Graphene-coated sintered porous copper surfaces for boiling heat transfer enhancement

Ebrahimpour Ahmadi, Vahid and Khaksaran, Mohammad Hadi and Apak, Ahmet Muhtar and Apak, Alper and Parlak, Murat and Tastan, Umur and Kaya, İsmet İnönü and Sadaghiani, Abdolali Khalili and Koşar, Ali (2022) Graphene-coated sintered porous copper surfaces for boiling heat transfer enhancement. Carbon Trends, 8 . ISSN 2667-0569

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Phase change heat transfer via pool boiling is an effective and low-cost method for applications such as electronics cooling and noticeably depends on bubble dynamics behavior. Porous copper surfaces provide a larger heat transfer area and more nucleation sites at the liquid-surface interface and improve heat transfer compared to bare copper surfaces. In addition, the capability of copper foams in surface replenishment and capillary wicking prevents surface dry-out at elevated heat fluxes. Graphene has recently attracted increasing attention in thermal management applications due to its exceptional thermal and mechanical properties. This study focuses on the effects of foam thickness (i.e., 0.5 mm, 1 mm, 1.5 mm, and 2 mm) and graphene-coating on pool boiling heat transfer on sintered porous surfaces by combining the porous structure with graphene coating. According to the obtained results, thinner samples (i.e., 0.5 mm and 1 mm) exhibited a better performance due to their lower vapor resistance and efficient liquid supply compared to thicker samples (i.e., 1.5 mm and 2 mm). The optimum surface configuration depends on the operating condition. Graphene-coating affects bubble dynamics and leads to further enhancement in boiling heat transfer by increasing the thermal conductivity and wicking rate. The maximum heat transfer enhancement was recorded for the thickness of 0.5 mm on graphene-coated sintered porous copper surfaces as 161% compared to the bare copper surface, while the maximum enhancement with graphene coating was 24% relative to the porous copper surface of the same thickness. Thus, the contribution of graphene coating on sintered porous copper surfaces to further boiling heat transfer enhancement was proven in this study.
Item Type: Article
Uncontrolled Keywords: Graphene coating; Heat transfer enhancement; Pool boiling; Sintered porous copper structure
Divisions: Faculty of Engineering and Natural Sciences
Sabancı University Nanotechnology Research and Application Center
Depositing User: İsmet İnönü Kaya
Date Deposited: 22 Aug 2022 20:47
Last Modified: 22 Aug 2022 20:47

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