A numerical study of the gas–liquid two-phase flow and mass transfer in a square microchannel with a T-junction is carried out in this work. Through numerical simulation methods, the flow patterns of bubble flow, slug flow and annular flow are determined. By proposing a new flow pattern conversion relationship with different media and different speeds, 100 sets of CO 2 -water flow patterns and 100 sets of CO 2 -ethanol flow patterns are obtained. The effects of surface tension on flow pattern, bubble length and liquid plug length are studied. The pressure distribution and pressure drop are analyzed, and mass transfer is obtained through slug flow simulation, and the influencing factors of gas–liquid mass transfer are studied. The results show that the effect of surface tension on the length of the bubble and the length of the liquid plug is completely opposite, the pressure distribution is stepped, and the pressure drop increases with the increase of the gas–liquid velocity. In addition, it was found that the volumetric mass transfer coefficients of the bubble cap and the liquid film gradually decreased with time, and eventually stabilized. The increase in bubble velocity accelerates the mass transfer rate, while the increase in unit cell length slows the mass transfer rate. However, the influence of film thickness and liquid film length on mass transfer varies with time.

中文翻译：

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微通道内气液两相流动和传质的数值研究

在这项工作中，对具有T型结的方形微通道中气液两相流动和传质进行了数值研究。通过数值模拟方法，确定了气泡流，团状流和环形流的流动方式。通过提出一种具有不同介质和不同速度的新的流型转换关系，获得了100组CO 2-水流型和100组CO 2-乙醇流型。研究了表面张力对流动方式，气泡长度和液塞长度的影响。分析了压力分布和压降，并通过段塞流模拟获得了传质，并研究了气液传质的影响因素。结果表明，表面张力对气泡长度和液塞长度的影响是完全相反的，压力分布呈阶梯状，并且压降随气液速度的增加而增加。另外，发现泡罩和液膜的体积传质系数随着时间逐渐减小，并最终稳定。气泡速度的增加加速了传质速率，而晶胞长度的增加则降低了传质速率。但是，膜厚和液膜长度对传质的影响随时间变化。发现气泡帽和液膜的体积传质系数随时间逐渐减小，并最终稳定。气泡速度的增加加速了传质速率，而晶胞长度的增加则降低了传质速率。但是，膜厚和液膜长度对传质的影响随时间变化。发现气泡帽和液膜的体积传质系数随时间逐渐减小，并最终稳定。气泡速度的增加加速了传质速率，而晶胞长度的增加则降低了传质速率。但是，膜厚和液膜长度对传质的影响随时间变化。