3:00 p.m., Friday (October 12, 2007)
Math Annex 1100
Defect dynamics near bubbles and drops rising in a liquid crystal: observations and computations
Abstract: In this lecture, I describe experimental observations and numerical
simulations of orientational defects surrounding bubbles and drops in nematic
liquid crystals. I will describe a mathematical model that captures the coupling
among bulk molecular orientation, surface anchoring, interfacial morphology and
external flow fields. This is used in finite-element computations of the dynamics
of the defects. Results show a flow-induced transition from the so-called Saturn
ring defect to a satellite point defect, in close agreement with observations.
Refreshments will be served at 2:45 p.m. in the Faculty Lounge,
Math Annex (Room 1115).