Pinning of vortex rings and vortex networks in excitable systems
Florida State University, Department of Chemistry and Biochemistry - Tallahassee, FL 32306-4390, USA
Accepted: 17 August 2010
We investigate the effect of unexcitable obstacles on rotating scroll waves in three-dimensional excitable media. Our experiments use the autocatalytic Belousov-Zhabotinsky reaction and demonstrate that vortex filaments can be pinned to small, spherical obstacles. We find that single pinning sites increase the lifetime of collapsing vortex rings. Lifetimes and accompanying shape changes of the vortex filaments are well described by mean-curvature flow. We also create stationary networks of pinned filaments involving several pinning sites.
PACS: 05.45.-a – Nonlinear dynamics and chaos / 82.40.Ck – Pattern formation in reactions with diffusion, flow and heat transfer / 82.40.Qt – Complex chemical systems
© EPLA, 2010