期刊
SIAM JOURNAL ON APPLIED MATHEMATICS
卷 65, 期 3, 页码 754-766出版社
SIAM PUBLICATIONS
DOI: 10.1137/S0036139903420931
关键词
singular perturbation; boundary layers; exchange lemma
Boundary value problems of a one-dimensional steady-state Poisson - Nernst - Planck (PNP) system for ion flow through a narrow membrane channel are studied. By assuming the ratio of the Debye length to a characteristic length to be small, the PNP system can be viewed as a singularly perturbed problem with multiple time scales and is analyzed using the newly developed geometric singular perturbation theory. Within the framework of dynamical systems, the global behavior is first studied in terms of limiting fast and slow systems. It is rather surprising that a complete set of integrals is discovered for the (nonlinear) limiting fast system. This allows a detailed description of the boundary layers for the problem. The slow system itself turns out to be a singularly perturbed one, too, which indicates that the singularly perturbed PNP system has three different time scales. A singular orbit ( zeroth order approximation) of the boundary value problem is identified based on the dynamics of limiting fast and slow systems. An application of the geometric singular perturbation theory gives rise to the existence and ( local) uniqueness of the boundary value problem.
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