夹套式径向热管的换热特性研究  

THE HEAT TRANSFER CHARACTERISTICS OF THE JACKET-TYPE RADIAL HEAT PIPE

作　　者：焦永刚[1,2] 夏国栋[1] 王丹[1] 王伟[1] 黄素格[1] 

机构地区：[1]北京工业大学环境与能源工程学院传热强化与过程节能教育部重点实验室,北京100124 [2]石家庄铁道大学能源与环境工程系,石家庄050043

出　　处：《太阳能学报》2015年第1期179-184,共6页Acta Energiae Solaris Sinica

基　　金：国家重点基础研究发展(973)计划(2011CB710704);国家自然科学基金(51176002)

摘　　要：根据夹套式径向热管的结构特点,建立夹套式径向热管的一维非稳态数学模型,分析热管输入功率和充液率对热管启动性能的影响,以及对蒸发侧换热系数、冷凝侧对流换热系数和热管总热阻的影响。计算结果显示,充液率的提高可降低热管的最高工作温度,但缩短了热管的启动时间。随着输入功率的增加,热管的工作温度升高,达到稳定状态的时间增加,随着热管输入功率的增加和充液率的增加热管的总热阻减小。另外,建立内管壁面凝结换热模型,并计算沿内管周向液膜厚度的分布以及沿内管周向的局部换热系数。A simple, rapid mathematical model to calculate the non-steady-state startup process of the jacket-type radial heat pipe is presented in this paper. The model is based on the special structure and using conditions of the jacket-type radial heat pipe, the vapor temperature in heat pipe only changes over time. The startup performance of the heat pipe with variation input heat flux and the filling rate is analyzed. The results manifest that the filling rate increased will reduce the maximum operating temperature of the heat pipe and shorten the startup time of the heat pipe. With the increase of input heat flux, the operating temperature increases and the time to reach the steady state of the heat pipe is added. The total thermal resistance of heat pipe decreases with the increase of the input heat flux and filling rate. In addition, a condensation heat transfer model is presented, the liquid film thickness and the local heat transfer coefficient of the inner wall surface is calculated.

关 键 词：径向热管 非稳态 充液率 总热阻 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]