液滴在孔隙中流动的颗粒界面的稳定性
Stability of particle laden interfaces of drops flowing through a pore
摘要：
当载有固体颗粒并悬浮在液体中的液滴通过窄孔时，其界面经历强烈的剪切和拉伸，并且颗粒筏可能朝向液滴的后部积聚。使用在设定压力下驱动的Pickering液滴的良好控制的公式，我们确定了Pickering液滴通过会聚-发散孔隙后固体颗粒从油-水界面排出的两个条件：（i）颗粒在液滴后部的积聚使得表面压力在界面处积聚。(ii)屈曲引起的表面压力松弛受几何约束的影响。这两个条件是合理化使用三个无量纲数：毛细管数，颗粒的孔径比，和滴粒径比，这允许占界面处的粘性剪切，孔壁和滴之间的润滑膜的稳定性，在界面处吸附的颗粒筏上的阻力，和它的机械行为。
英文摘要：
When a drop laden with solid particles and suspended in a liquid passes through a narrow pore, its interface experiences strong shear and elongation, and the raft of particles may accumulate toward the back of the drop. Using well controlled formulations of Pickering drops driven at set pressure, we determine the two conditions for which solid particles are expelled from the oil-water interface after a Pickering drop passes a converging-diverging pore: (i) particles accumulation at the rear of the drop is such that surface pressure builds-up at the interface. (ii) Surface pressure relaxation by buckling is impaired by geometrical constraints. These two conditions are rationalized using three non dimensional numbers: the capillary number, the particle to pore size ratio, and the drop to particle size ratio, which allow to account for the viscous shear at the interface, the stability of the lubricating film between the pore wall and the drop, the drag on the raft of particles adsorbed at the interface, and its mechanical behaviour.
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