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Fluctuation-dominated kinetics under stirring

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We investigate the effects of stirring on the kinetics of the A + B → 0 reaction under stoichiometrical conditions in 2D. We consider both a steady eddy-lattice flow and a random flow mimicking turbulence. In both situations complex decay patterns are detected. Only an intermediate stage of the reaction is dominated by mixing. The long-time behavior shows fluctuation-dominated kinetics, c ( t ) ∝ t − 1 / 2 , governed by effective diffusion. For the case of an eddy-lattice flow a very slow intermediate regime emerges, c ( t ) ∝ t − 1 / 4 , which is associated with the closed topology of flow lines.

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REIGADA SANZ, Ramon, SAGUÉS I MESTRE, Francesc, SOKOLOV, Igor m., SANCHO, José m., BLUMEN, Alexander. Fluctuation-dominated kinetics under stirring. _Physical Review Letters_. 1997. Vol. 78, núm. 4, pàgs. 741-744. [consulta: 23 de gener de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/12788]

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