Investigating the performance of conventional and hydrophobic surface heat sink in managing thermal challenges of high heat generating components

Babar, H, Wu, H and Zhang, W ORCID: https://orcid.org/0000-0002-3053-2388, 2023. Investigating the performance of conventional and hydrophobic surface heat sink in managing thermal challenges of high heat generating components. International Journal of Heat and Mass Transfer, 216: 124604. ISSN 0017-9310

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Abstract

In the pursuit of optimizing heat dissipation and improving performance in electronic devices, liquid-cooled heat sinks have garnered significant interest due to their potential to improve heat transfer efficiency. Presented study set out to assess the effectiveness of straight channel heat sinks as a thermal solution for high heat generating electronics components, while also investigating the impact of applying a hydrophobic coating on their performance. A series of tests were conducted at different heating powers (50W-250 W) and flow rates (200–950 ml/min), while also considering different orientations and directions of flow. The investigation focused on analysing critical aspects such as heat transfer performance, wall temperature variations, thermal resistance, and pressure drop characteristics of straight channel heat sinks with conventional and hydrophobic-coated surfaces. The results showed that the Nusselt number increased with higher Reynolds numbers and heating powers, indicating improved heat transfer efficiency. However, the hydrophobic coating on the heat sink surface led to a reduction in the Nusselt number due to the formation and retention of bubbles, hindering heat transfer. The maximum average reduction of 20.85% in Nusselt number was noticed at 100 W for the vertically positioned hydrophobic-coated heat sink with downward flow compared to conventional surface (CS) heat sink. Additionally, the findings revealed that pressure drop is influenced by Reynolds number and the presence of bubbles, with gravity playing a role in reducing pressure drop in certain orientations. A hydrophobic coating shows a small decrease in pressure drop, but bubble formation limits its effectiveness to some extent. Comparisons also indicated that the highest average decrease in pressure drop about 11.92% was observed for the same configuration, vertically positioned hydrophobic heat sink with downward flow, at 50 W. Moreover, the study's findings have broader implications beyond electronics. Heat sinks are widely employed in various industries, including automotive, aerospace, renewable energy systems, and industrial processes.

Item Type:	Journal article
Publication Title:	International Journal of Heat and Mass Transfer
Creators:	Babar, H., Wu, H. and Zhang, W.
Publisher:	Elsevier BV
Date:	December 2023
Volume:	216
ISSN:	0017-9310
Identifiers:	Number Type 10.1016/j.ijheatmasstransfer.2023.124604 DOI 1793091 Other
Rights:	© 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Divisions:	Schools > School of Science and Technology
Record created by:	Laura Ward
Date Added:	21 Aug 2023 12:51
Last Modified:	21 Aug 2023 12:51
URI:	https://irep.ntu.ac.uk/id/eprint/49600

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