亲水改性超薄平板热管传热性能  

Heat transfer performance of hydrophilic modified ultra-thin flat heat pipe

作　　者：杨茂飞 李金旺 周刘伟 YANG Maofei;LI Jinwang;ZHOU Liuwei(College of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,Jiangsu,China)

机构地区：[1]南京航空航天大学航天学院,江苏南京211106

出　　处：《化工进展》2023年第2期692-698,共7页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(11802125)。

摘　　要：高性能电子器件的发展需要厚度更薄、传热性能更高的传热装置。热管依靠内部工质相变潜热来传递热量,具有热导率高、均温效果好等特点,广泛应用于电子器件的散热。本文制作了厚度为0.6mm的超薄平板热管,热管壳体内部和铜丝网均作亲水改性处理,丝网加工出蒸汽通道来实现气液共面以降低流动阻力。搭建热管性能测试平台,在自然对流冷却条件下研究去离子水、乙醇两种工质和不同充液率对超薄平板热管传热性能的影响。结果表明:经过化学改性改善了管壳和铜丝网对去离子水的浸润性,同时提高了铜丝网的毛细力,亲水改性后去离子水热管热导率相比改性前提升了19.53%;两种工质填充的热管的最佳充液率都是1.0,在控制蒸发段最高温度小于80℃的情况下允许输入的最大功率为6W;去离子水填充的热管表现出更好的热性能。The development of high-performance electronic devices requires heat transfer devices with thinner thickness and higher heat transfer performance. Heat pipe relies on the latent heat of internal working medium phase change to transfer heat. It has the characteristics of high thermal conductivity and good temperature equalization effect. It is widely used in the heat dissipation of electronic devices. In this paper, an ultra-thin flat plate heat pipe with a thickness of 0.6mm was fabricated. The interior of the heat pipe shell and the copper wire mesh were hydrophilic modified. The steam channel was processed by the wire mesh to realize gas-liquid coplanar to reduce the flow resistance. A heat pipe performance test platform was built to study the effects of deionized water and ethanol and different liquid filling rates on the heat transfer performance of ultra-thin flat heat pipe under the condition of natural convection cooling.The results showed that the chemical modification improved the wettability of the shell and copper wire mesh to deionized water, and improved the capillary force of the copper wire mesh at the same time, after hydrophilic modification, the thermal conductivity of deionized water heat pipe increased by 19.53%compared with that before modification. The optimum liquid filling rate of the heat pipe filled with the two working fluids was 1.0, and the maximum power allowed to be input was 6W when the maximum temperature of the evaporation section was controlled to be less than 80℃. The heat pipe filled with deionized water showed better thermal performance.

关 键 词：超薄平板热管 改性 充液率 传热性能 传热 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]