• CN：11-2187/TH
• ISSN：0577-6686

›› 2014, Vol. 50 ›› Issue (8): 189-196.

• 论文 •

### Y型微通道中两相界面特性变化分析

1. 北京工业大学机械工程与应用电子技术学院
• 出版日期:2014-04-20 发布日期:2014-04-20

### Numerical Analysis on Two-phase Flow Characteristics at Convection Microfluidic Y-junctions

LIU Zhaomiao;LIU Likun;SHEN Feng

1. College of Mechanical Engineering and Applied Electronics Technology,Beijing University of Technology
• Online:2014-04-20 Published:2014-04-20

Abstract: Numerical simulation on two-phase flow characteristics at convection microfluidic Y-junctions based on the two-phase flow interface tracking method. It is found that the Y-angle of the microfluidic Y-junctions, capillary number of continuous phase, and the flux of two phases have a great influence on droplet generation time, rate and size. The decreasing of continuous phase capillary number and Y-angle results in the increasing of the droplet volume. At the same time, with the increasing of flux ratio of the dispersed phase and continuous phase, the influence on the droplet volume is becoming smaller. But the flow flux ratio cannot infinite increase or decrease. Because the dispersed phase can only takes the form of liquid column or silk and it unable to generate the droplet when the ratio is greater than 0.5 or no more than 0.05. When the dispersed phase flux is increasing, the corresponding droplet formation rate is almost proportional increasing; the influence of the dispersed phase flow on the length of the droplets evolution is greater than the continuous phase. In addition, in the formation process of droplet, the filling time becomes longer and the necking time becomes shorter with the increasing of the Y-angle. The droplet detachment mechanism is mainly under the effect of normal stress of the continuous phase.