【作者】 陈欣；

【导师】 吴懿平；

【作者基本信息】 华中科技大学 ， 材料加工工程， 2015， 硕士

【摘要】 本课题以玻璃为外壳的重力热管为研究对象,研究了不同实验条件下玻璃热管的传热性能,并将其应用到LED散热领域,形成LED-重力热管散热系统,此外,对此系统进行了一系列的优化工作。主要的工作和结论如下:本文首先介绍了着重概括了重力热管的原理,并进行重力热管的设计。其包括选择和计算了重力热管的材料、工质和结构等参数,核算热管的强度及干涸极限、携带极限、沸腾极限;此外,基于热管热阻网络图,理论分析和计算了热管的内部热阻和外部热阻。其次,设计了重力热管加工工艺流程,包括热管毛管的加工、化学清洗、检漏、充液与灌装、封口等;并建立了重力热管灌装系统和检验系统。将设计好的重力热管按照上述工艺进行加工制造,并利用恒温水浴锅对重力热管进行性能检验。再者,搭建了实验测试平台,研究了不同热负荷、倾角、冷却方式等对对重力热管的瞬态性能、稳态性能、热阻等影响。结果表明重力热管启动时间大约在300s,热阻约为10K/W,其值都一定程度地受到上述参数的影响。最后,根据LED--重力热管系统的散热过程,优化热管的内部热阻和外部热阻,对管壳材料、壁厚、长度,重力热管结构,LED封装形式等进行了改进,结果表明这些参数的改进都不同程度的改善了系统的散热效果,重力热管内部热阻可降低到3K/W。更多还原

【Abstract】 In the paper, gravity heat pipe that wall was glass has been researched to figure out the heat-transfer performance of glass heat pipe under different experimental conditions, and applied to the field of LED heat dissipation to form LED- gravity heat pipe cooling system.In addition, this system has been implemented a series of optimization. The main work and conclusions are as follows:Firstly, this paper introduced the base theory of gravity heat pipe, and made a design of gravity heat pipe. The contents mainly include selection and calculation of wall material,the working medium, structure, etc, and calculation of strength, dryout limit, entrainment limit and boiling limit; in addition, theoretical analysis and calculation of the internal thermal resistance and external thermal resistance of the heat pipe based on heat pipe thermal resistance net.Secondly, this text designed the manufacture process of the gravity heat pipe in detail,include gross heat pipe processing, chemical cleaning, leak detection, liquid filling and filling, sealing, etc, and the establishment of a gravity heat pipe filling systems and inspection systems. The designed gravity heat pipe was got in accordance with the above manufactured process, and made the test performance with the use of constant temperature water-bath water.Furthermore, an experimental test platform was set up to study the gravity heat pipe transient performance, steady performance, thermal resistance and other effects of different thermal loads, dip, cooling style, etc. The results show that start time of gravity heat pipe is about 300 s, the thermal resistance is about 10K/ W, whose values are affected by the above parameters to some extent.Finally, according to the cooling process LED--gravity heat pipe system, the optimization was made to internal and external thermal resistance of the heat pipe, includeimprovements of wall material, wall thickness, gravity heat pipe length and structure, LED packages, ect, the results show that these parameters are varying degrees of improvements to improve the heat dissipation effect of the system, internal thermal resistance can be reduced to 3K/W.更多还原