Kern Vanessa R, Carlson Andreas
Niels Henrik Abels Hus, Department of Mathematics, Mechanics Section, University of Oslo, Oslo 0851, Norway.
Proc Natl Acad Sci U S A. 2024 Aug 6;121(32):e2402252121. doi: 10.1073/pnas.2402252121. Epub 2024 Jul 29.
Drop-fiber interactions are fundamental to the operation of technologies such as atmospheric fog capture, oil filtration, refrigeration, and dehumidification. We demonstrate that by twisting together two fibers, a sliding drop's flow path can be controlled by tuning the ratio between its size and the twist wavelength. We find both experimentally and numerically that twisted fiber systems are able to asymmetrically stabilize drops, both enhancing drop transport speeds and creating a rich array of new flow patterns. We show that the passive flow control generated by twisting fibers allows for woven nets that can be "programmed" with junctions that predetermine drop interactions and can be anticlogging. Furthermore, it is shown that twisted fiber structures are significantly more effective at capturing atmospheric fog compared to straight fibers.
液滴与纤维的相互作用对于诸如大气雾气收集、油过滤、制冷和除湿等技术的运行至关重要。我们证明，通过将两根纤维捻合在一起，可以通过调节液滴大小与捻度波长之间的比例来控制滑动液滴的流动路径。我们通过实验和数值模拟都发现，捻合纤维系统能够不对称地稳定液滴，既提高了液滴传输速度，又创造了一系列丰富的新流动模式。我们表明，纤维捻合产生的被动流动控制使得编织网能够通过预先确定液滴相互作用的节点进行“编程”，并且具有防堵塞功能。此外，研究表明，与直纤维相比，捻合纤维结构在捕获大气雾气方面显著更有效。
