作　　者： ; ;

机构地区： 中国科学院广州能源研究所

出　　处： 《工程热物理学报》 2008年第4期605-608,共4页

摘　　要： 本文在空气自然冷却条件下,对MEMS硅基并联微通道中蒸汽凝结换热的流型和多通道效应进行了可视化研究,发现在低入口饱和蒸汽压下,通道入口为准静止状态的汽弹、汽弹前端周期性脱离汽泡、通道下游为泡状流;在高入口饱和蒸汽压下,通道内为环状流.汽泡脱离存在单汽丝断裂、双汽丝同步断裂以及双汽丝非同步断裂三种不同模式.汽液界面上表面张力不均匀引起Marangoni对流,使得两侧通道中的汽泡一旦形成,便被推向通道的高温侧. The flow pattern and multichannel effect of steam condensation in MEMS-based silicon parallel microchannels were visualized under the condition of air natural convection cooling. It was found that at low inlet saturated pressures there exist qusi-stable bubble slug in the inlet, periodical detached bubbles from the bubble slug tip and bubbly flow in the downstream, while at high inlet saturated pressures, the flow pattern becomes annular flow. During the bubble detachement from the bubble slug tip, it behaved three different breakup mode named as single vapor thread breakup mode, synchronous dual vapor threads breakup mode and asynchronous dual vapor threads breakup mode. The non-uniform surface tension at the liquid-vapor interface causes the Marangoni convection, leading that the bubble was pushed to the hot side once it was formed.

关 键 词： 凝结 流型 多通道效应 对流

领　　域： [动力工程及工程热物理] [动力工程及工程热物理]