Experimental investigation of thermal performance of the graphene-coated Al heat sink

To get rid of the heat better by improving the thermal performance of a heat sink, Al substrate was coated by a graphene layer with a different thickness by using a chemical spray method. The thickness of layers was changed by changing the spry time from 1000 to 5000 ms. Surface morphology was tested by using SPM to investigate the change that was occurred on the surface. In order to understand the performance of graphene-coated Al heat sink, a wind tunnel has been designed to investigate heat transfer coefficient, Nusselt number and thermal transmittance for each sample under turbulent flow condition with four values of Reynolds number. The results showed that graphene improves the thermal performance, and this performance is getting better with the thickness of graphene, up to critical thickness. (C) 2021 Elsevier Ltd. All rights reserved.