期刊
PURE AND APPLIED CHEMISTRY
卷 77, 期 8, 页码 1395-1408出版社
WALTER DE GRUYTER GMBH
DOI: 10.1351/pac200577081395
关键词
Spiral instabilities; Belousov-Zhabotinsky reaction; long-wavelength instability; Doppler instability; reaction-diffusion
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.
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