Electroconvective instability of self-similar equilibria

Details Electroconvective instability of self-similar equilibria Electroconvective instability of self-similar equilibria

2010-01-25

arxiv.org/abs/1001.4502v2

Physics

Fluid Dynamics

49 pages, 27 figures

Scientific paper

Stability of electro-hydrodynamic processes between ion-exchange membranes is investigated. Solutions of the equilibrium problem are commonly described in the one-dimensional (1D) steady-state approximation. In the present work, a novel class of 1D unsteady self-similar equilibrium solutions is developed, whose existence is supported by recent experiments. 1D unsteady two-parametric family of self-similar equilibrium solutions and their stability are studied both asymptotically in small dimensionless Debye length, and numerically. The self-similar solutions and marginal stability curves obtained in both approaches are in a fair agreement with each other at intermediately large times for which the dimensionless distance between membranes is large.

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