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Impact of cross and main diffusion coefficients on symmetry breaking in nonreactive diffusion systems
Berin Šeta1, Jon Spangenberg, Mounir M Bou-Ali2
1Technical University of Denmark, Department of Civil and Mechanical Engineering, Koppels Allé, Kgs. Lyngby 2800, Denmark.
Abstract:
Diffusion-triggered convection can occur in a gravitationally stable system of two superimposed mixtures. As instability develops, two distinct patterns may emerge: double-diffusive (DD) or diffusion-layer convection (DLC). Traditionally, nonsymmetric patterns above and below the interface were thought to require chemical reaction. We show that symmetry can be broken by composition-dependent diffusion, with or without cross diffusion. Furthermore, only the composition-dependent cross diffusion can lead to a range of coexisting patterns and provide new insights into staircase instability.
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