This review describes recent progress in the fundamental understanding of deformable drop motion through porous media with well-defined microstructures, through rigorous first-principles hydrodynamical simulations and experiments. Tight squeezing conditions, when the drops are much larger than the pore throats, are particularly challenging numerically, as the drops nearly coat the porous material skeleton with small surface clearance, requiring very high surface resolution in the algorithms. Small-scale prototype problems for flow-induced drop motion through round capillaries and three-dimensional (3D) constrictions between solid particles, and for gravity-induced squeezing through round orifices and 3D constrictions, show how forcing above critical conditions is needed to overcome trapping. Scaling laws for the squeezing time are suggested. Large-scale multidrop/multiparticle simulations for emulsion flow through a random granular material with multiple drop breakup show that the drop phase generally mov...

中文翻译：

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可变形液滴通过多孔介质的运动

这篇综述描述了通过严格的第一性原理流体动力学模拟和实验，通过具有明确微结构的多孔介质对可变形液滴运动的基本理解的最新进展。当液滴比孔喉大得多时，紧挤压条件在数值上尤其具有挑战性，因为液滴几乎覆盖了具有小表面间隙的多孔材料骨架，因此算法中需要非常高的表面分辨率。流动诱导液滴运动通过圆形毛细管和固体颗粒之间的三维 (3D) 收缩的小规模原型问题，以及通过圆形孔口和 3D 收缩的重力诱导挤压，展示了如何强制超过临界条件来克服捕获. 建议了挤压时间的比例法则。