论文标题
剪切下的多核形态浓缩相乳液：一项数值研究
Concentrated phase emulsion with multi-core morphology under shear: A numerical study
论文作者
论文摘要
我们在数值上研究了限制在微流体通道内的多核形态的浓缩相位乳液的对称剪切流中的动态行为。报道了各种新的非平衡稳态。在较低的剪切速率下，发现乳液表现出固体样的行为，其中岩心显示出具有近似角速度的周期性行星样运动。在较高的剪切速率下，两个稳态出现，一个稳态沿着流动对齐，本质上是一动不动的，而另一些核心在外部界面附近积累了一个稳态，并产生动态的椭圆形环链，让人联想到跑步台面的结构，而另一些则占据了乳液中心。还提供了关于核心运动的定量描述，ii）乳液的变形速率和iii）通道内流体流的结构。
We numerically study the dynamic behavior under a symmetric shear flow of selected examples of concentrated phase emulsions with multi-core morphology confined within a microfluidic channel. A variety of new nonequilibrium steady states is reported. Under low shear rates, the emulsion is found to exhibit a solid-like behavior, in which cores display a periodic planetary-like motion with approximately equal angular velocity. At higher shear rates two steady states emerge, one in which all inner cores align along the flow and become essentially motionless and a further one in which some cores accumulate near the outer interface and produce a dynamical elliptical-shaped ring chain, reminiscent of a treadmilling-like structure, while others occupy the center of the emulsion. A quantitative description in terms of i) motion of the cores, ii) rate of deformation of the emulsion and iii) structure of the fluid flow within the channel is also provided.
