Effective thermal management is essential for guaranteeing the working efficiency and safety of several industrial devices. Due to its excellent heat absorption characteristic, microencapsulated phase change material (MEPCM) is promising for thermal management system. However, the drawback of MEPCM's low thermal conductivity seriously hinders the heat dissipation rate from heat sink. Based on their high thermal conductivity and effective interconnected anisotropic heat transfer channels, metal fibers could be inserted into MEPCM to ameliorate its corresponding heat transfer capability. In the current work, novel stacked 2D metal fibers are designed and coupled with MEPCM in order to improve the thermal performance of heat sink. Based on the numerically reconstructed metal fibers, the thermal performance of heat sink assembly filled with MEPCM-metal fiber composite is investigated through pore-scale lattice Boltzmann modelling. When the latent heat of MEPCM is available, the heat sink assembly using anisotropic stacked 2D metal fibers has a less temperature rise compared with that using random metal fibers because of the consolidated heat transfer rate in a desired vertical direction. Furthermore, for an intermittent working heat sink, the MEPCM-stacked 2D metal fiber composite with high anisotropic degree exhibits more obvious advantage on its thermal management owing to the periodically recharged latent heat for further heat absorption.

中文翻译：

---

堆叠式二维金属纤维-PCM复合材料散热器的孔隙尺度传热


有效的热管理对于保证多种工业设备的工作效率和安全至关重要。由于其优异的吸热特性，微封装相变材料（MEPCM）在热管理系统中具有广阔的应用前景。然而，MEPCM导热系数低的缺点严重阻碍了散热器的散热速率。基于金属纤维的高导热性和有效互连的各向异性传热通道，可以将金属纤维插入MEPCM中以改善其相应的传热能力。在当前的工作中，设计了新型堆叠式二维金属纤维并将其与MEPCM结合以提高散热器的热性能。基于数值重建的金属纤维，通过孔尺度晶格玻尔兹曼建模研究了填充MEPCM-金属纤维复合材料的散热器组件的热性能。当MEPCM的潜热可用时，使用各向异性堆叠的二维金属纤维的散热器组件与使用随机金属纤维的散热器组件相比，由于在期望的垂直方向上的强化传热率而具有较小的温升。此外，对于间歇工作的散热器，高各向异性程度的MEPCM堆叠二维金属纤维复合材料由于周期性地补充潜热以进一步吸收热量，因此在热管理方面表现出更明显的优势。