Surface tension forces enable a liquid to rise against gravity when wettable tubes or porous media are in contact with the pool of liquid. While the rise dynamics in the media of homogeneous porosity are well known, those in heterogeneous porous media still remain poorly understood. Here, we employ a vertical channel formed by two parallel plates decorated with micropillars, as a simple model of bidisperse porous media, and observe the rise dynamics of various viscous liquids. We find the bulk rise speed to be higher than that in dry smooth channels but equal to that between prewetted smooth channels. As the bulk approaches its equilibrium height, a film emerges ahead of the bulk meniscus, which is driven by the high surface energy of the microdecorated surface. The film extension grows initially like t but later like t1/2, with t being time. We construct theoretical models to predict the critical height where the film emerges and to rationalize the power laws of the film extension. In particular, we show...

中文翻译：

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超亲水粗糙通道中的毛细管上升

当可湿性管或多孔介质与液体池接触时，表面张力使液体能够克服重力上升。虽然均质孔隙介质中的上升动力学众所周知，但非均质多孔介质中的上升动力学仍然知之甚少。在这里，我们采用由两个装饰有微柱的平行板形成的垂直通道作为双分散多孔介质的简单模型，并观察各种粘性液体的上升动力学。我们发现整体上升速度高于干燥光滑通道，但等于预湿光滑通道之间的体积上升速度。当体块接近其平衡高度时，在体块弯液面之前出现一层薄膜，这是由微装饰表面的高表面能驱动的。薄膜扩展最初像 t 一样增长，但后来像 t1/2 一样，t 是时间。我们构建理论模型来预测电影出现的临界高度并使电影延伸的幂律合理化。特别是，我们展示...