Joint CNCS/Applied Math Seminar
Tuesday, March 31, 1998, 2:15pm, 05 Physics
Simon Tavener (Pennsylvania State University, Dept of Math)
Convective Effects on a Propagating Reaction Front
Abstract:- Unstable concentration gradients inherent in traveling chemical waves can give rise to buoyancy driven convection, altering the speed of the wave. When an excitable Belousov-Zhabotinsky reaction system is confined within a sufficiently narrow, vertical two dimensional channel, convection arises at a symmetry-breaking bifurcation point. The observed linear rate of change of wave speed with the bifurcation parameter is shown to be a necessary consequence of the Z_2 symmetry present. Contrary to our expectations, convection has been found to decrease the speed of the wave in certain regions of parameter space and a simple explanation can be given.
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