Abstract:

Due to the nonlinear dynamic characteristics, the liquid-liquid interface rupture process is often accompanied by the generation of satellite droplets, which poses a challenge to the uniformity and precision of droplets-based microfluidic technology. The complex dynamic characteristics of interfacial instability of microfluidics are explained, and the factors influencing the interfacial instability are analyzed. In addition, the phenomenon and mechanism of satellite droplet formation associated with the interfacial instability are revealed. Based on the new concept of the inertial microfluidics, the mechanism of the separation of satellite droplet by using the inertial microfluidics is highlighted. The integration principle of generation-inertial microfluidics separation for the satellite droplet is proposed, as well as the parallelization criterion for the corresponding numbering-up. The implementation of this topic is beneficial for the realization of the target of precision in producing monodisperse droplets with microfluidics technology, laying a solid foundation for the interfacial dynamics and manipulation of microfluidics and complex fluids.

Key words: microfluidics, microchannel, droplet, inertial microfluidics, multiphase flow

摘要：

由于非线性动态特征，液液界面破裂过程常伴随卫星液滴的产生，对基于液滴的微流体技术生产液滴的均一性和精准化目标提出了挑战。阐释了微流体界面失稳的复杂动力学特征，剖析了界面失稳的影响因素，并分析了伴随界面失稳而产生的卫星液滴的现象与原理。结合惯性微流体新概念，总结了卫星液滴的惯性分离机制。展望了卫星液滴生成-惯性微流体分离一体化及其并行化数目放大的构想。相关工作的开展，有利于实现微流体技术生产单分散性液滴的精准化目标，为微流体与复杂流体相关的界面动力学行为与调控夯实基础。

关键词: 微流体, 微通道, 液滴, 惯性微流体, 多相流