The Influence of Geometry Variation and Heat Sink Angle on its Thermal Performance
Conference Contribution ResearchOnline@JCUAbstract
Light-emitting diodes (LEDs) are becoming substantially more popular than traditional lighting methods. LED lights are high power density devices that need thermal management systems to extend their useful life. This paper presents an experimental study on radial aluminum heat sink fabricated by metal additive manufacturing process operating under natural convection conditions. New design considerations such as adapting the middle fin, fin height gradient towards the centre of the heat sink, along with fin perforations and a spiral cut out of the central pillar have been used to improve the thermal performance of the heat sink. For different fin numbers, the effect of the orientation on the natural heat transfer was studied. The performance of three different geometries with 6, 8 and 10 long fins (6LF, 8LF and 10LF) were evaluated under three different heat flux conditions (471.57W/m2, 943.14W/m2 and 1257.52W/m2) for 10 different orientation angles from 0 to 90. It was found that the orientation has a weaker effect on high-density heat sinks than on low ones due to the hindered convective fluid flow by the overlapping of thermal boundary layers. The Rayleigh number was showed to have a significant effect on heat transfer and this effect was the most prominent for the 6LF heat sink. The overall Nusselt number correlations to predict the heat transfer as a function of the Rayleigh number for the 6LF, 8LF and 10LF heat sinks are 0.2748Ra^0.3425, 0.3868Ra^0.2747 and 0.3317Ra^0.2708, respectively.
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12AHMTC: 12th Australasian Heat and Mass Transfer Conference
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8
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Sydney, NSW, Australia
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University of Sydney
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Sydney, NSW, Australia
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