液体过冷度对沸腾换热中汽泡合并及传热的影响  

Subcooling Effect on Bubble Coalescence and Heat Transfer in Pool Boiling

作　　者：毕景良[1,2] 李雪芳[1] 柯道友[1] 黄彦平[2] 

机构地区：[1]热科学与动力工程教育部重点实验室清华大学热能工程系,北京100084 [2]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,成都610041

出　　处：《工程热物理学报》2015年第8期1737-1741,共5页Journal of Engineering Thermophysics

基　　金：国家创新研究群体自然科学基金项目(No.51321002);国家重点基础研究计划项目(973)(Grant No.2011CB706904);国家杰出青年科学基金(No.11325526)

摘　　要：本文对三种过冷度下,微尺度加热片阵列上的沸腾换热现象做了实验研究,实验采用两组核化点,每个核化点包含12个大小约为0.1 mm×0.1 mm的微型加热片。利用高速摄像技术从汽泡的底部对汽泡生长及合并现象进行观测,并用高速数据采集系统同步记录不同加热片热流密度.实验探究了不同过冷度下的汽泡合并现象,以及对应的汽泡直径变化规律、汽泡脱离频率和热流密度曲线。文章分析了不同的合并现象并探究了过冷度对沸腾传热的影响。The paper experimentally investigated the nucleate boiling phenomena on a microheater array at three subcooling conditions.Two nucleation sites were utilized,and each site contains 12 approximately 0.1 mm×0.1 mm microheaters.Bubble growth and coalescence were observed with a high-speed camera under the bubble while the heat fluxes were recorded with a high-speed data acquisition system.The results show that the coalescence phenomena,bubble departure frequencies,boiling heat flux were different at three subcooling conditions.Different coalescence phenomena and effects of subcooling were analyzed.

关 键 词：饱和沸腾 过冷沸腾 热流密度 汽泡合并 脱离频率 

分 类 号：TK123[动力工程及工程热物理—工程热物理]