Dresden 2011 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 30: Reaction-Diffusion Systems

DY 30.6: Vortrag

Donnerstag, 17. März 2011, 11:30–11:45, ZEU 118

Dynamics of scroll rings interacting with boundaries — •Arash Azhand, Peter Kolski, and Harald Engel — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

Undamped propagation of three-dimensional travelling waves has been observed in a variety of dissipative active media including chemical waves, temperature waves in solid fuel combustion and waves of electric activity during cardiac arrhythmias, for example. Here, we present experimental and numerical results for the dynamics of scroll rings in thin layers of the photosensitive Belousov-Zhabotinsky reaction. The study is focused on boundary effects that modify the intrinsic dynamics of the scroll ring under these geometrically confined conditions. The experimental findings are compared to results obtained by numerical simulations with the underlying Oregonator model. The reported results do not depend, however, on a particular kinetics but apply to a large class of excitable media.