论文标题
流过毛孔的液滴的粒子界面的稳定性
Stability of particle laden interfaces of drops flowing through a pore
论文作者
论文摘要
当滴入固体颗粒并悬浮在液体中的液滴穿过狭窄的孔时，其界面会经历较强的剪切和伸长，并且颗粒筏可能会朝向滴的背面积聚。使用在固定压力下驱动的采取液滴的良好控制的配方，我们确定了在皮克林滴下固体颗粒从油水界面中排出的两个条件，通过收敛的散布孔：（i）滴在液滴后部的颗粒积聚在界面处的表面压力在界面处堆积。 （ii）屈曲的表面压力松弛会受到几何约束的损害。这两个条件使用三个非维数数字合理化：毛细管数，粒子与孔径比以及粒度比的下降，可以考虑界面处的粘性剪切，孔隙壁和滴度之间的润滑膜的稳定性，滴剂和粒子的阻力在界面上的阻力，并在界面上贴上界面和机械的机械行为。
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.
