Hyperbolic versus parabolic equation with fractional derivative to describe subdiffusion in a membrane system

Details Hyperbolic versus parabolic equation with fractional derivative to describe subdiffusion in a membrane system Hyperbolic versus parabolic equation with fractional derivative to describe subdiffusion in a membrane system

2008-06-13

arxiv.org/abs/0806.2294v1

Physics

Condensed Matter

Statistical Mechanics

16 pages, 7 figures

Scientific paper

We use the parabolic and hyperbolic equation with fractional time derivative to describe the subdiffusion in a system with thin membrane. We find the Green's function and solutions of the equation for the system where the homogeneous solution is separated by a thin membrane from the pure solvent. The solutions were obtained for two boundary conditions where the ratio of the concentrations at the membrane surfaces does not change in time and where the flux flowing through the membrane is proportional to the concentration difference between membrane surfaces. We discuss the difference between the solutions for parabolic and hyperbolic subdiffusion equations obtained for both boundary conditions.

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