基于毛细不稳定性的聚焦通道微液滴操控研究

针对目前利用微流道产生微液滴时，存在的制作成本高、难于控制液滴大小的缺点，采用数值模拟的方法对聚焦通道进行研究。文章基于毛细不稳定性来系统研究聚焦流道液滴生成与作用规律。研究中主要采用水平集方法，探讨了连续相速度、表面张力、两相黏度比、通道尺寸等因素对于液滴生成的影响，并从不稳定性角度来阐释其物理机制。研究结果表明水平集方法可以很好地模拟液滴破碎，发现连续相速度、表面张力、两相黏度比对液滴尺寸影响较大

Study on Micro-Droplet Manipulation in Focusing Channel Based on Capillary Instability

There are some disadvantages in the fabrication of micro droplet in micro-channels. such as high cost anddifficulty of droplet size control. The law of droplet fabrication was studied by investigating capillary instability. Level setmethod was adopted for study the impact on the droplet of different factors. such as continuous phase velocity. surfacetension. two phase viscosity ratio and channel size. The physical mechanism was explained with the respect of capillaryinstability. The result shows that level set method can be adopted to simulate the droplet breakup process. Continuousphase velocity. surface tension and viscosity have great impact on the droplet size.