(99b) New Twists in the Electrohydrodynamics of Viscous Drops

A classic result due to G.I.Taylor is that a weakly conducting drop bearing zero net charge placed in a uniform electric field adopts a prolate or oblate spheroidal shape, the flow and shape being axisymmetrically aligned with the applied field. Here I will overview some intriguing novel flows due to symmetry--breaking instabilities (Quincke rotation resulting in drop steady tilt or tumbling, and pattern formation on the surface of a particle-coated drop), toroidal drop formation and break-up, and the streaming from the drop equator that creates visually striking “Saturn-rings” around the drop.