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Simulation of stationary chemical patterns and waves in ionic reactions
In numerical simulations based on a general model chemical patterns
in ionic reaction-advection systems assuming a "self-consistent" electric
field are presented. Chemical waves as well as stationary concentration patterns
arise due to an interplay of an autocatalytic chemical reaction with diffusion,
migration of ions in an applied electric field and hydrodynamic flow.
Concentration gradients inside the chemical pattern lead to electric diffusion-potentials
which in turn affect the patterns. Thus,the model equations take
the general form of the Fokker-Planck equation. The principles of modeling a
ionic reaction-diffusion-migration system are applied to a real chemical system,
the nonlinear methylene blue-sulfide-oxygen reaction.