Physics Colloquium: Barriers to front propagation and active transport in laminar fluid flows

Tom Solomon, Department of Physics,  Bucknell University

Abstract: We present experiments on the effects of vortex-dominated flows on the spreading of the excitable Belousov-Zhabotinsky chemical reaction and on the motion of bacteria. The results of these experiments have applications for a wide range of systems including microfluidic chemical reactors, cellular-scale processes in biological systems, and blooms of phytoplankton in the oceans. To predict the behavior of reaction fronts, we adapt tools used to describe chaotic fluid mixing in laminar flows.In particular, we propose "burning invariant manifolds" (BIMs) that act as one-way barriers that locally block the motion of reaction fronts and "smooth swimming" bacillus subtilus.  These ideas are tested and illustrated experimentally in a chain of alternating vortices, a spatially-random flow, vortex flows with imposed winds, a three-dimensional, nested vortex flow, and a hyperbolic microfluidic flow. 

Tuesday, October 10 at 3:15pm

Regents Hall, 109
3700 O St. NW

Event Type

Research

Departments

Georgetown College, Physics, Institute for Soft Matter Synthesis and Metrology

Tags

colloquium

Presenter

Tom Solomon

Event Contact Name

Jeffrey Urbach

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