Monday, March 12, 2018 - 11:30am - 12:20pm
David Saintillan (University of California, San Diego)
Weakly conducting dielectric solid particles and liquid droplets in strong electric fields are known to undergo symmetry-breaking bifurcations leading to steady electrorotation. This so-called Quincke effect, which results from the antiparallel electrostatic dipole induced by the applied field inside the particles, is well described by the classic Taylor-Melcher leaky dielectric model.
Monday, March 12, 2018 - 9:00am - 9:50am
Michael Miksis (Northwestern University)
Recent experiments show intriguing surface patterns when a uniform electric field is applied to a droplet covered with colloidal particles. Depending on the particle properties and the electric field intensity, particles organize into an equatorial belt, pole-to-pole chains, or dynamic vortices. Here we present simulations of the collective particle dynamics, which account for electrohydrodynamic and dielectrophoresis of particles.
Tuesday, March 13, 2018 - 9:00am - 9:50am
Aditya Khair (Carnegie Mellon University)
The deformation of a weakly conducting, leaky dielectric, prolate drop in a density matched, immiscible weakly conducting medium under a uniform DC electric field is analyzed. Using boundary integral computations, we delineate drop deformation and breakup regimes in the Ca_E-Re_E parameter space, where Ca_E is the electric capillary number (ratio of the electric to capillary stresses); and Re_E is the electric Reynolds number (ratio of charge relaxation to flow time scales), which characterizes the strength of surface charge convection along the interface.
Wednesday, March 28, 2018 - 9:00am - 9:30am
Omar Matar (Imperial College London)
The evaporation of a binary mixture pool or droplet is a highly dynamic and complex process involving thermal and solutal Marangoni-driven flow. Experiments on ethanol/water drops have identified chaotic regimes on both the surface and interior of the droplet; mixture composition has also been seen to govern drop wettability. Using lubrication theory-based approaches, and fully-numerical simulations, we present results for two distinct cases.
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