Regensburg 2016 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 48: Wetting, Nano- and Microfluidics I (joint session CPP/DY)
DY 48.3: Vortrag
Donnerstag, 10. März 2016, 10:15–10:30, H42
Rayleigh-Plateau Instability and Capillary Droplet Propulsion on a Fiber — •Sabrina Haefner1,2, Michael Benzaquen3, Oliver Bäumchen2,4, Thomas Salez3, Robert Peters2, Joshua McGraw1, Elie Raphaël3, Kari Dalnoki-Veress2,3, and Karin Jacobs1 — 1Saarland University, Dept. of Experimental Physics, D-66041 Saarbrücken, Germany — 2McMaster University, Dept. of Physics & Astronomy, Hamilton, ON, Canada — 3PCT Lab, UMR CNRS 7083 Gulliver, ESPCI ParisTech, PSL Research University, Paris, France — 4Max-Planck Institute for Dynamics & Self-Organization (MPIDS), 37077 Göttingen, Germany
The Rayleigh-Plateau instability (RPI) of a liquid column underlies a variety of hydrodynamic phenomena. Compared to the classical case of a free liquid column, the description of a liquid layer on a fiber requires the consideration of the solid/liquid interface in addition to the free surface. We revisit the RPI of a liquid layer on a solid fiber by varying the hydrodynamic boundary condition at the fiber/liquid interface from no-slip to slip. We find that the growth rate depends on the system geometry and the boundary condition, which is in agreement with theory [1]. In the late stages of liquid column breakup on slip-fibers, a three-phase contact line can be formed on one side of the droplet. The resulting capillary imbalance leads to droplet propulsion, which is studied as a function of temperature and molecular weight [2].
[1] S. Haefner et al., Nat. Commun., 6 (2015), 7409.
[2] S. Haefner et al., Soft Matter, 11, (2015), 6921.