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Experimental and numerical investigation on the performance of carbon-based nanoenhanced phase change materials for thermal management applications

机译：用于热管理应用的碳基纳米增强相变材料性能的实验和数值研究

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Phase change material (PCM)-based thermal management is one of the most promising approaches for the thermal management of energy conversion devices such as electric vehicle batteries and photovoltaic cells. However, most of the PCM present inherently low thermal conductivities, which result in deficient temperature control capacity in these applications. Several types of carbon-based nanoparticle have been explored to enhance the thermal conductivity of pure PCM. Despite the significant improvements in their thermal conductivity, the heat transfer in the liquid phase nano-enhanced PCM is expected to decrease due to the presence of the nano particles matrices. In this study, three types of carbon-based nanostructures are embedded in a paraffin to investigate their heat transfer performance for thermal management applications. The experimental results indicate that the addition of nanoadditives can improve the heat conduction of solid phase paraffin with slight latent heat degradation. But it also drastically increases the dynamic viscosity of composites which suppresses the natural convection heat transfer in the melted PCM. The thermal behavior of nanocomposites during the melting process is experimentally and numerically examined. Results reveal that adding carbon nanofibers and graphene platelets deteriorate the thermal performance of the pure paraffin. However, an enhanced thermal response observed when graphite-based nanocomposites at 7.5 and 10 wt% are used due to their 620% and 1100% solid phase thermal conductivity enhancement, respectively. The results of the current work suggest that there is a trade-off between the thermal conductivity enhancement and natural convection suppression of nanocomposites that can be used in the optimal design of PCM-based thermal management systems.
机译：基于相变材料（PCM）的热管理是用于能量转换设备（例如，电动汽车电池和光伏电池）的热管理的最有前途的方法之一。但是，大多数PCM固有地具有较低的热导率，这导致这些应用中的温度控制能力不足。已经探索了几种类型的碳基纳米颗粒以增强纯PCM的导热性。尽管它们的导热率有了显着改善，但是由于存在纳米颗粒基质，预计液相纳米增强PCM中的传热会减少。在这项研究中，将三种类型的碳基纳米结构嵌入石蜡中，以研究其在热管理应用中的传热性能。实验结果表明，添加纳米添加剂可以改善固相石蜡的热传导，并具有轻微的潜在热降解。但这也大大增加了复合材料的动态粘度，从而抑制了熔融PCM中自然对流传热。纳米复合材料在熔融过程中的热行为进行了实验和数值研究。结果表明，添加碳纳米纤维和石墨烯血小板会降低纯石蜡的热性能。但是，当分别使用7.5和10 wt％的石墨基纳米复合材料时，由于它们的固相热导率提高了620％和1100％，因此观察到了增强的热响应。当前工作的结果表明，可以在基于PCM的热管理系统的最佳设计中使用的纳米复合材料的热导率增强与自然对流抑制之间需要权衡取舍。

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