Front dynamics in an oscillatory bistable Belousov-Zhabotinsky chemical reaction.
We observe breathing front dynamics which select three distinct types of bistable patterns in the 2:1 resonance regime of the periodically forced oscillatory Belousov-Zhabotinsky reaction. We measure the curvature-driven shrinking of a circular domain R approximately t(1/2) at forcing frequencies below a specific value, and show that the fast time scale front oscillations (breathing) drive this slow time scale shrinking. Above a specific frequency, we observe fronts of higher curvature grow instead of shrink and labyrinth patterns form. Just below the transition frequency is a relatively narrow range of frequencies where the curvature-driven coarsening is balanced by a competing front interaction, which leads to a pattern of localized structures. The length scale of the localized structure and labyrinth patterns is set by the front interactions.
Marts
Bradley
B
Center for Nonlinear and Complex Systems and Department of Physics, Duke University, Durham, North Carolina 27708, USA.
Martinez
Karl
K
Lin
Anna L
AL