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Aerodynamics-assisted, efficient and scalable kirigami fog collectors
Nature Communications ( IF 16.6 ) Pub Date : 2021-09-16 , DOI: 10.1038/s41467-021-25764-4
Jing Li 1 , Ranjiangshang Ran 2 , Haihuan Wang 1 , Yuchen Wang 1 , You Chen 3 , Shichao Niu 3 , Paulo E Arratia 2 , Shu Yang 1
Affiliation  

To address the global water shortage crisis, one of the promising solutions is to collect freshwater from the environmental resources such as fog. However, the efficiency of conventional fog collectors remains low due to the viscous drag of fog-laden wind deflected around the collecting surface. Here, we show that the three-dimensional and centimetric kirigami structures can control the wind flow, forming quasi-stable counter-rotating vortices. The vortices regulate the trajectories of incoming fog clusters and eject extensive droplets to the substrate. As the characteristic structural length is increased to the size of vortices, we greatly reduce the dependence of fog collection on the structural delicacy. Together with gravity-directed gathering by the folds, the kirigami fog collector yields a collection efficiency of 16.1% at a low wind speed of 0.8 m/s and is robust against surface characteristics. The collection efficiency is maintained even on a 1 m2 collector in an outdoor setting.



中文翻译:

空气动力学辅助、高效且可扩展的剪纸雾收集器

为了解决全球水资源短缺危机,从雾等环境资源中收集淡水是一种有前景的解决方案。然而,由于在收集表面周围偏转的充满雾的风的粘性阻力,传统的雾收集器的效率仍然很低。在这里,我们展示了三维和厘米的剪纸结构可以控制风流,形成准稳定的反向旋转涡流。涡流调节进入雾团的轨迹并将大量液滴喷射到基材上。随着特征结构长度增加到漩涡大小,我们大大降低了雾收集对结构精细度的依赖。连同重力导向的褶皱聚集,剪纸在 0.8 m/s 的低风速下,雾气收集器的收集效率为 16.1%,并且对表面特性具有很强的抵抗力。即使在室外环境中使用 1 m 2收集器也能保持收集效率。

更新日期:2021-09-16
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