毛细管数
分手
毛细管作用
线程(计算)
粘性液体
机械
流动聚焦
微流控
物理
两相流
热力学
体积流量
机械工程
工程类
作者
Thomas Cubaud,Thomas G. Mason
出处
期刊:Physics of Fluids
[American Institute of Physics]
日期:2008-05-01
卷期号:20 (5)
被引量:330
摘要
We experimentally study the formation and evolution of threads containing more viscous liquids surrounded by less viscous, immiscible liquids through hydrodynamic focusing in square microchannels. Over a large range of viscosities and interfacial tensions, five characteristic regimes of flow behavior are identified: threading, jetting, dripping, tubing, and displacement. We locate the boundaries between these regimes on a flow map based on the capillary number of each fluid. In the jetting and the dripping regimes, the droplet size is measured and related to fluid properties, flow parameters, and geometry. The critical thread length before jetting droplets and the critical length of a viscous tail before breakup in dripping are also examined. This study classifies and defines regimes of thread instabilities that can be used to produce supra- and subchannel size viscous droplets in an elementary microfluidic geometry.
科研通智能强力驱动
Strongly Powered by AbleSci AI