Experimental study of double emulsion formation behaviors in a one-step axisymmetric flow-focusing device

Experimental study of double emulsion formation behaviors in a one-step axisymmetric flow-focusing device
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一步式轴对称流聚焦装置中双乳液形成行为的实验研究

DOI:
10.1016/j.expthermflusci.2018.12.032
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发表时间:
2019-05
影响因子:
3.2
通讯作者:
Meifang Liu
Meifang Liu
中科院分区:
工程技术2区
文献类型:
--
作者:
Cheng Yu;Liangyu Wu;Lei Li;Meifang Liu

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基于可视化系统,对一步轴对称流聚焦微流控装置中双重乳液的形成行为进行了实验研究。典型的液滴形成制度进行了检查和液滴的大小和形态上的流速的影响进行了讨论。特别是对流动聚焦装置和同向流动装置的性能进行了对比研究。结果表明,在一步流聚焦条件下,双乳液形成过程中出现了滴注和喷射两种状态,其中滴注状态包括同步滴注和非同步滴注两种不同的生成模式。从外界面的挤压导致内界面的崩溃在同步滴制度。形成制度,液滴的大小以及它们的多分散性由外部流体的流速决定,而壳厚度取决于中间流体和内部流体之间的流速比。与共流系统相比,流动聚焦系统中的流体动力学聚焦效应增强了界面的变形,其中实现了更快地生产具有更小尺寸的双重乳液。
Formation behaviors of double emulsions in the one-step axisymmetric flow-focusing microfluidic device are studied experimentally based on a visualization system. Typical droplet formation regimes are examined and the effects of the flow rates on droplet sizes and morphologies are discussed. Especially, a comparative study of the performance between the flow-focusing and co-flowing device is conducted. The results indicate that the dripping and jetting regimes appear during the double emulsion formation under one-step flow-focusing, in which the dripping regime includes two distinct generation modes namely synchronized dripping and asynchronized dripping. Squeezing from the outer interface leads to the collapse of the inner interface in the synchronized dripping regime. The formation regime, droplet sizes as well as their polydispersities are determined by the flow rate of the outer fluid, while the shell thickness depends on the flow rate ratio between the middle fluid and the inner fluid. Compared with the co-flowing system, deformation of the interfaces is enhanced by the hydrodynamic focusing effect in the flow-focusing system where faster production of double emulsions with smaller sizes is achieved.
DOI: 10.1016/s1369-7021(08)70053-1
发表时间: 2008-04-01
期刊: MATERIALS TODAY
影响因子: 24.2
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DOI: 10.1002/smll.200900569
发表时间: 2009-09-18
期刊: SMALL
影响因子: 13.3
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通讯作者: Weitz, D. A.