微结构化疏水表面上的液滴弹跳和跳跃
Droplet bouncing and skipping on microstructured hydrophobic surfaces
摘要：
通过高速成像研究了不同疏水性表面上的液滴射流的影响。利用由不同尺寸和间距的圆柱形柱组成的硅酮表面上的微结构来增强疏水性。与这些微结构化表面的冲击后的液滴运动的比较与普通玻璃（亲水性）和平坦的有机硅表面所指出的形成对比。流体动力学视频以6000 fps捕获，并在1.35 cm（高）X 2.7 cm（宽）的视场内以30 fps回放，该视场用LED阵列进行背照，用于800微米直径的液滴以2.5 m/s的速度以38度的入射角（相对于表面）撞击表面。对于玻璃和非结构化硅树脂情况，撞击后液滴的弹跳不明显，尽管在后一种情况下观察到许多液滴沿着表面滚动，这与其略微疏水的性质一致。相比之下，发现液滴在撞击微结构化表面时跳跃和弹跳，这表明由于这些表面特征，疏水性显著增强。
英文摘要：
The impact of a jet of droplets upon surfaces of varying hydrophobicity is studied via high-speed imaging. Microstructures on silicone surfaces consisting of cylindrical pillars of varying sizes and spacings are utilized to enhance hydrophobicity. Comparison of droplet motion after impact with these microstructured surfaces is contrasted with that noted for plain glass (hydrophilic) and flat silicone surfaces. Fluid dynamics videos are captured at 6000 fps and played back at 30 fps over a field of view of 1.35 cm (height) X 2.7 cm (width) that is back-illuminated with an LED array for 800-micron diameter droplets impinging the surfaces at 2.5 m/s with an angle of incidence of 38 degrees (relative to the surface). Bouncing of droplets after impact is not apparent for the glass and unstructured silicone cases, though many droplets were observed to roll along the surface in the latter case which is consistent with its slightly hydrophobic nature. In contrast, droplets were found to both skip and bounce upon impacting the microstructured surfaces which indicates a significant enhancement in hydrophobicity due to these surface features.
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