Investigation of heat transfer enhancement of vertical heat sinks by piezoelectric fan

2011 ◽  
Author(s):  
Jin-Cherng Shyu ◽  
Jhih-Zong Syu
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Heat Sinks ◽  
Transfer Enhancement ◽  
Vertical Heat

THERMAL PERFORMANCE OF VERTICAL HEAT SINKS WITH DIFFERENT PIEZOFAN ARRANGEMENTS

2013 ◽  
Vol 37 (3) ◽  
pp. 895-903 ◽  
Author(s):  
Jin-Cherng Shyu ◽  
Jhih-Zong Syu
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Thermal Performance ◽  
Heat Sink ◽  
Heat Sinks ◽  
Transfer Enhancement ◽  
Pin Fin ◽  
Enhancement Factors ◽  
Vertical Heat

This study examines various effects on the heat transfer enhancement of several vertical heat sinks with a running piezofan. Both plate-fin heat sink and pin-fin heat sink having a 10-mm-high or 30-mm-high fin array were tested with either a vertical or a horizontal piezofan. Results show that the piezofan tip located at x/L = 0.5 usually yielded the highest heat transfer enhancement. Besides, heat transfer enhancement factors ranged from 1.2 to 2.4 for the present 10-mm-high plate-fin heat sink, and from 1.1 to 2.6 for the 10-mm-high pin-fin heat sink.

Heat Transfer Enhancement of Vertical Heat Sinks with a Piezofan

2013 ◽  
Vol 284-287 ◽  
pp. 773-777
Author(s):  
Jin Cherng Shyu ◽  
Jhih Zong Syu
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Heat Transfer Enhancement ◽  
Heat Sink ◽  
High Heat ◽  
Heat Sinks ◽  
Transfer Enhancement ◽  
Vertical Heat ◽  
Pin Fins

This study examines several effects, including the piezofan positions, and piezofan arrangements, as well as piezofan height, on the heat transfer enhancement of two typical types of vertical heat sink. Either 30-mm-high or 10-mm-high heat sink having 11 plate-fins or 100 square pin-fins is tested with a running piezofan. The piezofan having Mylar blade is either vertically or horizontally placed above the heat sinks vibrating with resonant frequency of 31 Hz and tip mean-to-peak amplitude of 7.2 mm. The heat transfer coefficient is measured at five different fan locations with fan heights of 12 mm and 16 mm. Results show that the piezofan located at x/L = 0.5 usually performs the highest heat transfer enhancement for a given heat sink, while piezofan located at x/L = 1 usually shows the worst heat transfer enhancement. Depending on the fan arrangements and positions, heat transfer coefficient of the present 10-mm-high plate-fin heat sink shows 1.2 – 2.4 times higher than that under natural convection, while the enhancement factor ranges from 1.1 to 2.6 for 10-mm-high pin-fin heat sink.

Heat transfer enhancement in microchannel heat sinks using nanofluids

2012 ◽  
Vol 55 (9-10) ◽  
pp. 2559-2570 ◽  
Author(s):  
Tu-Chieh Hung ◽  
Wei-Mon Yan ◽  
Xiao-Dong Wang ◽  
Chun-Yen Chang
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Heat Sinks ◽  
Transfer Enhancement ◽  
Microchannel Heat Sinks
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