Zhou Zhihao, Wang Xu, Zhou Yongmin
College of Materials Science and Engineering, Nanjing Tech University, South Puzhu Road No. 30, Nanjing 211816, China.
Materials (Basel). 2023 Jun 20;16(12):4482. doi: 10.3390/ma16124482.
As optoelectronic products continue to advance rapidly, the need for effective heat dissipation has become increasingly crucial due to the emphasis on miniaturization and high integration. The vapor chamber is widely used for cooling electronic systems as a passive liquid-gas two-phase high-efficiency heat exchange device. In this paper, we designed and manufactured a new kind of vapor chamber using cotton yarn as the wick material, combined with a fractal pattern layout of leaf veins. A comprehensive investigation was conducted to analyze the performance of the vapor chamber under natural convection circumstances. SEM showed that many tiny pores and capillaries were formed between the cotton yarn fibers, which are very suitable as the wick material of the vapor chamber. Additionally, experimental findings demonstrated the favorable flow and heat transfer characteristics of the cotton yarn wick within the vapor chamber, which makes the vapor chamber have significant heat dissipation capability, compared to the other two vapor chambers; this vapor chamber has a thermal resistance of only 0.43 °C/W at a thermal load of 8.7 W. In addition, the vapor chamber showed good antigravity capability, and its performance did not show significant changes between horizontal and vertical positions; the maximum difference in thermal resistance at four tilt angles is only 0.06 °C/W. This paper also studied the influence of vacuum degree and filling amount on the performance of the vapor chamber. These findings indicate that the proposed vapor chamber provides a promising thermal management solution for some mobile electronic devices and provides a new idea for selecting wick materials for vapor chambers.
随着光电子产品的迅速发展，由于对小型化和高集成度的重视，有效散热的需求变得越来越关键。汽相室作为一种被动式液-气两相高效热交换装置，被广泛用于冷却电子系统。在本文中，我们设计并制造了一种新型汽相室，它以棉纱作为芯体材料，并结合了叶脉的分形图案布局。我们进行了全面的研究，以分析该汽相室在自然对流情况下的性能。扫描电子显微镜显示，棉纱纤维之间形成了许多微小的孔隙和毛细管，这非常适合作为汽相室的芯体材料。此外，实验结果表明，棉纱芯体在汽相室内具有良好的流动和传热特性，这使得该汽相室具有显著的散热能力，与其他两个汽相室相比，在8.7W的热负荷下，该汽相室的热阻仅为0.43℃/W。此外，该汽相室表现出良好的抗重力能力，其性能在水平和垂直位置之间没有显著变化；四个倾斜角度下热阻的最大差值仅为0.06℃/W。本文还研究了真空度和填充量对汽相室性能的影响。这些研究结果表明，所提出的汽相室为一些移动电子设备提供了一种有前景的热管理解决方案，并为汽相室芯体材料的选择提供了新的思路。
