Regensburg 2019 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

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

DY 54.10: Poster

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

Fast calculation method for determining the shape of static liquid/liquid or liquid/vapor interfaces under the influence of electrical fields — •Sebastian Bohm and Erich Runge — Technische Universität Ilmenau, FG. Theoretische Physik 1, Weimarer Straße 25, 98693 Ilmenau

Due to the constant trend towards smaller systems new methods for the manipulation of liquids on the micro-scale are required. One important and frequently used technique to manipulate liquids on small scales is the so called Electrowetting-on-Dielectrics (EWOD) effect. EWOD based microfluidic devices provide high-throughput platforms for a wide range of applications in biology, chemistry and nanotechnology. For the design and optimization of such devices, the shape of liquid/vapor or liquid/liquid interfaces needs to be determined. However, the numerical simulation presents a great challenge due to the coupling of fluidics and electrodynamics.

This work reports a new and fast method for the determination of the shape of static three-dimensional interfaces under the influence of electrical fields. Additionally, the influence of interface effects and gravity are considered. The simulation also allows to determine the shape of the interface near the contact line with high accuracy and verify that the local contact angle at the contact line is voltage independent. The simulation results are confirmed by EWOD experiments on systems with different geometries.