Pattern of reaction diffusion fronts in laminar flows |
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Authors: | Leconte M Martin J Rakotomalala N Salin D |
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Institution: | Laboratoire Fluides Automatique et Systèmes Thermiques, Universités Pierre et Marie Curie and Paris Sud, C.N.R.S. (UMR 7608) Batiment 502, Campus Universitaire, 91405 Orsay Cedex, France. |
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Abstract: | Autocatalytic reaction between reacted and unreacted species may propagate as solitary waves, namely, at a constant front velocity and with a stationary concentration profile, resulting from a balance between molecular diffusion and chemical reaction. The effect of advective flow on the autocatalytic reaction between iodate and arsenous acid in cylindrical tubes and Hele-Shaw cells is analyzed experimentally and numerically using lattice Bhatnagar-Gross-Krook simulations. We do observe the existence of solitary waves with concentration profiles exhibiting a cusp and we delineate the eikonal and mixing regimes recently predicted. |
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