Chang Chao, Han Zhaoyang, He Xiaoyu, Wang Zongyu, Ji Yulong
Institute of Marine Engineering and Thermal Science, Marine Engineering College, Dalian Maritime University, Dalian, 116026, People's Republic of China.
Sci Rep. 2021 Apr 15;11(1):8255. doi: 10.1038/s41598-021-87798-4.
As the electronic technology becomes increasingly integrated and miniaturized, thermal management has become a major challenge for electronic device applications. A heat pipe is a highly efficient two-phase heat transfer device. Due to its simple structure, high thermal conductivity and good temperature uniformity, it has been used in many different industrial fields. A novel aluminum flat heat pipe, with micro-grooves, has in the present work been designed and fabricated by using a 3D printing technology. Aluminum powder was used as a raw material, which was selectively melted and solidified to form the shape of the heat pipe. The sintered aluminum powder increased the roughness of the inner surface of the heat pipe, and the designed micro-grooves further enhanced the capillary forces induced by the wick structure. The wettability, for the working fluid (acetone), was excellent and the capillary forces were sufficient for the working fluid to flow back in the pipe. The effects of working fluid filling ratio, on the heat transfer performance of the heat pipe, was also investigated. It was shown that a filling ratio of 10% gave the best heat transfer performance with the lowest thermal resistance. The 3D-printed flat heat pipe was, therefore, also tested for the thermal management of a LED. The temperature of the LED could be kept within 40 °C and its service life became prolonged.
随着电子技术日益集成化和小型化，热管理已成为电子设备应用中的一项重大挑战。热管是一种高效的两相传热装置。由于其结构简单、热导率高且温度均匀性好，已被应用于许多不同的工业领域。在本工作中，采用三维打印技术设计并制造了一种带有微槽的新型铝制扁平热管。以铝粉为原料，通过选择性熔化和凝固形成热管形状。烧结后的铝粉增加了热管内表面的粗糙度，而设计的微槽进一步增强了由毛细结构产生的毛细力。对于工作流体（丙酮），润湿性良好，毛细力足以使工作流体在管内回流。还研究了工作流体填充率对热管传热性能的影响。结果表明，填充率为10%时传热性能最佳，热阻最低。因此，还对三维打印的扁平热管进行了LED热管理测试。LED的温度可保持在40℃以内，其使用寿命得以延长。
