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Electrowetting on Dielectric

The ability to manipulate fluids at the micro-scale is an important tool in the area of bio-medical applications. Micro-fluidic devices often exploit surface tension forces to actuate or control liquids by taking advantage of the large surface-to-volume ratios found at the micro-scale. In particular, some MEMS (micro-electro-mechanical system) devices use electro-wetting which effectively modifies surface tension effects through the use of electric fields, which allows for the manipulation of fluid droplets.
Time evolution of splitting of a droplet. Experiment (blurry line, courtesy Kim's Lab (UCLA)) vs Simulation (dashed line).
We use a model (Nochetto, Shapiro and Walker) that predicts fluid dynamics in electrowetting systems. It includes fluid dynamics, topology changes (droplet splitting and merging), saturation, hysteresis, and they numerically resolve a phenomenalogical model of contact line pinning (so they include interface pinning).

Collaborators

Prof. Ricardo H. Nochetto (UMD)
Prof. Shawn W. Walker (LSU)

Some Numerical Simulations

Given the electric potential, we are able to predict the dynamic of the droplet and simulate splitting. Click on pictures to animate (might take some time to load).