Article,

Distribution in flowing reaction-diffusion systems

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PHYSICAL REVIEW E, (2009)
DOI: 10.1103/PhysRevE.80.061132

Abstract

A power-law distribution is found in the density profile of reacting systems A+B -> C+D and 2A -> 2C under a flow in two and three dimensions. Different densities of reactants A and B are fixed at both ends. For the reaction A+B, the concentration of reactants asymptotically decay in space as x(-1/2) and x(-3/4) in two dimensions and three dimensions, respectively. For 2A, it decays as log(x)/x in two dimensions. The decay of A+B is explained considering the effect of segregation of reactants in the isotropic case. The decay for 2A is explained by the marginal behavior of two-dimensional diffusion. A logarithmic divergence of the diffusion constant with system size is found in two dimensions.

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