Experimental investigation of saturated pool boiling on a porous copper-graphene coating surface with microgrooves

Fei, Guochao and Du, Yanping (2025) Experimental investigation of saturated pool boiling on a porous copper-graphene coating surface with microgrooves. Journal of Physics: Conference Series, 2932 (1): 012018. ISSN 1742-6588

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Abstract

In this study, a microgroove porous copper-graphene composite coating was fabricated on a copper substrate utilizing a combination of salt template sintering and mechanical cutting. The pool boiling heat transfer performance of the modified surface was investigated using water as the working fluid at atmospheric pressure. The experimental results demonstrated that the integration of microgrooves with a porous copper-graphene coating substantially improved the pool boiling heat transfer performance. Among the tested configurations with 4, 6, 10, 18, and 24 microgrooves, the surface with 18 grooves exhibited the most superior performance, marked by an 82% reduction in the onset of nucleate boiling (ONB), a 189% increase in the critical heat flux (CHF), and a 140% enhancement in the heat transfer coefficient (HTC) compared to a smooth copper surface. Further analysis of bubble dynamics revealed that the microgroove porous copper-graphene coating promotes heat transfer by creating a gas-liquid separation structure at low heat flux and by extending the triple-phase contact line at higher heat flux, both of which contribute synergistically to the enhanced boiling performance.