Time evolution of the reaction front in a subdiffusive system

Details Time evolution of the reaction front in a subdiffusive system Time evolution of the reaction front in a subdiffusive system

2006-03-06

arxiv.org/abs/cond-mat/0603139v2

Phys. Rev. E 78 (066103) 2008

Physics

Condensed Matter

Statistical Mechanics

18 pages, 3 figures

Scientific paper

10.1063/1.2759750

Using the quasistatic approximation, we show that in a subdiffusion--reaction system the reaction front $x_{f}$ evolves in time according to the formula $x_{f} \sim t^{\alpha/2}$, with $\alpha$ being the subdiffusion parameter. The result is derived for the system where the subdiffusion coefficients of reactants differ from each other. It includes the case of one static reactant. As an application of our results, we compare the time evolution of reaction front extracted from experimental data with the theoretical formula and we find that the transport process of organic acid particles in the tooth enamel is subdiffusive.

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