Deformation and breakup of high-viscosity droplets with symmetric microfluidic cross flows
Deformation and breakup of high-viscosity droplets with symmetric microfluidic cross flows
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DOI：
10.1103/physreve.80.026307
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发表时间：
2009-08-01
影响因子：
2.4
通讯作者：
Cubaud, Thomas
中科院分区：
文献类型：
--
作者：
Cubaud, Thomas
实验研究了方形微通道中高粘性液滴对周围液体流速急剧增加的动态响应。连续相从对称侧通道局部注入到一列液滴上，在液滴的前部和后部之间产生大的速度对比，产生宽范围的时间依赖性变形和破碎。特别是，由于微尺度限制，系统显示出与初始液滴尺寸的非线性行为。变形，弛豫时间，和破碎过程作为流动参数和流体性质的函数进行检查，重点是形成细长的粘性结构，如勺形液滴，即，不对称液滴。
The dynamic response of highly viscous droplets to a sharp increase in the surrounding liquid velocity is experimentally investigated in a square microchannel junction. The local injection of the continuous phase from symmetric side channels onto a train of droplets produces a large velocity contrast between the front and the rear of droplets, yielding a broad range of time-dependent deformation and breakup. In particular, due to microscale confinement, the system displays a nonlinear behavior with the initial droplet size. Deformations, relaxation times, and fragmentation processes are examined as a function of flow parameters and fluids properties with emphasis on the formation of slender viscous structures such as spoon-shaped droplets, i.e., asymmetrical droplets.