Experimental investigation of orientation and geometry effect on additive manufactured aluminium LED heat sinks under natural convection

Tucker, Robert, Khatamifar, Mehdi, Lin, Wenxian, and McDonald, Kyle (2021) Experimental investigation of orientation and geometry effect on additive manufactured aluminium LED heat sinks under natural convection. Thermal Science and Engineering Progress, 23. 100918.

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Abstract

The continued adaptation of light-emitting diodes (LEDs) presents challenges for heat dissipation. LEDs are considered to be high power density devices, as such effective thermal management is imperative for extended usage. In this study, new design considerations such as adapting 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 incorporated into heat sinks to assist convection. The heat sinks were manufactured out of aluminium alloy (AlSi10Mg) using the selective laser melting (SLM) method. The effects of orientation on the heat transfer of different heat sink geometries were experimentally studied under natural convection conditions. The performance of six different geometries with 6, 8 and 10 long fins (6LF, 8LF and 10LF) with and without middle fins were evaluated under three different heat flux conditions (471.57 , 943.14 and 1257.52 ) for 10 different orientation angles (0-90). The higher fin density heat sinks are found to have lower orientation dependency. The convective fluid flow of the higher fin density geometries is significantly hindered by the overlapping of thermal boundary layers. The increase in the Rayleigh number has the most significant effect on the 6LF heat sink. The overall Nusselt number correlations for the 6LF, 8LF and 10LF heat sinks with short fins are and , respectively. Removing short fins improved heat transfer rate for all heat sinks.

Item ID: 67700
Item Type: Article (Research - C1)
ISSN: 2451-9049
Keywords: Radial heat sink; light-emitting diode(LED); perforation; additive manufacturing; natural convection
Copyright Information: © 2021 Elsevier Ltd. All rights reserved.
Date Deposited: 19 Apr 2021 00:14
FoR Codes: 40 ENGINEERING > 4012 Fluid mechanics and thermal engineering > 401205 Experimental methods in fluid flow, heat and mass transfer @ 70%
40 ENGINEERING > 4014 Manufacturing engineering > 401401 Additive manufacturing @ 30%
SEO Codes: 17 ENERGY > 1701 Energy efficiency > 170102 Industrial energy efficiency @ 100%
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