4.7 Article

Buoyancy-driven instabilities around miscible A plus B→C reaction fronts: A general classification

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PHYSICAL REVIEW E
卷 91, 期 2, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.91.023001

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  1. FRS-FNRS under the PDR-FORECAST project
  2. Prodex

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Upon contact between miscible solutions of reactants A and B along a horizontal interface in the gravity field, various buoyancy-driven instabilities can develop when an A + B -> C reaction takes place and the density varies with the concentrations of the various chemicals. To classify the possible convective instability scenarios, we analyze the spatial dependence of the large time asymptotic density profiles as a function of the key parameters of the problem, which are the ratios of diffusion coefficients and of solutal expansion coefficients of species A, B, and C. We find that 62 different density profiles can develop in the reactive problem, whereas only 6 of them can be obtained in the nonreactive one.

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