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Corresponding Author

El-Negiry, Emad

Subject Area

Mechanical Power Engineering

Article Type

Original Study

Abstract

Natural convection heat transfer from vertical fin arrays of different fin geometry is experimentally investigated. Number, thickness and height of fins are kept constant while base to ambient temperature difference is varied. Experiments are carried out for vertical and horizontal fin array base plate. The Raleigh number is ranged from 2x103 to 8x103. Results showed that the average heat transfer coefficient is greatly affected by the base-to-ambient temperature difference and less affected by the fin geometry and base plate orientation. Over the tested range of Rayleigh number, and with vertical base plate arrays, the straight fin array offered the highest heat transfer coefficient (by a factor of 15% and 10% more than that of unsymmetrical and symmetrical corrugated sin array respectively). An enhancement in the heat transfer coefficient by a factor of about 10 % for the straight fin array more than that of horizontal base plate is also observed and that enhancement is reduced to about 4 and 2% for unsymmetrical and symmetrical corrugated fin array respectively. The effect of both orientation and fin geometry seems to be diminished with the increase of Rayleigh number.

Keywords

Convective heat transfer; Fin arrays; cooling of electronic equipment; Natural convection; Heat sinks

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