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本文基于VOF(Volume of Fluid)相界面追踪方法,建立了流动聚焦微通道中双乳液液滴形成的模型,研究了互不相溶的三种流体在微流控系统中形成双重液滴的典型物理过程,给出了双重液滴形成的典型工况,分析了流动参数和工质物性对液滴形成过程的影响。结果表明:双重乳液液滴形成过程可分为滴式与喷式两种模式;外流体流量增大时液滴形成模式由滴式转变为喷式,所形成的双重液滴尺寸减小;中间流体流量变化对液滴形成模式、所形成的双重乳液内液滴尺寸影响不明显,外液滴随中间流体流量增大而增大。
In this paper, based on the VOF (Volume of Fluid) phase interface tracking method, a model of double emulsion droplet formation in a flow-focused microchannel was established. Three types of droplets that are incompatible with each other in a microfluidic system The physical process is given, and the typical working conditions of double droplet formation are given. The influence of flow parameters and working substance physical properties on the droplet formation process is analyzed. The results show that the droplet formation process of double emulsions can be divided into two modes: droplet and spray; the droplet formation mode changes from droplet to spray when the flow rate of outer fluid increases, and the size of double droplets formed decreases; The change of fluid flow has no obvious effect on the droplet formation mode and the effect of the droplet size in the double emulsion formed. The external droplet increases with the flow rate of the intermediate fluid.