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Expanding scroll rings in a model for the photosensitive Belousov-Zhabotinsky reaction

While free scroll rings are non-stationary objects that either grow or contract with time, spatial confinement can have a large impact on their evolution reaching from significant lifetime extension [J. F. Totz , H. Engel, and O. Steinbock, New J. Phys. 17, 093043 (2015)] up to formation of stable s...

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Published in:arXiv.org 2016-01
Main Authors: Azhand, Arash, Buchholz, Rico, Totz, Jan F, Engel, H
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Buchholz, Rico
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description While free scroll rings are non-stationary objects that either grow or contract with time, spatial confinement can have a large impact on their evolution reaching from significant lifetime extension [J. F. Totz , H. Engel, and O. Steinbock, New J. Phys. 17, 093043 (2015)] up to formation of stable stationary and breathing pacemakers [A. Azhand, J. F. Totz, and H. Engel, Europhys. Lett. 108, 10004 (2014)]. Here, we explore the parameter range in which the interaction between an axis-symmetric scroll ring and a confining planar no-flux boundary can be studied experimentally in transparent gel layers supporting chemical wave propagation in the photosensitive variant of the Belousov-Zhabotinsky medium. Based on full three-dimensional simulations of the underlying modified complete Oregonator model for experimentally realistic parameters, we determine the conditions for successful initiation of scroll rings in a phase diagram spanned by the layer thickness and the applied light intensity. Furthermore, we discuss whether the illumination-induced excitability gradient due to Lambert-Beer's law as well as a possible inclination of the filament plane with respect to the no-flux boundary can destabilize the scroll ring.
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subjects Computer simulation
Confining
Inclination
Light
Luminous intensity
Mathematical models
Organic chemistry
Pacemakers
Parameter modification
Phase diagrams
Photosensitivity
Rings (mathematics)
Surgical implants
Thickness
Three dimensional models
Wave propagation
title Expanding scroll rings in a model for the photosensitive Belousov-Zhabotinsky reaction
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