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*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


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.

Original languageEnglish
Article number231602
JournalApplied Physics Letters
Issue number23
StatePublished - 5 Dec 2022
Externally publishedYes


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