In this paper, we investigated the droplet splitting using different spacers in the air. The droplets were manipulated by the EWOD force and the level set method was used for our numerical implementation. The results show that the property of spacer has the effect on the droplet splitting. Specifically, we showed that the re-merging occurred when split daughter droplets pass the sub-channels for the short spacer and unequal droplet splitting can be achieved for the off-centered obstacle. In the study of the thickness, the thicker spacer made the splitting process unstable. Furthermore, we found that the triangle spacer was optical for the separation from the consideration of pressure. Our task can provide some help for the design of the spacer size in the future.

在本文中，我们研究了在空气中使用不同间隔物进行的液滴分裂。液滴通过EWOD力进行操纵，水平设置方法用于我们的数值实现。结果表明，隔离物的性质对液滴的分裂有影响。具体来说，我们表明当分裂的子液滴通过短间隔子通道时会发生重新合并，并且偏心障碍物可以实现不相等的液滴分裂。在厚度研究中，较厚的垫片使分裂过程不稳定。此外，我们发现从考虑压力的角度来看，三角垫片是光学分离的。我们的任务可以为将来的垫片尺寸设计提供一些帮助。