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多支管并联的分离型热管回路传热特性实验研究
罗云,王文,胡院林,余欣,叶成
0
(上海交通大学机械与动力工程学院;上海核工程研究设计院)
摘要:
基于分离式重力热管在冷却50 ℃左右水池中的应用背景,本文实验研究了7根并联支管换热形成的分离型热管回路,主要研究以R134a为热管工质的热管散热能力以及充液率对热管系统工作性能的影响,得到实验的最佳充液率为42.3%。在此基础上对比分析了并联各支管的流动与传热性能差异,结果表明,水池加热功率在780~2 560 W的实验范围内时,水池温度、管内蒸发温度和管内传热系数均随水池加热功率的增加而增加;并联蒸发管和冷凝管的流量分配均出现不均匀现象,且并联各支管间传热性能存在一定的差异性,其中在充液率为42.3%、水池加热功率为1 680 W时,蒸发段支管1的最大传热系数是支管7的1.68倍。
关键词:  分离型热管  传热系数  并联支管  充液率
DOI:
投稿时间:2018-08-06修订日期:2018-10-11
基金项目:科技部重大专项项目(2015ZX06004002)资助。
Experimental Study on Heat Transfer Characteristics of Separated Heat Pipe Loop with Multiparallel Branches
Luo Yun,Wang Wen,Hu Yuanlin,Yu Xin,Ye Cheng
(College of Mechanic and Power Engineer, Shanghai Jiao Tong University;Shanghai Nuclear Engineering Research & Design Institute)
Abstract:
An outline of the working principle of separated heat pipe loop and its application potential in refrigeration and air conditioning area has been provided herein. A heat pipe loop with seven parallel branches was investigated experimentally for the performance of fuel pool cooling, along with the impact of the liquid filling ratio in the heat pipe loop with R134a as working fluid. Experimental results showed an optimal liquid filling ratio in the heat pipe loop of approximately 42.3%; accordingly, the pool temperature, evaporation temperature in the tube, and heat transfer coefficient increased with a higher temperature inside the water tank within the heating power range of 780–2 560 W. The flow distribution of branches in both evaporation and condensation sections was uneven with a certain difference in heat transfer performance among the parallel branches. The largest heat transfer coefficient was found in the No.1 branch pipe of the evaporation section, which was 1.68 times that of the No.7, with 42.3% liquid filling ratio and 1 680 W heating power.
Key words:  separated heat pipe  coefficient of heat transfer  parallel branches  filling ratio

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