超薄柔性热管蒸汽通道微压印成形及传热性能研究  

Heat Transfer Performance Evaluation of Ultrathin Flexible Heat Pipes with Vapor Channels Formed by Micro-imprint

作　　者：孙亚隆 汤勇[2,3] 梁富业 张仕伟 伍春霞[2] 帅茂 唐恒 SUN Yalong;TANG Yong;LIANG Fuye;ZHANG Shiwei;WU Chunxia;SHUAI Mao;TANG Heng(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001;School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640;College of Mechatronics and Control Engineering,Shenzhen University,Shenzhen 518000)

机构地区：[1]郑州大学机械与动力工程学院,郑州450001 [2]华南理工大学机械与汽车工程学院,广州510640 [3]深圳大学机电与控制工程学院,深圳518000

出　　处：《机械工程学报》2024年第14期329-337,共9页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(52105444,51905352)。

摘　　要：介绍PMMA壳体超薄柔性热管的制造设备与加工过程。分别采用分离式微压印模具加工的微柱子阵列和高温烧结多层铜丝网作为蒸汽通道和吸液芯,制造厚度0.67mm的超薄柔性热管。研究微压印温度、压力和压印时间对微柱子成形的影响。介绍超薄柔性热管传热性能试验台设计与试验方法,试验结果表明最佳充液量为350~400μL,最高热导率达到924.1 W/(m·K);当超薄柔性热管弯曲90°时,其热导率仍为铜热导率的1.16倍。综上所述,利用微压印成形制作的PMMA壳体超薄柔性热管具有结构灵活、成本低廉以及低蒸汽阻力的优点,是解决柔性可穿戴式电子设备散热难题的理想方案。The manufacturing equipment and fabrication process of ultrathin flexible heat pipe(UFHP)with PMMA casings are introduced in this study.A micro-column array fabricated by a separate micro-imprint mold and a high-temperature sintered multilayer copper mesh are used as vapor channel and wick,respectively,and UFHPs with a thickness of 0.67mm is fabricated.The effects of micro-imprint temperature,pressure,and dwell time on the forming of micro-pillars were studied.The test devices and the experimental methods of the heat transfer performance of UFHPs are introduced.The experimental results showed that the optimal liquid filling amount is 350-400μL and the highest thermal conductivity reached 924.1 W/(m•K).The thermal conductivity of the UFHP is still 1.16 times that of copper with a bending angle of 90°.In summary,the UFHPs with PMMA casings fabricated by micro-imprint have the advantages of flexible structure,low cost,and low vapor flow resistance,and are an ideal solution to the heat dissipation problem of flexible wearable electronic devices.

关 键 词：柔性热管 超薄 微压印 蒸汽通道 聚合物 

分 类 号：TK124[动力工程及工程热物理—工程热物理]