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arXiv 2011.15057math.AP
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Nernst-Planck-Navier-Stokes系统的内电中性

Interior Electroneutrality in Nernst-Planck-Navier-Stokes Systems

Peter Constantin, Mihaela Ignatova, Fizay-Noah Lee

摘要:

本文研究了能斯特-普朗克-纳维尔-斯托克斯方程描述的流体中离子扩散的德拜长度消失极限。在渐近稳定的情况下,阻塞(消失的正常通量)和统一的选择性(特殊Dirichlet)的离子浓度的边界条件,我们证明了离子电荷密度$ρ$收敛到零的内部的域,在极限的消失德拜长度($ε\to 0$)。对于不稳定的制度的Dirichlet边界条件的离子浓度,我们证明了在时间和$ε$是统一的边界。我们还考虑电中性的边界条件,我们证明,电中性$ρ\to 0$实现在任何固定的$ε> 0$,在$L^p$的时间呈指数快速,所有$1\le p<\infty$。结果保持两个相反的电荷的离子物种与任意离子扩散系数,在有界域与光滑的边界。

英文摘要:

We consider the limit of vanishing Debye length for ionic diffusion in fluids, described by the Nernst-Planck-Navier-Stokes system. In the asymptotically stable cases of blocking (vanishing normal flux) and uniform selective (special Dirichlet) boundary conditions for the ionic concentrations, we prove that the ionic charge density $ρ$ converges in time to zero in the interior of the domain, in the limit of vanishing Debye length ($ε\to 0$). For the unstable regime of Dirichlet boundary conditions for the ionic concentrations, we prove bounds that are uniform in time and $ε$. We also consider electroneutral boundary conditions, for which we prove that electroneutrality $ρ\to 0$ is achieved at any fixed $ε> 0$, exponentially fast in time in $L^p$, for all $1\le p<\infty$. The results hold for two oppositely charged ionic species with arbitrary ionic diffusivities, in bounded domains with smooth boundaries.

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