论文标题
通过定向液滴散布在纤维上的膜涂料
Film coating by directional droplet spreading on fibers
论文作者
论文摘要
植物和昆虫使用细长的圆锥结构来运输和收集小滴，这些液滴由于毛细管作用而沿圆锥形结构推动。这些液滴在运动过程中可以沉积流体膜，但是尽管它对许多生物系统和工业应用重要性，但沉积膜的性质尚不清楚。我们通过开发渐近分析以及基于润滑方程的实验测量和数值模拟来表征膜沉积。我们表明，沉积的薄膜厚度显着取决于纤维半径和液滴尺寸，这强调了涂层受到与膜沉积相关的有限尺寸效应的影响。我们证明，通过更改液滴尺寸，而平均光纤半径和毛细管数是固定的，沉积膜的厚度可以通过数量级或更多的数量级变化。我们表明，自propelled液滴具有创建被动涂层结构的巨大潜力。
Plants and insects use slender conical structures to transport and collect small droplets, which are propelled along the conical structures due to capillary action. These droplets can deposit a fluid film during their motion, but despite its importance to many biological systems and industrial applications the properties of the deposited film are unknown. We characterise the film deposition by developing an asymptotic analysis together with experimental measurements and numerical simulations based on the lubrication equation. We show that the deposited film thickness depends significantly on both the fiber radius and the droplet size, highlighting that the coating is affected by finite size effects relevant to film deposition on fibres of any slender geometry. We demonstrate that by changing the droplet size, while the mean fiber radius and the Capillary number are fixed, the thickness of the deposited film can change by an order of magnitude or more. We show that self-propelled droplets have significant potential to create passively coated structures.
