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Journal Article

Capillary droplet propulsion on a fibre

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Bäumchen,  Oliver
Group Dynamics of fluid and biological interfaces, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Haefner, S., Bäumchen, O., & Jacobs, K. (2015). Capillary droplet propulsion on a fibre. Soft Matter, 11(35), 6921-6926. doi:10.1039/c5sm01228g.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-5EE7-8
Abstract
A viscous liquid film coating a fibre becomes unstable and decays into droplets due to the Rayleigh–Plateau instability (RPI). Here, we report on the generation of uniform droplets on a hydrophobized fibre by taking advantage of this effect. In the late stages of liquid column breakup, a three-phase contact line can be formed at one side of the droplet by spontaneous rupture of the thinning film. The resulting capillary imbalance leads to droplet propulsion along the fibre. We study the dynamics and the dewetting speed of the droplet as a function of molecular weight as well as temperature and compare to a force balance model based on purely viscous dissipation.