Droplet transport on a cylindrical wire has applications in numerous fields such as fog collection, mist elimination, filtration, and oil/water separation. This work reports a droplet transport phenomenon on a superhydrophilic wire that shows a transient velocity powered not by the gradient of substrate geometry or wettability but primarily by the surface-to-kinetic energy transition that occurs along the axial direction upon coalescence. The transition efficiency is mainly limited by the viscous friction at the local liquid wedge, a relationship that a modified Ohnesorge number can capture.
Coalescence-induced propulsion of droplets on a superhydrophilic wire
Youhua Jiang, Leyun Feng, Allison O'Donnell, Christian Machado, Wonjae Choi, Neelesh A. Patankar, Kyoo-Chul Park; Coalescence-induced propulsion of droplets on a superhydrophilic wire. Appl. Phys. Lett. 5 December 2022; 121 (23): 231602. https://doi.org/10.1063/5.0124560
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