摘要
目的为了提高带有分支结构的平板脉动热管的启动性能和传热性能,对不同分支长度的平板脉动热管的热力特性进行研究。方法通过设计并搭建可视化试验平台,控制工质类型、分支长度、充液率、加热功率及倾斜角等参数,对热管的启动、传热和工质流动特性进行研究,观察工质的流形及运行温度曲线,对比分析平板脉动热管的传热性能。结果平板脉动热管的启动方式为渐进式启动,工质由泡状流演变为环状流;由于分支结构的存在,使管内工质分布均匀,缩短了热管的启动时间。结论分支结构的存在极大地增加了热管的传热性能,最佳工况下(无水乙醇、充液率50%、120 W、26 mm)传热性能相比无分支型热管提升了15.3%。
In order to improve the start-up and heat transfer performance of flat pulsating heat pipes with branch structures,the thermal characteristics of flat pulsating heat pipes with different branch lengths were studied.By designing and building a visual experimental platform,controlling parameters such as the type of working fluid,branch length,filling rate,heating power,and tilt angle,the start-up,heat transfer,and flow characteristics of the heat pipe are studied.The manifold and operating temperature curve of the working fluid are observed,and the heat transfer performance of the flat pulsating heat pipe is compared and analyzed.The experimental results showed that the starting mode of the flat pulsating heat pipe was progressive,and the working fluid evolved from bubbly flow to annular flow.Due to the existence of branching structure,the distribution of working fluid inside the tube is uniform,which shortens the start-up time of the heat pipe.The existence of branching structure greatly increases the heat transfer performance of the heat pipe,and under the optimal operating conditions(anhydrous ethanol,liquid filling rate of 50%,120 W,26 mm),the heat transfer performance is improved by 15.3%compared to the non branching heat pipe.
作者
邹惠芬
王宏伟
刘超翔
ZOU Huifen;WANG Hongwei;LIU Chaoxiang(School of Municipal and Environmental Engineering,Shenyang Jianzhu University,Shenyang,China,110168)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2024年第6期1054-1059,共6页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51978421)。
关键词
脉动热管
分支结构
均匀加热
渐进式启动
传热性能
pulsating heat pipe
branch structure
uniform heating
progressive startup
heat transfer performance
