锥形毛细芯平板热管传热特性研究.pdf

cm第51卷第24期
机械工·程学报
2015年12月
JOURNAL OF MECHANICAL ENGINEERING
2015
DOI:10.3901/JME2015.24.132
锥形毛细芯平板热管传热特性研究
李红传2纪献兵2郑晓欢2杨卧龙2徐进良,2
华北电力大学新能源电力系统国家重点实验室北京102206
2.华北电力大学多相流与传热北京市重点实验室北京102206)
摘要:随着机械电子设备的不断发展,热管理问题面临越来越严重的挑战,为解决此问题,根据仿生学原理,以天鹅线竹芋
表面微观凸起结构为设计依据,以纳米尺度铜粉为材料烧结制备锥形毛细芯,构造新型平板热管,并以去离子水为工质对其
热性能进行研究。硏究加热功率、平板热管放置角度及毛细芯氧化与未氧化等因素对平板热管传热特性的影响。结果表明,
由于锥形毛细芯多尺度孔隙结构的存在,不仅实现蒸汽从大尺度孔隙逸出,液体从小孔隙吸入,而且缩短了液体流动路径,
减小了流动阻カ,同时扩大了换热面积,因此大大提高了平板热管的传热性能。雒形毛细芯平板热管具有较好的传热性能及
抗重力特性。毛细芯经氧化处理后可显著减小平板热管的换热热阻,提高平板热管的传热性能,在热流密度为107.1Wfcm2
时,其总热阻最小值为0.079K/W。
关键词:锥形;毛细芯;平板热管;传热;氧化;热阻
中图分类号:TK124
Study on Heat Transfer Properties of Flat Heat Pipe with
Conical Capillary Wicks
LI Hongchuan, 2
JI Xianbing
ZHENG Xiaohuan YANG Wolong XU Jinliang
(1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,
North China Electric Power University, Beijing 102206
2. Beijing Key Laboratory of Multiphase Flow and Heat Transfer,
North China Electric Power University, Beijing 102206)
Abstract: With the development of mechanical and electronic equipments, thermal management problem becomes more and more
challenging. In order to solve this problem, according to the bionics principle, a new structure flat heat pipe(FHP), based on the micro
structure of the Calathea zebrine, using nano-scale copper powder as sintered material, is constructed with conical capillary wicks
and its thermal performance is investigated experimentally with deionized water used as the working fluid. The effect of heati
power, inclination angle and capillary wicks through oxidation on thermal performance of the FHP are studied. The results show that
the existence of the multi-scale pore gap of the conical capillary wicks not only realized the vapor escape from large pore gap and
liquid suck from small pore gap, but also shortened the liquid flow path, and reduced the flow resistance, as well as expanded the heat
transfer area, thus greatly improved the heat transfer performance of the FHP. The new structure FHP has good thermal and
anti-gravity performance. Capillary wicks through oxidation can significantly reduce the FHPS thermal resistance, improving its
thermal performance, and its minimum total thermal resistance is equal to 0.079 K/W when the heat flux reaches to 107.1 W/cm
Key words: conical; capillary wick; flat heat pipe; heat transfer; oxidation; thermal resistance
使用寿命,因此迫切需要解决其散热问题。热管是
0前言
种高效的导热元件,具有热阻小、均温性好、导
热率高及热响应快等优点,已成为高热流密度机槭
随着科学技术的发展,大功率机械电子设备及电子设备及电子器件领域散热的理想元件,为此许
电子器件不断问世,然而由于单位体积内产热量增多研究人员对其进行了大量研究。SH等叫以体积
多,导致这些设备及器件温度升高,缩短了它们的分数为50%的乙醇水溶液为工质,在充液率为50%
的情况下,对多环路脉动热管的传热特性进行了试
国家自然科学基金(51276061,51436004)和北京市科技计划课题
(Z121010061000资助项目。20150623收到初稿,20151030收到修
验与机理研究,并与无水乙醇的传热效果进行了对
改稿