International Scientific Journal


Electrical batteries, mobile phones, central processing units of computing systems, and scientific instruments lose life due to improper heat transfer. Thermal management enables these electronics to run smoothly. This experiment measures heat sink temperature fluctuations during heating and cooling using lateral fins coated with graphene and carbon CNT. The study examined 15 W, 25 W, 35 W, and 45 W heat inputs to record the time to reach 40°C, 50°C, and 60°C. Regardless of the coating material used in the heat sink, the time taken by the heat sinks to attain 60°C was more than 3000 seconds. Heat input reduced the time to below 3000 seconds. Heat sinks dissipated heat until 32°C during cooling. Infrared spectroscopy showed fins and heat sinks’ energy retention. Convective heat transfer cooled the middle row of fins, and coated and uncoated heat sinks were evaluated for enhancement ratio. Coating the heat sink with graphene resulted in an enhancement in heat transfer by 1.15. While heating at 15 W, the CNT coated heat sink exhibited a 1.9 enhancement ratio. The graphene-coated heat sink had an enhancement ratio for 25 W, 35 W, and 45 W heat inputs. The study found that operating temperature, input energy, and nanocoatings affect heat sink performance. This work can help optimise heat transfer from the heat sink to the atmosphere by determining nanocoating thickness. Mixed-material coating studies can disclose heat sink performance.
PAPER REVISED: 2023-09-14
PAPER ACCEPTED: 2023-09-21
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THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 1, PAGES [293 - 305]
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© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence