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Heat Transfer Research
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ISSN Imprimir: 1064-2285
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2018025317
Forthcoming Article

A Study of Enhanced Heat Transfer for a Plate-Fin Heat Sink by Operating Piezoelectric Fans

Herchang Ay
Department of Mold and Die Engineering, National Kaohsiung University of Science and Technology & St. John’s University
Heng-Pin Hsu
Department of Mold and Die Engineering, National Kaohsiung University of Science and Technology
Hung-Yi Li
Department of Mold and Die Engineering, National Kaohsiung University of Science and Technology
Ping-Tse Wu
Department of Mold and Die Engineering, National Kaohsiung University of Science and Technology

RESUMO

The purpose of this study is to explore the heat dissipation efficiency of piezoelectric fan with different type heat sinks by changing the piezoelectric fan height which is relative to three different heat sinks. This study use flow visualization technique with driven by 110V, 60Hz and fix the amplitude range of piezoelectric fan and distance (0.5 mm,1mm,2mm,3mm,4mm,5mm and 7mm) between blade tip and fin side. To examine the piezoelectric fan flow phenomena with single fin, end-slotting plate-fin heat sink, middle-end slotting plate-fin heat sink. From the fin temperature gradient of infrared image, the empirical results showed the change of slope on the isothermal under the free convection and jet-like flow forced convection. The distance between blade tip and heat sink is getting closer, and the thermal resistance is less. Oppositely, with the distance increased, the thermal resistance is getting upward. Compare to the thermal resistance of non-piezoelectric fan and piezoelectric fan with single fin, it had been found the piezoelectric fan which used in this research can increases the thermal resistance up to four times, and it can be three to five times when using multi-fin. Besides, as piezoelectric fan works with multi-fin and set at the middle, the amplitude covers the most part of heat sink. That could push the air into the heat sink effectively for cooling. Moreover, comparing to the thermal resistances, it found the middle-end slotting plate-fin heat sink acquire the lower thermal resistance. Heat transfer resistance of the sink fin is designed with operating twin piezoelectric fans. The thermal image obtained by infrared thermography to investigate the t