Passive pool boiling enhancements offer attractive cooling possibilities to address the demand for effective thermal management in high powered electronic systems. Enhancements in pool boiling have been achieved through area augmentation, providing additional nucleation sites or by inducing liquid wettability changes. Graphene, a two-dimensional material, has garnered significant attention of researchers due to its excellent thermal properties. In this study, heat transfer surfaces are dip coated with an electrochemically generated solution consisting of graphene oxide (GO) and graphene and its pool boiling performance with distilled water at atmospheric pressure was obtained. The surfaces were characterized using X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The static contact angles of the engineered surfaces are measured. The underlying wettability mechanisms are supported by high speed imaging of the nucleating bubbles. A maximum Critical Heat Flux (CHF) of 182 W/cm~2 and a Heat Transfer Coefficient (HTC) of 96 kW/m~2°C was obtained with the thinnest coating which translated to an enhancement of 42% in CHF and 47% in HTC when compared to a plain uncoated surface.
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机译：被动池沸腾增强功能提供了有吸引力的冷却可能性，可满足大功率电子系统对有效热管理的需求。通过增加面积，提供额外的成核位置或通过引起液体可湿性变化，可以实现池沸腾的增强。石墨烯是一种二维材料，因其优异的热性能而受到了研究人员的广泛关注。在这项研究中，传热表面浸涂有由氧化石墨烯（GO）和石墨烯组成的电化学生成溶液，并在大气压下获得了其在蒸馏水中的沸腾沸腾性能。使用X射线衍射（XRD），傅立叶变换红外（FTIR）光谱，热重分析（TGA）和扫描电子显微镜（SEM）对表面进行表征。测量了工程表面的静态接触角。潜在的润湿机制由成核气泡的高速成像提供支持。使用最薄的涂层可获得最大的临界热通量（CHF）为182 W / cm〜2和传热系数（HTC）为96 kW / m〜2°C，这意味着CHF和47的提高了42％与纯平无涂层表面相比，HTC中的％。
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