ABSTRACT

The continued depreciation of electronic components presents severe challenges for thermal management. Regarding this issue, the current experimental study targets to propose and assess two passive cooling (using a heat sink and rough surface) and two active cooling (air and water cooling) for improving the cooling efficiency of aluminum heat sink heat pipes (HSHPs). In roughening process, the fins are chemically etched using a lab-made simple, cost-efficient, and environmental-friendly method to achieve better cooling performance synergistically. Scanning electron microscopy and atomic force microscopy characterizations are executed to investigate the heat sink surfaces’ micro/nano roughened structure. Current results and related comparative studies of the three cooling modules (typical, liquid-based, and liquid-based micro/nano roughened HSHPs) are presented as well, where effects of constant/intermittent heat fluxes (4000–12000 W/m²) and the volume flow rates of testing fluid on heat transfer characteristics, thermal resistance, and temperature behavior are disclosed. Based on findings, at a constant heat flux, roughening the HSHP fins led to an enhancement in cooling through fins and a reduction in cooling through the water. Moreover, it is found that the modified HSHP without testing fluid and with water at volume flow rates of 100 and 200 ml/min decreases the thermal resistance by 11.9, 13.7, and 3.6%, in order, compared with the typical HSHP.

摘要

电子元件的持续贬值对热管理提出了严峻挑战。关于这个问题，目前的实验研究旨在提出和评估两种被动冷却（使用散热器和粗糙表面）和两种主动冷却（空气和水冷）以提高铝散热器热管（HSHP）的冷却效率。在粗化过程中，使用实验室制造的简单、经济且环保的方法对翅片进行化学蚀刻，以协同实现更好的冷却性能。执行扫描电子显微镜和原子力显微镜表征以研究散热器表面的微/纳米粗糙结构。三种冷却模块（典型的，液基的，² ) 和测试流体的体积流量对传热特性、热阻和温度行为的影响。根据研究结果，在恒定的热通量下，粗糙化 HSHP 翅片会导致翅片冷却增强并减少水冷却。此外，发现与典型的 HSHP 相比，未测试流体和体积流量为 100 和 200 ml/min 的水的改进 HSHP 的热阻依次降低了 11.9、13.7 和 3.6%。