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arXiv 1506.08211math.APmath-phmath.MP
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一维Poisson-Nernst-Planck系统边界层解稳定性的指数衰减估计

Exponential decay estimates for the stability of boundary layer solutions to Poisson-Nernst-Planck systems: one spatial dimension case

Chia-Yu Hsieh, Tai-Chia Lin

摘要:

在小参数$ε$的情况下,一维有限空间区域上的Poisson-Nernst-Planck(PNP)系统具有稳态解,称为一维边界层解,其轮廓在边界点附近形成边界层,并且当$ε$趋近于零时,在内部区域变为at。对于(含时)PNP系统的一维边界层解的稳定性,我们估计了具有整体电中性的扰动问题的解。我们证明了扰动问题的解的$H^{-1}_x$范数随时间指数衰减,且指数与$ε$无关,如果静电势的Robin边界条件的系数有一个合适的正下界。主要的困难在于当$ε$趋于零时,一维边界层解在边界点处的梯度可能会爆炸。我们论证的主要思想是将扰动问题转化为另一个抛物系统,并给出一个新的有用的能量定律来证明指数衰减估计。

英文摘要:

With a small parameter $ε$, Poisson-Nernst-Planck (PNP) systems over a finite one-dimensional (1D) spatial domain have steady state solutions, called 1D boundary layer solutions, which profiles form boundary layers near boundary points and become at in the interior domain as $ε$ approaches zero. For the stability of 1D boundary layer solutions to (time-dependent) PNP systems, we estimate the solution of the perturbed problem with global electroneutrality. We prove that the $H^{-1}_x$ norm of the solution of the perturbed problem decays exponentially (in time) with exponent independent of $ε$ if the coefficient of the Robin boundary condition of electrostatic potential has a suitable positive lower bound. The main difficulty is that the gradients of 1D boundary layer solutions at boundary points may blow up as $ε$ tends to zero. The main idea of our argument is to transform the perturbed problem into another parabolic system with a new and useful energy law for the proof of the exponential decay estimate.

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