Time evolution of the reaction front in a subdiffusive system
Tadeusz Kosztołowicz, Katarzyna D. Lewandowska
Abstract
Using the quasistatic approximation, we show that in a subdiffusion--reaction system the reaction front xf evolves in time according to the formula xf tα/2, with α 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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