汽液通道结构对超薄热管性能的影响分析  

Influence of Vapor-Liquid Passage Structure on the Performance of an Ultra-Thin Heat Pipe

作　　者：甘云华[1] 熊瑭 罗奇梁 梁嘉林 董道伟 李勇[3] Gan Yunhua;Xiong Tang;Luo Qiliang;Liang Jialin;Dong Daowei;Li Yong(School of Electric Power Engineering,South China University of Technology,Guangzhou 510640,China;Jiangxi Naile Copper Co.,Ltd.,Yingtan 335211,China;School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学电力学院,广州510640 [2]江西耐乐铜业有限公司,鹰潭335211 [3]华南理工大学机械与汽车工程学院,广州510640

出　　处：《天津大学学报（自然科学与工程技术版）》2022年第9期965-972,共8页Journal of Tianjin University：Science and Technology

基　　金：江西省引进类高层次创新创业团队项目(jxsq2019105012);广东省基础和应用基础研究基金资助项目(2020B1515020040);国家自然科学基金资助项目(51776077);内燃机燃烧学国家重点实验室开放基金资助项目(K2021-01).

摘　　要：随着微电子技术和大数据产业的飞速发展,电子元器件的高性能化、微型化、高集成化已成为当下电子设备发展的主流趋势.电子芯片的高功率及小尺寸导致热流密度大幅增加,散热问题越发严峻.超薄热管是解决当前电子设备在狭小空间内高热流密度散热问题的理想方案,蒸汽通道与液体通道(吸液芯)的匹配对提升超薄热管传热性能有重要影响.根据复合丝网型超薄热管的几何结构建立三维对称数值模型,基于前期团队工作的实验结果验证了模型的准确性,对不同吸液芯高度的热管进行了数值模拟,重点分析了稳态工况下汽液通道比对超薄热管内汽液流动特性以及传热性能的影响.结果表明:在吸液芯高度一定时,汽液通道比越大,蒸汽最大速度以及压降均减小,且当汽液通道比在低于80%时变化更剧烈.此外,随着汽液通道比的增大,热管整体温度和热阻均呈现出先减小再增大的趋势.因此在不同的吸液芯高度下,均对应着一个最佳通道比使得热阻最小.当吸液芯高度分别为0.3 mm、0.4 mm、0.5 mm和0.6 mm时,最佳通道比分别为135%、93%、71%和63%,热阻分别为0.68 K/W、0.47 K/W、0.36 K/W以及0.30 K/W,热阻相比于最大热阻均减小了40%以上.汽液通道比对热管性能影响较大,因此选择合适的汽液通道比对超薄热管的结构设计优化有一定的参考价值.With the rapid development of microelectronics technology and the big data industry,high performance,miniaturization,and high integration of electronic components have become the mainstream trend in current electronic equipment development.The high power and small size of electronic chips have led to a substantial increase in heat flux.Therefore,the heat dissipation problem has become more severe.An ultra-thin heat pipe(UTHP)can solve the high heat flux density of current electronic equipment in a small space.The matching of the vapor passage area and liquid passage(wick)area helps improve the heat transfer performance of UTHPs.A three-dimensional symmetrical numerical model was established based on the geometric structure.After comparing and verifying experimental data,UTHPs with various wick heights were numerically simulated.Then,the effect of vapor-liquid passage ratio on the vapor flow and heat transfer performance in the heat pipe under steady state was analyzed.The results show that the vapor-liquid passage ratio is closely related to the internal vapor characteristics and thermal performance of UTHPs.When the wick height is constant,the larger the vapor-liquid passage ratio,the maximum vapor velocity and pressure drop decrease.When the vapor-liquid passage ratio is within 80%,the vapor velocity and pressure drop change more dramatic.Additionally,with the increase in the vapor-liquid passage ratio,the overall temperature and thermal resistance of the heat pipe at first decrease and then increase.At various wick heights,an optimal passage ratio is maintained to minimize the thermal resistance of the heat pipe.When the wick height is 0.3,0.4,0.5,and 0.6 mm,the optimal passage ratio is 135%,93%,71%,and 63%,respectively;the thermal resistance is 0.68 K/W,0.47 K/W,0.36 K/W,and 0.30 K/W respectively.Compared with the maximum thermal resistance,the corresponding thermal resistance is reduced by more than 40%.The vapor-liquid passage ratio has a significant impact on the heat pipe performance.Thus,an appropriate p

关 键 词：超薄热管 数值分析 传热 相变 汽液通道比 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]