Spiral instability to line sources in forced chemical pattern turbulence
Institut Non Linéaire de Nice, UMR 129 CNRS-UNSA,
1361 route des Lucioles, 06560 Valbonne, France
Accepted: 12 August 1996
A stably rotating spiral wave in the Belousov-Zhabotinsky reaction studied in an open spatial reactor becomes unstable when forced by a periodic chemical oscillation. The instability starts from the spiral center and occurs when the ratio of the spiral-rotation period to that of the forcing is close to 3/2. The resulting disordered state involves drifting line sources that emit waves in both directions. These unusual objects are reminiscent of the travelling hole solutions to the one-dimensional complex Ginzburg-Landau equation.
PACS: 05.70.Ln – Nonequilibrium thermodynamics, irreversible processes / 82.40.Ck – Pattern formation in vortices-diffusion systems / 47.54.+r – Pattern selection
© EDP Sciences, 1996