Fluctuation-dominated kinetics under stirring
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 reac...
| Authors: | , , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 1997 |
| Country: | España |
| Institution: | Universidad de Barcelona |
| Repository: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/12788 |
| Online Access: | https://hdl.handle.net/2445/12788 |
| Access Level: | Open access |
| Keyword: | Química física Física estadística Thermodinàmica Dinàmica de fluids Chemistry, Physical and theoretical Statistical physics Fluid dynamics Thermodynamics |
| Summary: | 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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