Regensburg 2016 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 46: Poster: Wetting, Nano- and Microfluidics

DY 46.9: Poster

Mittwoch, 9. März 2016, 18:15–21:00, Poster B2

Onset of motion of a sliding droplet — Simeon Völkel and •Kai Huang — Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany

We investigate experimentally the onset of motion of a water drop on an inclined plane with contact angle hysteresis. The onset of motion is triggered either through increasing the volume of the drop with an inkjet printer head or through tilting the plane with a stepper motor. Based on an analysis of both top view and side view images, we explore the evolution of the drop shape with time in the vicinity of the depinning transition and discuss how different ways to trigger the motion influence the bifurcation scenario of the transition. Finally, we analyze the eccentricity of the drop as a function of bond number that measures the ratio of gravitational forces to surface tension forces and compare our results with numerical simulations.