COLLOQUIUM
3:00 p.m., Friday (October 12, 2007)
Math Annex 1100
James Feng
UBC
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 finiteelement computations of the dynamics
of the defects. Results show a flowinduced transition from the socalled 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).
