高温液钠在不锈钢丝网吸液芯中毛细特性研究  

Study on Capillary Characteristics of High Temperature Liquid Sodium in Stainless Steel Wire Mesh Wick

作　　者：朱怡儒 马誉高 张卢腾 席治国[1,2] 唐思邈 马在勇 潘良明[1,2] 张卓华[3] 丁书华[3] Zhu Yiru;Ma Yugao;Zhang Luteng;Xi Zhiguo;Tang Simiao;Ma Zaiyong;Pan Liangming;Zhang Zhuohua;Ding Shuhua(Key Laboratory of Low-grade Energy Utilization Technologies and Systems,Ministry of Education,Chongqing University,Chongqing,400044,China;Department of Nuclear Engineering and Technology,Chongqing University,Chongqing,400044,China;Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu,610213,China)

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400044 [2]重庆大学核工程与核技术系,重庆400044 [3]中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610213

出　　处：《核动力工程》2024年第2期110-115,共6页Nuclear Power Engineering

基　　金：国家自然科学基金(12305174);中国博士后科学基金(2023M730397);重庆市自然科学基金(2023NSCQ-BHX0243)。

摘　　要：碱金属高温热管吸液芯的毛细特性对于热管的正常运行具有重要意义。本文采用毛细上升法和称重法在手套箱中开展了高温液态金属钠(简称液钠)在不同目数的304不锈钢丝网吸液芯中毛细特性的实验研究。实验获得了不同温度阶段下吸液芯毛细性能的变化规律,结果表明:在低于460℃阶段,吸液芯毛细性能提升有限,这是由于不锈钢表面Cr2O3氧化膜对液钠润湿性影响决定的。温度高于460℃之后,液钠与Cr_(2)O_(3)发生腐蚀反应,吸液芯毛细性能明显增强。且液钠对不锈钢表面氧化膜的破坏是不可逆的,在后续加热周期的温度变化阶段将保持最佳浸润性,吸液芯毛细特性将主要受到表面张力物性的影响,呈现随温度升高吸液芯质量下降的变化趋势。根据毛细理论并结合吸液芯结构建立了吸液芯毛细抽吸模型,降温阶段模型预测吸钠质量与实验值的误差在12%以内。The capillary characteristics of the alkali metal high temperature heat pipe wick are of great significance to the normal operation of the heat pipe.In this paper,the capillary rise method and the weighing method were used to carry out the experimental study on the capillary characteristics of the high temperature liquid metal sodium in the 304 stainless steel wire mesh wick with different mesh numbers in the glove box.The variation of the capillary performance of the wick at different temperature stages was obtained.The results show that the improvement of the capillary performance of the wick is limited below 460℃,which is due to the influence of Cr_(2)O_(3) oxide film on the wettability of liquid sodium on the stainless steel surface.When the temperature is higher than 460℃,the liquid sodium reacts with Cr_(2)O_(3),and the capillary performance of the wick is obviously enhanced.The damage of liquid sodium to the oxide film on the surface of stainless steel is irreversible,and the best wettability will be maintained in the temperature change stage of the subsequent heating cycle.The capillary characteristics of wick are mainly affected by surface tension and physical properties,showing a changing trend that the mass of wick decreases with the increase of temperature.According to the capillary theory and the structure of the wick,a capillary suction model of the wick is established.The error between the predicted sodium absorption mass and the experimental value in the cooling stage is within 12%.

关 键 词：高温热管 丝网吸液芯 液钠 毛细特性 毛细抽吸模型 

分 类 号：TL334[核科学技术—核技术及应用]