窄空间内受限空泡演化特征的可视化实验研究  

Visual Experimental Investigation on Characteristic of Confined Bubble Evolution in Narrow Space

作　　者：陈德奇 李冲[2] 黄彦平[1] 陆祺[2] 王艳林[1] 贺雪强[2] CHEN Deqi;LI Chong;HUANG Yanping;LU Qi;WANG Yanlin;HE Xueqiang(CNNC Key Laboratory on Nuclear Reactor Thermal hydraulics Technology Nuclear Power Institute of China,Chengdu 610041,China;Key Laboratory of Low-grade Energy Utilization Technologies and Systems Ministry of Education,Chongqing University,Chongqing 400044,China)

机构地区：[1]中国核动力研究设计院中核核反应堆热工水力技术重点实验室,四川成都610041 [2]低品位能源利用技术及系统教育部重点实验室重庆大学,重庆400044

出　　处：《原子能科学技术》2018年第7期1250-1255,共6页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(51206199);中央高校基本科研业务费资助项目(106112017CDJQJ148806)

摘　　要：对窄空间内自然对流条件下的沸腾空泡演化行为进行了可视化实验研究。液相工质为去离子水,实验段采用聚碳酸酯材料,窄小空间尺寸为2mm×10mm×250mm。加热片采用FTO导电玻璃,从而实现从汽泡底部观察其生长特性。本文得到了不同热流密度下的汽泡生长特性曲线,发现在汽泡生长过程中,其长度与宽度的变化均符合指数规律,且长宽比在生长末期在一个固定值附近波动。汽泡生长速度随热流密度的变化不呈线性关系,受多种因素共同影响。同时,还分析了窄空间流道内汽泡聚合过程的受限界面演化特性。A visual experimental investigation was carried out to research the characteristics of bubble evolution with natural convection in narrow space.The deionized water was used as working fluid.The experimental section was made by polycarbonate with narrow space size of 2 mm×10 mm×250 mm.To observe the bubble evolution from the bottom of experimental section,the heating section was made by FTO conductive glass.The characteristic curves of bubble growth were depicted with different heat fluxes.The results show that changes of the length and the width of bubbles conform exponentialfunction during bubble growth.The aspect ratios of bubbles fluctuate nearby a constant value at the end of bubble growth.The rate of bubble growth is not linear with the imposed heat flux,which is affected by various parameters.Also,the characteristics of confined bubble coalescence were discussed in this paper.

关 键 词：受限空泡行为 汽泡生长 汽泡聚合 可视化实验 

分 类 号：TL334[核科学技术—核技术及应用]