Instabilities in Toroidal Droplets
Abstract: Toroidal droplets transform into spherical droplets to minimize their surface area. They do so by either breaking via the Rayleigh-Plateau instability or by shrinking; in the latter case, the “hole” progressively disappears to eventually result in the formation of a single spherical droplet. Shrinking is always present for uncharged toroidal droplets due to the variation of the Laplace pressure around the circular cross-section of the torus. The presence of charge, however, can qualitatively change this behavior and result in the expansion of the torus; this happens as a result of the electric stress on the surface, which competes and opposes the surface tension stress. In this talk, we will discuss these and other instabilities in toroidal droplets. We will end by discussing how to prevent them all and stabilize the toroidal shape; we achieve this using yield-stress materials, in what can be seen as a way to 3D print.
Bio: B.S, M.S and Phd - U Granada (Spain). Post-doc, Harvard, with David Weitz, 2001-2002. Lecturer, U Almeria (Spain), 2003-2004. INEST Visiting Professor, Harvard, with David Weitz, 2005-2007. Georgia Tech, 2008-present. Now Associate Professor.
All seminars are held on Wednesdays from 12:00 noon-1:00 p.m. in the Bowen Hall Auditorium Room 222. A light lunch is provided at 11:30 a.m. in the Bowen Hall Atrium immediately prior to the seminar.