Flow focusing geometry generates droplets through a plug and squeeze mechanism
Flow focusing geometry generates droplets through a plug and squeeze mechanism
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DOI：
10.1039/c2lc40938k
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发表时间：
2012-01-01
期刊：
影响因子：
6.1
通讯作者：
Abate, Adam R.
中科院分区：
文献类型：
--
作者：
Romero, Philip A.;Abate, Adam R.
微滴通常由两种微流体几何形状中的一种产生，即T形连接和流动聚焦。这两个几何形状通常被认为是通过不同的机制形成水滴。在这里，通过直接测量液滴生成器中的压力，我们发现流动聚焦设备的压力波动与在T形接头中发现的压力波动基本相同，这表明在这些设备和中低毛细管数的情况下，液滴的形成过程也是由界面应力主导的，并通过堵塞-挤压过程进行。
Microdroplets are typically generated by one of two microfluidic geometries, the T-junction and flow focusing. These two geometries are often thought to form drops through different mechanisms. Here, by directly measuring the pressures in the drop maker, we show that flow focus devices exhibit pressure fluctuations that are essentially identical to those found in T-junctions, suggesting that, in these devices and low-to-moderate capillary number, the drop formation process is also dominated by interfacial stresses and proceeds through a plugging-squeezing process.