摘要
流型是大量汽泡运动的统计平均,流道间隙对单蒸汽泡运动特性影响明显,窄缝流道的尺寸效应是影响蒸汽-水两相流流型形成与演变的关键因素之一,而单蒸汽泡纵横比是构建两相流漂移速度的关键参数之一。本文实验研究了过冷条件下,竖直窄缝通道内单蒸汽泡形状,分析了流道间隙对单蒸汽泡纵横比的影响。过冷条件下,流道间隙越小,单蒸汽泡冷凝越快,直径减小越快,单蒸汽泡纵横比数值和离散度增大,形状变化更加剧烈。
Flow regimes are behavior assembly average of plenty of single bubbles.Channel gap affect behavior of single vapor bubbles obviously.The channel gap is one of the key parameters to affect formation and evolution of f low regimes of vapor-water two phase f lows.Aspect ratio of bubbles is also a key parameter to construct the drift velocity of two phase f lows.Experimental study was carried out on shape of single vapor bubbles under subcooling conditions in a vertical narrow channel.T he effect of the channel g ap was a nalyzed.Results s howed that condensation rate of single vapor bubbles increased as the channel gap decreasing.Meanwhile,the aspect ratio and its deviation increased more obviously,and the shape changed violently.
出处
《科技创新导报》
2019年第28期99-99,101,共2页
Science and Technology Innovation Herald
关键词
单蒸汽泡
行为特性
流道间隙
热工水力
Single vapor bubble
Behavior
Channel gap
Thermal hydraulics
