TY - JOUR
T1 - Transition from spiral waves to defect-mediated turbulence induced by gradient effects in a reaction-diffusion system
AU - Zhang, Chunxia
AU - Zhang, Hong
AU - Ouyang, Qi
AU - Hu, Bambi
AU - Gunaratne, Gemunu H.
N1 - This work was supported in part by grants from the Chinese Natural Science Foundation (C.Z. and Q.O.), the Hong Kong Research Grants Council and the Hong Kong Baptist University Faculty Research Grant (H.Z. and B.H.), and the National Science Foundation and the office of Naval Research (G.G.)
PY - 2003/9/3
Y1 - 2003/9/3
N2 - The transition from spiral waves to defect-mediated turbulence was studied in a spatial open reactor using Belousov-Zhabotinsky reaction. The experimental results show a new mechanism of the transition from spirals to spatiotemporal chaos, in which the gradient effects in the three-dimensional system are essential. The transition scenario consists of two stages: first, the effects of gradients in the third dimension cause a splitting of the spiral tip and a deletion of certain wave segments, generating new wave sources; second, the waves sent by the new wave sources undergo a backfire instability, and the back waves are laterally unstable. As a result, defects are automatically generated and fill all over the system. The result of numerical simulation using the FitzHugh-Nagumo model essentially agrees with the experimental observation.
AB - The transition from spiral waves to defect-mediated turbulence was studied in a spatial open reactor using Belousov-Zhabotinsky reaction. The experimental results show a new mechanism of the transition from spirals to spatiotemporal chaos, in which the gradient effects in the three-dimensional system are essential. The transition scenario consists of two stages: first, the effects of gradients in the third dimension cause a splitting of the spiral tip and a deletion of certain wave segments, generating new wave sources; second, the waves sent by the new wave sources undergo a backfire instability, and the back waves are laterally unstable. As a result, defects are automatically generated and fill all over the system. The result of numerical simulation using the FitzHugh-Nagumo model essentially agrees with the experimental observation.
UR - http://www.scopus.com/inward/record.url?scp=85035271466&partnerID=8YFLogxK
U2 - 10.1103/PhysRevE.68.036202
DO - 10.1103/PhysRevE.68.036202
M3 - Journal article
AN - SCOPUS:85035271466
SN - 2470-0045
VL - 68
JO - Physical Review E
JF - Physical Review E
IS - 3
M1 - 036202
ER -