正火预处理对脉动热管启动时间的影响  

Influences of normalizing pretreatment on the start-up time of pulsating heat pipe

作　　者：王瑞祥[1] 闫梦霏 徐荣吉[1] 邢美波[1] WANG Ruixiang;YAN Mengfei;XU Rongji;XING Meibo(Beijing Engineering Research Centre of Sustainable Energy and Buildings, Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学北京市建筑能源综合高效综合利用工程技术研究中心,北京100044

出　　处：《化工进展》2018年第6期2116-2124,共9页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金青年基金(51506004);北京市自然科学基金(3162009);北京市创新能力提升计划(TSJHG201310016011)项目

摘　　要：启动时间是脉动热管的重要性能指标,与管内壁的表面结构及工质润湿性密切相关。本文分别采用氧乙炔、钎焊炉正火与马弗炉500℃保温5h、480℃保温9h退火等4种处理方式对脉动热管进行预处理,观察了热管的内表面结构,测试了工质在相应表面的润湿性,并与未经处理的脉动热管内进行了对比,分析了脉动热管内表面性质对启动过程的影响机理。以几何参数相同的脉动热管为对象,以无水乙醇为工质,在50%充液率、垂直底部加热的条件下针对氧乙炔正火预处理前后的脉动热管的启动性能进行了对比实验。结果显示,经氧乙炔正火预处理后的脉动热管,工质在管内壁面的润湿性得到改善,热管的启动时间缩短且加热功率越小影响越大,在加热功率30W时启动时间缩短了74s。Start-up time is one of the most important indexes for evaluating heat transfer performance of pulsating heat pipe（PHP）,which is closely related to structure and working medium wettability of tube inner wall.The pulsating heat pipe was pretreated by using oxyacetylene normalizing,brazing furnace normalizing,500℃ muffle furnace annealing keeping 5 h and 480℃ muffle furnace annealing keeping 9 h, respectively and then their structure and working medium wettability of inner wall were investigated comparing with the PHP without treatment.The influence of inner surface properties on the start-up procedure of PHP was analyzed theoretically.The start-up time of PHP treated by oxyacetylene normalizing was experimentally studied when at the vertical bottom heat mode,by using anhydrous ethanol as working medium in the condition of 50% fill ratio of the PHP.The results reveal that oxyacetylene normalizing has a significant effect on the surface wettability of the working medium.In addition,the start-up time could be reduced especially at the lower heating power.When the heating power is 30 W,the start-up time was reduced by 74 s in comparison to the PHP without treatment.

关 键 词：脉动热管 正火处理 润湿性 表面特性 启动时间 

分 类 号：TK124[动力工程及工程热物理—工程热物理]