摘要
为分析加热面相对位置对气泡微细化沸腾(MEB)的影响,对下沉加热面上的过冷沸腾进行了实验研究,并与齐平加热面实验结果进行了对比。25~50K过冷度范围内,在下沉3mm加热面上观察到了MEB现象。在50 K过冷度下,MEB时的热流密度可达5.55 MW/m2。可视化结果表明:在MEB区域,下沉加热面上形成的蒸汽气膜会频繁地膨胀收缩;随过冷度的升高,膨胀收缩的周期增加,而幅值变化较小。此外,相比于齐平加热面条件,下沉加热面周围的壁面可显著限制蒸汽气膜的横向膨胀。
In order to analyze the effect of relative location of heating surface on microbubble emission boiling（MEB）,the subcooled boiling occurred on an imbedded heating surface was experimentally studied,and compared with that on a flush heating surface.At liquid subcooling of 25-50 K,MEB was observed on an imbedded heating surface that lowers tank bottom for 3 mm.The heat flux in MEB reaches 5.55 MW/m^2 at liquid subcooling of 50 K.Visualized results indicate that a vapor film forms on the heating surface,and expands and shrinks frequently in regime of MEB occurred on the imbedded heating surface.The increase of liquid subcooling enlarges the period of expansion and shrinkage of the film while has limited effect on its amplitude.Furthermore,the lateral expansion of vapor film in MEB can be limited by the surrounding edge of the imbeddedheating surface significantly.
作者
杨凯
唐继国
孙立成
谢果
鲍静静
莫政宇
YANG Kai;TANG Jiguo;SUN Licheng;XIE Guo;BAO Jingjing;MO Zhengyu(State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610207,China)
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2018年第7期1256-1261,共6页
Atomic Energy Science and Technology
基金
国家自然科学基金资助项目(51706149
51506099
51606130)
中央高校基本科研业务费专项资金资助项目(YJ201658)
关键词
气泡微细化沸腾
下沉加热面
临界热流密度
气泡行为
microbubble emission boiling
imbedded beating surface
critical heat flux
bubble behavior
