Capillary‐Based Microfluidics—Coflow, Flow‐Focusing, Electro‐Coflow, Drops, Jets, and Instabilities

作者：Josefa Guerrero, Ya‐Wen Chang, Alexandros A. Fragkopoulos, Alberto Fernández‐Nieves · 发表于：Small · 年份：2019 · DOI：10.1002/smll.201904344 · 被引用次数：89 · 研究领域：Innovative Microfluidic and Catalytic Techniques Innovation、Electrohydrodynamics and Fluid Dynamics、Electrowetting and Microfluidic Technologies

Capillary-based microfluidics is a great technique to produce monodisperse and complex emulsions and particulate suspensions. In this review, the current understanding of drop and jet formation in capillary-based microfluidic devices for two primary flow configurations, coflow and flow-focusing is summarized. The experimental and theoretical description of fluid instabilities is discussed and conditions for controlled drop breakup in different modes of drop generation are provided. Current challenges in drop breakup with low interfacial tension systems and recent progress in overcoming drop size limitations using electro-coflow are addressed. In each scenario, the physical mechanisms for drop breakup are revisited, and simple scaling arguments proposed in the literature are introduced.