Abstract
We report our experimental study on chemical patterns in a spatial open reactor using the Belousov–Zhabotinsky reaction. A phase diagram showing different regimes of spiral dynamics is presented. The focus of the study is on transitions leading to defect-mediated turbulence (spiral turbulence). Some new interesting phenomena are described, including a transition from one type of spiral turbulence to another type, and the re-entry from spiral turbulence into ordered spiral waves. We also try to characterize different states of turbulence using the hierarchical structure theory.
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