CrossRef enabled

PAC Archives

Archive →

Pure Appl. Chem., 2005, Vol. 77, No. 8, pp. 1395-1408

Control of spiral instabilities in reaction-diffusion systems

Hui-Min Liao1, Min-Xi Jiang1, Xiao-Nan Wang1, Lu-Qun Zhou1 and Qi Ouyang1,2

1 Department of Physics
2 Center for Theoretical Biology, Peking University, Beijing 100871, P.R. China

Abstract: Spiral instabilities and their controls are investigated in a reaction-diffusion system using the Belousov-Zhabotinsky reaction. Two spiral instabilities, the long-wavelength instability and the Doppler instability, are reported, which can lead to spatiotemporal chaos. The long-wavelength instability occurs in an oscillatory regime, while the Doppler instability occurs in an excitable regime. To control these two instabilities, two different strategies are proposed according to their defect-generating mechanisms. For the long-wavelength instability in an oscillatory system, the control can be achieved by introducing a local pacemaker, which emits stable traveling waves to sweep off the unstable spiral defects. For the Doppler instability, the control can be achieved by trapping the spiral tip with a local area of higher diffusion coefficient than its surroundings.