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首页> 外文期刊>International Journal of Heat and Mass Transfer >Droplet condensation and jumping on structured superhydrophobic surfaces
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Droplet condensation and jumping on structured superhydrophobic surfaces

机译：液滴凝结并在结构超疏水表面上跳跃

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摘要

A complete cycle of droplet nucleation, growth, coalescence and jumping on different textured hydrophobic and superhydrophobic surfaces is studied for the first time, using a 2-D double distribution function thermal lattice Boltzmann method. First, droplet nucleation mechanism on smooth and rough surfaces is studied in detail. The results reveal the presence of cooled vapor layer instability in the condensation on completely smooth surfaces. However, on the rough surfaces and near the roughness a completely different mechanism is observed and the nucleation occurs on the roughness wedges. Also, the condensation on different textured surfaces with nominal contact angles theta(a) = 90 degrees, 120 degrees, 155 degrees is studied. On all these surfaces it is observed that for small textures the nucleation occurs normally near the structure wedges. However, increasing the height of the textures displaces the nucleation sites to the top of the structure, near the structure edge. After growing the droplets different behaviors are observed for different contact angles, i.e., the Wenzel or suspended droplets are formed and the droplets even jump out. Moreover, based on the non-dimensional numbers a complete study of droplet jumping is carried out and a method for proper designing the textured surfaces is presented. Finally, the benefits of using hybrid textured surfaces and the mechanism of droplet jumping on these surfaces are explained. (C) 2019 Elsevier Ltd. All rights reserved.
机译：使用二维双分布函数热晶格玻尔兹曼方法，首次研究了液滴在不同纹理的疏水性和超疏水性表面上成核，生长，聚结和跳跃的完整循环。首先，详细研究了在光滑和粗糙表面上的液滴成核机理。结果表明在完全光滑的表面上的冷凝中存在冷却的蒸汽层不稳定性。但是，在粗糙表面和接近粗糙度的地方，观察到了完全不同的机理，并且在粗糙度楔形体上发生了形核。同样，研究了在不同纹理表面上的名义接触角theta（a）= 90度，120度，155度的冷凝。在所有这些表面上，可以观察到，对于小纹理，成核通常发生在结构楔附近。但是，增加纹理的高度会将成核位置移到结构顶部，靠近结构边缘。在使液滴生长之后，对于不同的接触角观察到不同的行为，即，形成Wenzel或悬浮的液滴，并且液滴甚至跳出。此外，基于无量纲数，对液滴跳跃进行了完整的研究，并提出了正确设计纹理表面的方法。最后，解释了使用混合纹理表面的好处以及液滴在这些表面上跳跃的机制。 （C）2019 Elsevier Ltd.保留所有权利。

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