中温铯热管的启动及传热性能  

Startup and heat transfer performance of medium temperature cesium heat pipe

作　　者：郭宇翔 陈宏霞[1] 袁达忠[2,3] 李林涵 王逸然 纪阳 GUO Yuxiang;CHEN Hongxia;YUAN Dazhong;LI Linhan;WANG Yiran;JI Yang(Energy Power and Mechanical Engineering Department,North China Electric Power University,Beijing 102206,China;Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206 [2]中国科学院工程热物理研究所,北京100190 [3]中国科学院大学,北京100049

出　　处：《化工进展》2021年第11期5981-5987,共7页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(52176152,51676186);2019年度预研教育部联合基金青年人才基金(6141A02033526)。

摘　　要：由于铯化学性质活泼、易发生爆炸且价格昂贵,目前对中温铯热管的研究少见报道,而以高温钠、钾及钠钾合金热管的研究为主。鉴于中温热管应用及系统学术研究的需求,本文制备了铯热管,采用高频加热器调控其热流密度、数据采集系统监测管壁沿程的温度变化,对其启动性能及传热性能展开研究。实验结果表明,铯热管的启动演变规律与钠热管类似,利用Kn=0.01计算其转折温度更为准确。当热流密度q=18.04W/cm^(2)时,通过热管沿程温度分布可知热管实现了声速极限下的启动,绝热段温度与蒸发段温度相差30.00℃。热流密度q=69.10W/cm^(2)时,工作温度可达600.00℃,蒸发段与绝热段最大温差小于7.00℃,且有效长度为100%,表现出优异的换热性能和均温性。Due to active chemical properties and a high price of cesium,few studies on medium temperature cesium heat pipe were reported,while most researches were focus on sodium,potassium and Na-K alloy heat pipes.To meet the demands of applications at medium temperature and a systematic academic research,a medium temperature cesium heat pipe was fabricated and experimentally tested in this paper.Heat fluxes were modulated by a high frequency heater and the temperature revolutions of heat pipe wall along the pipe length were monitored by a data acquisition system.The results showed that the start-up performance of the cesium heat pipe was similar to that of a sodium heat pipe,and the transition temperature of a cesium heat pipe could be accurately calculated with Kn=0.01.When heat flux q was 18.04W/cm^(2),the temperature distribution along the heat pipe indicated that the cesium heat pipe entered the start-up state with a sonic limit,and a temperature difference between adiabatic and evaporation sections reached 30.00℃.Increasing heating flux to 69.10W/cm^(2),the working temperature of heat pipe could reach 600.00℃with the maximum temperature difference between the evaporation section and the adiabatic section less than 7.00℃.Furthermore,the effective length of this cesium heat pipe was 100%which showed an excellent heat transfer performance and temperature uniformity.

关 键 词：铯热管 传热 两相流 启动性能 均温性 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]