Droplet capture by complex fiber networks such as fog nets can greatly increase water security in communities with little to no rainfall. Here we investigate the sliding motion of a single droplet dispensed onto two adjacent vertical fibers that are either parallel or twisted together. By twisting fibers we find that we can passively control a drop's shape, flow pattern and transport velocity, all without changing the fiber's diameter, the fiber's material or any of the drop's properties (volume, viscosity, surface tension, density).
This work was funded by the Research Council of Norway through the program NANO2021, Project No. 301138.
Music Credit: In the Hall of the Mountain King by Edvard Grieg, performed by the Czech National Symphony Orchestra, produced and released under the creative commons licence, music in the public domain. https://musopen.org/music/777-peer-gynt-suite-no-1-op-46/#recordings
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