过冷水中单个蒸汽气泡凝结动力学过程研究  

Investigation on Condensation Dynamics of Single Vapor Bubble in Subcooled Water

作　　者：刘洪里 唐继国 刘洪涛[1] 杜敏[1] 鲍静静 孙立成[1] LIU Hongli;TANG Jiguo;LIU Hongtao;DU Min;BAO Jingjing;SUN Licheng(State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource & Hydropower,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室水利水电学院

出　　处：《原子能科学技术》2019年第6期1029-1035,共7页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(51706149,51506099,51606130);中国博士后科学基金资助项目(2018M643474);中央高校基本科研业务费专项资金资助项目(YJ201658)

摘　　要：对高过冷度条件下单个蒸汽气泡的凝结过程进行了可视化研究,并与现有的计算模型进行了对比。实验结果表明:高过冷度条件下,运动速度较高的气泡脱离后,其底部产生的液体射流现象会加剧气泡的变形和凝结过程;而现有的计算关联式均无法较好地预测该条件下的气泡动力学行为,凝结末期的相对误差超过50%。此外,通过Sobol方法对气泡凝结模型进行了敏感性分析,并定量评估了不同实验范围内Reynolds数、Jacob数以及Prandtl数对气泡凝结的影响程度。A visualized investigation was performed to study the condensation process of a single vapor bubble under high subcooling conditions.The obtained experimental data were compared with the existing correlations.Experimental results show that a liquid jet will form at the bottom of a vapor bubble with high velocity after its detachment at high subcooling,which accelerates bubble deformation and condensation process.In addition,the existing correlations are not able to predict the condensation dynamics of vapor bubble at high subcooling very well,and the relative errors exceed 50%at the end of condensation.Further,the sensitivity analysis was performed with Sobol model to analyze the existing correlations,and the impact of Reynolds number,Jacob number and Prandtl number on bubble condensation process under different conditions was evaluated quantitatively.

关 键 词：气泡动力学 凝结换热 敏感性分析 

分 类 号：TK124[动力工程及工程热物理—工程热物理]