered array of short dimpled pin-fins and use the results to predict possible heat transfer enhancement on the endwall. Measurements were conducted in a wind tunnel on a scale model with 13 staggered rows of 50 mm diameter pin-fins with a height of 64 mm and streamwise and spanwise spacing of 100 mm. The dimples were 5.2 mm in diameter, had a depth of 0.82 mm and were machined asymmetrically with an offset of 3.87 mm. For comparison purposes measurements were also taken on smooth pin-fins of the same dimensions. Results were obtained for a Reynolds numbers of 40 000 using a L-shaped five-hole probe. The results showed an increase in vorticity for the dimpled configuration, greater streamwise velocity acceleration, and the development of additional secondary flows between the endwall and bulk flow. All three conclusions predict an increase in endwall heat transfer for a dimpled pin-fin array.