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DY: Fachverband Dynamik und Statistische Physik

DY 54: Poster: Complex, Fluids, Glasses, Granular

DY 54.9: Poster

Donnerstag, 4. April 2019, 15:00–18:00, Poster B2

Electrohydrodynamic instabilities of droplets suspended in highly viscous liquids — Sebastian Rühle, •Martin Brinkmann, and Ralf Seemann — Experimental Physics, Saarland University

Motivated by recent experimental results we study electroconvective flows in poorly conducting droplets that are suspended in an ambient liquid with high viscosity and conductivity. The coupled electrostatic and Stokes problem for a homogeneous external field is solved numerically for both 2d and axially symmetric 3d droplets using a boundary element approach. A number of dynamical flow regimes and instabilities are observed whose appearance is controlled by the contrast of viscosity, conductivity, and dielectric permittivity, as well as the magnitude of the applied field. If the timescale of charging or discharging of the 2d droplets is comparable or larger than the timescale of flow, the droplets may display transient shape oscillations and rotational flows.