摘要
针对不同压力下窄通道内的过冷流动沸腾汽泡核化进行了实验研究,通过高速摄影技术观察了汽泡的核化和滑移过程。实验结果表明,与常规通道有所不同,窄通道内的汽泡一般不会离开加热壁面而产生浮升现象,汽泡主要沿加热壁面进行滑移运动。不同压力条件下的汽泡核化有较大的差别,较低压力条件下汽泡核化点沿加热壁面分布比较均匀,而压力升高后的汽泡核化点主要集中在沸腾起始点附近,下游核化点数目则相对较少。核化点分布形式的不同主要是由不同压力下汽泡滑移特性的不同所导致的。
The bubble nucleation in a narrow channel under sub-cooled flow boiling was experimentally studied .The high speed digital camera was used to observe the nuclea-tion and sliding of bubbles .Most of the bubbles in the experiments slide along the heated surface ,but not lift off the surface ,as it is usual in a conventional channel .The nucleation of bubble was different at higher and lower system pressure .The nucleation sites at lower pressure distribute uniformly along the heated surface .However ,most of the nucleation sites at higher pressure concentrate near the onset of nucleation boiling . T he discrepancy of the bubble nucleation sites distribution is mainly caused by the different bubble sliding characteristics at different system pressures .
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2014年第5期806-811,共6页
Atomic Energy Science and Technology
基金
中央高校基本科研业务费专项资金资助项目(HEUCFZ1008)
教育部留学归国基金资助项目(2012-1707)
哈尔滨工程大学核安全与仿真技术国防重点学科实验室开放基金资助项目(HEUFN1305)
关键词
窄通道
汽泡核化
汽泡滑移
过冷流动沸腾
narrow channel
bubble nucleation
bubble sliding
sub-cooled flow boiling
