单根C型管外过冷沸腾传热特性实验及分析  

Experimental analysis of heat transfer characteristics out of single C-shaped tube under subcooled boiling conditions

作　　者：刘延斌[1] 王学生[1] 王浩[1] 陈琴珠[1] 孟祥宇[1] LIU Yan-bin;WANG Xue-sheng;WANG Hao;CHEN Qin-zhu;MENG Xiang-yu(Key Laboratory of Pressure Systems and Safety,Ministry of Education,East China University of Science&Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学承压系统与安全教育部重点实验室,上海200237

出　　处：《高校化学工程学报》2022年第3期346-353,共8页Journal of Chemical Engineering of Chinese Universities

摘　　要：为探究影响核反应堆运行安全的非能动余热排出热交换器(PRHR HX)管外过冷沸腾传热特性,搭建单根C型管装置,结合可视化技术开展实验研究。结果表明:随着成核数量的增加及汽泡尺寸的增大,水平及竖直观测点对应水温分别由95.1和84.7℃上升至饱和温度,传热系数分别在7930.9~14545.9 W·m^(-2)·℃^(-1);及2876.9~8742.2 W·m^(-2)·℃^(-1);持续增大,过冷度分别由4.9及15.3℃减小至接近0℃,壁温及过热度的变化均在2.0℃内。热流密度实验值与q~Δθ^(n)_(sat);模型和叠加模型对应经验公式预测值偏差较大,基于削弱系数模型分别对水平及竖直段拟合了过冷沸腾经验公式,平均偏差为1.9%和6.4%。此外,对水平段拟合了饱和沸腾经验公式,偏差在±5%以内。In order to explore heat transfer characteristics out of passive residual heat removal heat exchanger(PRHR HX)tubes,which affects operation safety of nuclear reactors,a single C-shaped tube setup was built and experimental study was conducted with visualization technology.The results show that with the increase of nucleation number and bubble size,the water temperatures at horizontal and vertical observation points increase from 95.1 and 84.7℃to saturation temperature,respectively.Correspondingly,the heat transfer coefficients increase in the range of 7930.9-14545.9 W·m^(-2)·℃^(-1) and 2876.9-8742.2 W·m^(-2)·℃^(-1),and the subcooling degrees decrease from 4.9 and 15.3℃ to nearly 0℃.The wall temperature and superheat degree vary within2.0℃.The differences between experimental heat fluxes and predicted values with empirical correlations based on the q~Δθ^(n)_(sat);and superposition model were obvious.Empirical correlations were fitted for horizontal and vertical sections based on the weakening coefficient model under subcooled boiling conditions,and the average prediction errors were 1.9% and 6.4%,respectively.Horizontal section under saturation boiling conditions was also fitted and the error was within±5%.

关 键 词：传热 可视化 汽泡 过冷沸腾 实验验证 

分 类 号：TQ051.5[化学工程]