Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 26: Poster II

DY 26.20: Poster

Donnerstag, 26. März 2009, 16:00–18:00, P1A

Three-dimensional wave propagation in thin layers of a photosensitive BZ-medium — •Peter A. Kolski and Harald Engel — Technische Universität Berlin

In the past, a variety of wave phenomena including target pattern, spiral waves and chemical turbulence have been studied in thin transparent layers of the BZ medium. With a few exceptions [K. Showalter et. al. PRL 77 (15), 3244 (1996)], three-dimensional effects on wave propagation were neglected in the quasi two-dimensional experimental setup because of the small layer thickness. We will present experimental results demonstrating that under certain conditions even in thin layers (0.5-0.8 mm) scroll waves can be formed. They cause unexpected phenomena as reflective wave collision, wave splitting in response to external perturbation and formation of autonomous pacemakers. Three-dimensional numerical simulations with the underlying reaction-diffusion model have confirmed the three-dimensional mechanism responsible for the experimental observations.