The Influence of Geometry Variation and Heat Sink Angle on its Thermal Performance

Tucker, Robert, Khatamifar, Mehdi, Lin, Wenxian, and McDonald, Kyle (2022) The Influence of Geometry Variation and Heat Sink Angle on its Thermal Performance. In: [Presented at the 12th Australasian Heat and Mass Transfer Conference] (8) From: 12AHMTC: 12th Australasian Heat and Mass Transfer Conference, 30 June – 1 July 2022, Sydney, NSW, Australia.

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Abstract

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.

Item ID: 75429
Item Type: Conference Item (Presentation)
Keywords: Heat transfer; LED; orientation; additive manufactured
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Date Deposited: 15 Sep 2022 01:06
FoR Codes: 40 ENGINEERING > 4012 Fluid mechanics and thermal engineering > 401205 Experimental methods in fluid flow, heat and mass transfer @ 90%
40 ENGINEERING > 4014 Manufacturing engineering > 401401 Additive manufacturing @ 10%
SEO Codes: 17 ENERGY > 1701 Energy efficiency > 170102 Industrial energy efficiency @ 100%
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