Flow patterns of solid in water in oil (S/W/O) compound droplets formation in a microfluidic device with perpendicular shear
Flow patterns of solid in water in oil (S/W/O) compound droplets formation in a microfluidic device with perpendicular shear
复制标题
垂直剪切微流体装置中油包水 (S/W/O) 复合液滴形成固体的流动模式
DOI：
10.1016/j.jiec.2019.03.020
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发表时间：
2019-07
影响因子：
6.1
通讯作者：
Bo Li
中科院分区：
文献类型：
--
作者：
Dawei Pan;Qiang Chen;Lan Xu;Can Yang;Meifang Liu;Weixing Huang;Bo Li
在微流控装置上实验研究了垂直剪切力作用下油类复合液滴中水中固体的流动模式及相应的破碎动力学。通过连续相的毛细数（Cac）和连续相与分散相的流量比(R)，对连续相的双包封、堵塞和鹅卵石三种典型的流动形态进行了定量区分。研究发现，在所有流动形式下，固体颗粒的连续进入导致δ1（沿侧通道中心的颈厚）呈周期性变化。在双包封状态下，第一和第二颗粒之间的颈厚δ2随着界面张力作用下界面变形的恢复而增大，而第二和第三颗粒之间的颈厚δ3由于颈长拉伸而变得足够薄而减小至断裂。对于卵石层，静水压力差仍然占主导地位，但剪切力不再起作用。特别的是，不同于W/O液滴形成的是，各种破碎动力学总是由S/W界面的非自由变形和大直径的固体颗粒引起的。最后，得到了依赖于canandrare的流型图。
The flow patterns and corresponding breakup dynamics of solid in water in oil compound droplets under perpendicular shear force were experimentally investigated in a microfluidic device. Three typical flow patterns, namely double-encapsulation, plugs, and cobbles, were found and be quantitatively distinguished by the capillary number (Cac) of continuous phase and the flow rate ratio (R) of continuous phase to dispersed phase. It is found that, under all of flow regimes, the consecutive entry of solid particles leadsδ1(the neck thickness along the center of the side channel) varying periodically. In the double-encapsulation regime, the neck thickness (δ2) between the first and second particle increases as the interface deformation recovers driven by the interfacial tension force, whereas the neck thickness (δ3) between the second and third particle decreases to break off because the neck has been stretched long to become thin enough. As for the cobbles regime, hydrostatic pressure difference still remains dominant, but not a shearing force. Specially, different from the W/O droplet formation, it suggests that various breakup dynamics are always caused by a non-free deformation of S/W interface and the large diameter of solid particle. Finally, the flow pattern diagrams dependent onCacandRare obtained.
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DOI：
10.1021/la804173b
发表时间：
2009-02
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
Fei Gao;Z. Su;Ping Wang;G. Ma
通讯作者：
Fei Gao;Z. Su;Ping Wang;G. Ma
影响因子：
0.8
作者：
Y. Mahdi;K. Daoud;L. Tadrist
通讯作者：
Y. Mahdi;K. Daoud;L. Tadrist
影响因子：
32.5
作者：
Wang, Xiaolei;Li, Ge;Chen, Zhongwei
通讯作者：
Chen, Zhongwei
影响因子：
8.6
作者：
Shum, Ho Cheung;Bandyopadhyay, Amit;Weitz, David A.
通讯作者：
Weitz, David A.
双同轴毛细管装置中毫米级空心聚合物球双乳液的控制生产
影响因子：
4.7
作者：
Shao, Ting;Feng, Xuelan;Cheng, Yi
通讯作者：
Cheng, Yi