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Electric-permittivity-based instability of two dielectric miscible liquids under DC field

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Abstract

This paper considers the mixing of two dielectric miscible viscous liquids with different electric permittivities bounded by solid walls in an external electric field normal to the interface of the liquids. The mutual diffusion of these two liquids leads to the formation of an unsteady self-similar 1D diffusion layer. This layer is found to be unstable to the perturbations of the interface. A special sophisticated mathematical approach in self-similar variables is developed to estimate its stability. The results of a linear stability theory are verified by direct numerical simulations of the full nonlinear problem. A mixing efficiency based on the separation amplitude and an optimal electric field strength to achieve the fastest mixing are proposed in the present study.

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Acknowledgements

The investigation of the self-similar solution and its linear stability analysis were supported by the Russian Science Foundation, project N 20-79-00044, and the direct numerical simulation was supported by “Projets de Recherche Conjoints” (PRCCNRS). The research is carried out using the equipment of the shared research facilities of HPC computing resources at Lomonosov Moscow State University.

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Correspondence to S. Amiroudine.

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Amiroudine, S., Demekhin, E.A., Shelistov, V.S. et al. Electric-permittivity-based instability of two dielectric miscible liquids under DC field. Eur. Phys. J. E 45, 1 (2022). https://doi.org/10.1140/epje/s10189-021-00157-z

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  • DOI: https://doi.org/10.1140/epje/s10189-021-00157-z

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