打破茶壶效应
Beating the teapot effect
摘要：
本文研究了在惯性流状态下，液体在固体表面上的滴落现象，这种现象通常被称为“茶壶效应”。我们表明，表面润湿性是一个意想不到的关键因素，在控制流分离和滴水，后者被完全抑制在超疏水基板的限制。这种不可预见的耦合是合理的一种新的水毛细粘附框架，耦合惯性流表面润湿性的影响。这种流动分离的描述成功地捕捉到了所观察到的依赖于各种实验参数-润湿性，流速，固体表面边缘曲率。作为这种耦合的进一步说明，使用用于接触角致动的电润湿来展示对滴落的实时控制。
英文摘要：
We investigate the dripping of liquids around solid surfaces in the regime of inertial flows, a situation commonly encountered with the so-called "teapot effect". We demonstrate that surface wettability is an unexpected key factor in controlling flow separation and dripping, the latter being completely suppressed in the limit of superhydrophobic substrates. This unforeseen coupling is rationalized in terms of a novel hydro-capillary adhesion framework, which couples inertial flows to surface wettability effects. This description of flow separation successfully captures the observed dependence on the various experimental parameters - wettability, flow velocity, solid surface edge curvature-. As a further illustration of this coupling, a real-time control of dripping is demonstrated using electro-wetting for contact angle actuation.
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