环路热管稳态建模及运行特性分析

建立了环路热管的稳态模型,并基于能量平衡、压力平衡、质量守恒以及几何约束进行求解,证实了许多相关文献介绍的环路热管稳态运行特性,例如,热沉温度、环境温度等对稳态蒸发温度的影响.对下述问题提出见解:蒸发器的漏热的分析;可变热导区和固定热导区的成因;固定热导区热导的变化;工质充装量和储液器容积的确定方法.结果表明,用来加热通过毛细芯的流体的蒸发器漏热分量在热载荷较大时不可忽略;反重力高度和环境对回流液体的加热是可变热导区的成因;大热载荷下,固定热导区热导随热载荷增大而减小,并可能达到临界热载荷,其解决方案在于工质充装量和储液器容积的匹配.

Steady state modeling of loop heat pipes and operating characteristics analysis

Based on energy balance,pressure balance,mass conservation and geometric constraint,the steady state model of loop heat pipes was established and solved.The modeling results not only confirms the steady state operating characteristics of loop heat pipes introduced in many literatures,but also brings forward viewpoint to the problems below:the analysis of the heat leak of the evaporator,the reason of the generation of the variable heat conductance zone and the constant heat conductance zone,the variation of the heat conductance in the constant heat conductance zone and the calculation of the mass of the working fluid charged and the volume of the compensation chamber.Results show that the heat leak of the evaporator for heating the liquid through the wick can not be neglected at high heat load;adverse gravity elevation and the heating from environment to the return liquid are the reason of the generation of the variable heat conductance zone;the heat conductance in the constant heat conductance zone decreases as the heat load increases at high heat load,and can reach the critical heat load,which can be avoided by the match of the mass of the working fluid charged and the volume of the compensation chamber.