Berlin 2005 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 34: Poster

DY 34.28: Poster

Montag, 7. März 2005, 15:30–18:00, Poster TU D

A tomographic study of a meandering scroll wave in a chemical excitable media — •Chaiya Luengviriya, Ulrich Storb, and Stefan C. Müller — Otto-von-Guericke-Universität, Institut für Experimentelle Physik, Universitätsplatz 2, D-39106 Magdeburg

The behavior of a meandering scroll wave in a ferroin-catalyzed MA-BZ reaction solution embedded in agarose gel is studied by optical tomographic observation with a parallel beam technique. The chemical recipe for the meandering case with extremely low wave velocity (less than 25 um/s) is firstly obtained from a 2D experiment with a special oxygen-free 2D reactor.In the 2D case the media supports a meandering spiral wave at the beginning of the experiment. Due to aging, the shape of the trajectory of the spiral tip changes from four-outer petals to three-outer petals and finally the spiral tip rotates rigidly. Using this recipie in the 3D case a scroll wave with a straight vertical filament is initiated. In the course of time the scroll wave exhibits a uniform twist rate all along its filament. This twist rate increases and eventually the filament changes to a helical form.