扁平微槽道热管蒸发冷凝极限模型  

Evaporation and condensation limitation model of flat micro-grooved heat pipe

作　　者：周豪[1] 孙志坚[1] 庞逸晨 俞自涛[1,2] ZHOU Hao;SUN Zhi-jian;PANG Yi-chen;YU Zi-tao(Institute of Thermal Science and Power Systems,School of Energy Engineering,Zhejiang University,Hangzhou 310027,China;State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学能源工程学院热工与动力系统研究所,浙江杭州310027 [2]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《能源工程》2022年第5期9-15,21,共8页Energy Engineering

摘　　要：提出了一种基于一维流动模型的铝一丙酮扁平微槽道热管毛细极限模型,并以此探究充液率对热管性能的影响。一维流动模型基于质量守恒、动量守恒和Young-Laplace方程,毛细极限模型同时考虑了由于蒸发段蒸干导致的蒸发极限和由于冷凝段液堵导致的冷凝极限,在液堵段考虑了接触角的变化。一维流动模型的计算结果发现较高的充液率会增加液相的流动损失,降低管内工质可以达到的最大速度。通过对比蒸发极限和冷凝极限,得到所研究扁平微槽道热管的毛细极限在14 W左右,相应的最佳充液率在27%-32%之间。该研究对热管的应用具有重要理论指导意义,对模型的实验验证工作后续有待开展。In this paper,a capillary limitation model of aluminum-acetone flat micro-grooved heat pipes based on onedimensional flow assumption was proposed to study the effect of liquid filling ratio on the performance of heat pipes.The mass and momentum conservation equation and Young-Laplace equation were applied.The evaporation limitation caused by dry-out in evaporation section and the condensation limitation caused by the liquid block in condensation section were both considered in the capillary limitation model,while the variation of contact angle was taken into account in liquid block section.The calculation results of the one-dimensional model showed that a higher filling rate will result in the increase of liquid phase flow loss and the drop of maximum velocity.By comparison of evaporation limitation and condensation limitation,the capillary limitation of flat micro-grooved heat pipe is roughly 14 W and the corresponding optimal filling ratio is within 27%~32%.This research has important theoretical guiding significance for the application of heat pipes.The experimental verification will be carried out in the future.

关 键 词：扁平微槽道热管 蒸发极限 冷凝极限 毛细极限 蒸干 液堵 接触角 

分 类 号：TK124[动力工程及工程热物理—工程热物理]