化工进展 ›› 2018, Vol. 37 ›› Issue (06): 2116-2124.DOI: 10.16085/j.issn.1000-6613.2018-0033

• 化工过程与装备 • 上一篇    下一篇

正火预处理对脉动热管启动时间的影响

王瑞祥, 闫梦霏, 徐荣吉, 邢美波   

  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
  • 收稿日期:2017-09-04 修回日期:2018-03-22 出版日期:2018-06-05 发布日期:2018-06-05
  • 通讯作者: 王瑞祥(1965-),男,教授,研究方向为制冷与空调系统热物理过程、界面调控与纳米工质技术。
  • 作者简介:王瑞祥(1965-),男,教授,研究方向为制冷与空调系统热物理过程、界面调控与纳米工质技术。E-mail:wangruixiang@bucea.edu.cn。
  • 基金资助:
    国家自然科学基金青年基金(51506004)、北京市自然科学基金(3162009)及北京市创新能力提升计划(TSJHG201310016011)项目。

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

WANG Ruixiang, YAN Mengfei, XU Rongji, XING Meibo   

  1. Beijing Engineering Research Centre of Sustainable Energy and Buildings, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
  • Received:2017-09-04 Revised:2018-03-22 Online:2018-06-05 Published:2018-06-05

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。

关键词: 脉动热管, 正火处理, 润湿性, 表面特性, 启动时间

Abstract: 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 5h and 480℃ muffle furnace annealing keeping 9h, 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 30W, the start-up time was reduced by 74s in comparison to the PHP without treatment.

Key words: pulsating heat pipe(PHP), normalizing, wettability, surface characteristic, start-up time

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