Visualization Investigation on Temperature Oscillation and Two-Phase Behaviors of A Flat Loop Heat Pipe  

作　　者：DU Sheng ZHANG Quan LING Li ZOU Sikai LIU Lijun MENG Fanxi 

机构地区：[1]College of Civil Engineering,Hunan University,Changsha,410082,China [2]School of Civil Engineering,Hunan University of Technology,Zhuzhou,412007,China

出　　处：《Journal of Thermal Science》2023年第4期1536-1546,共11页热科学学报（英文版）

基　　金：This work was supported by National Natural Science Foundation of China(NSFC)(Grant No.51878254);National Key R&D Program of China(Grant No.2018YFE0111200);Key Research and Development Plan of Hunan Province(2020WK2012);Hunan Provincial Science and Technology Department(2020GK4057).

摘　　要：To better analyzing the temperature oscillation and the two-phase behavior inside a flat loop heat pipe,visual studies were conducted.Under the 20℃ water cooling and horizontal orientation,the effects of the filling ratio and heat loads on the temperature oscillation were analyzed.Based on the experimental data,the results indicate that owing to the increased system pressure,the temperature oscillation decays as the filling ratio increases from 34%to 58%.Meanwhile,during the startup process,temperature oscillation tends to occur during the boiling and steady stages due to the more violent two-phase behavior,while the temperature curves are smooth during the slow evaporation stage.Moreover,as the heat load increases,the evaporation becomes more intense at the active zone of evaporator,leading to a faster startup process and a higher oscillation frequency.Besides,owing to the synergistic effect of two-phase flow in the compensation chamber caused by heat leak and subcooled liquid backflowing,a“breathing”oscillation behavior of the vapor-liquid interface is observed at the compensation chamber,which further leads to the unstable operation behavior of the loop heat pipe system.

关 键 词：loop heat pipe temperature oscillation visualization observations two-phase flow patterns start-up characteristics vapor-liquid interface fluctuation 

分 类 号：TN03[电子电信—物理电子学] TK124[动力工程及工程热物理—工程热物理]