摘要
采用高速摄像仪对T型进口的矩形微通道内气液二相流型进行了实验研究,实验物系采用单乙醇胺(MEA)水溶液-N2和单乙醇胺水溶液-CO2。对于无相间传质的单乙醇胺水溶液-N2二相流动过程,观测到了泡状流、弹状流、弹状-环状流和液环流;对于伴有化学吸收的单乙醇胺水溶液-CO2二相流动过程,未观测到泡状流,而观测到弹状-泡状流。在实验范围内,随着深宽比减小,无论是否伴有化学吸收,弹状流区域均减小;对伴有化学吸收的气液二相流,随化学反应速率的增大,流型转换线向右移动。以化学反应速率为控制参数,分别给出流型转换判别式,预测结果与实验数据吻合良好。在弹状-泡状流型中,随着气相表观流速的下降和液相表观流速、深宽比以及化学反应速率的上升,微通道内临界泡状距离减小。
The gas-liquid two-phase flow was visualized and studied experimentally by using a high speed camera in a T-shape microchannel with rectangular cross section. The experimental materials were monoethanolamine （MEA） aqueous solutions-N2 and MEA aqueous solutions-CO2. For MEA aqueous solutions-N2 two-phase flow without inteffacial mass transfer, bubble flow, slug flow, slug-annular flow and annular flow were observed. For MEA aqueous-CO2 two-phase flow with chemical absorption, slug-bubble flow was observed but no bubble flow observed. In the experiment, the region of slug flow shrank with decreasing aspect ratio whether with or without chemical absorption; for gas-liquid two-phase flow accompanied with chemical absorption, transition lines shifted rightward as the chemical reaction rate increased. Taking the chemical reaction rate as a parameter, the predicting criterions of flow regime transition were proposed, which showed a good predicting performance. In slug-bubble flow, critical bubble distance decreased with decreasing gas flow rate and increasing liquid flow rate, aspect ratio and chemical reaction rate.
出处
《化学工程》
CAS
CSCD
北大核心
2013年第10期40-44,共5页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(21276175
21106093)
关键词
微通道
气液二相流
化学吸收
流型
临界泡状距离
microchannel
gas-liquid two-phase flow
chemical absorption
flow regime
critical bubble distance
