Dynamics of scroll waves in a cylinder jacket geometry.

Area of Science:

• Chemical kinetics
• Nonlinear dynamics
• Physical chemistry

Background:

• Scroll waves are crucial in reaction-diffusion systems like the Belousov-Zhabotinsky reaction.
• Understanding scroll wave behavior in confined geometries is essential for predicting complex spatiotemporal patterns.

Purpose of the Study:

• To investigate the effect of cylinder jacket thickness on scroll wave dynamics.
• To characterize the transition from intramural to transmural scroll waves.
• To analyze filament rupture, reorientation, and shrinkage kinetics.

Main Methods:

• Experimental investigation using optical tomography.
• Utilizing a cylinder jacket-shaped reactor to control confinement.
• Observation and analysis of Belousov-Zhabotinsky reaction dynamics.

Main Results:

• Scroll wave stability is dependent on cylinder jacket thickness.
• Narrowing the jacket increases filament-wall interactions, leading to rupture and pinning.
• Filaments reorient from vertical to horizontal, transitioning to transmural waves.
• Kinetics of reorientation and shrinkage were quantified.
• No new filament generation was observed from wave collisions.

Conclusions:

• Cylinder jacket thickness significantly influences scroll wave fate and morphology.
• Filament rupture and reorientation are key mechanisms for wave pattern changes in confined systems.
• The study provides insights into reentry phenomena and filament dynamics in reaction-diffusion systems.