Thursday, October 25, 2012

1210.6391 (Markus Schmuck et al.)

Derivation of effective macroscopic Stokes-Cahn-Hilliard equations for
periodic immiscible flows in porous media

Markus Schmuck, Gregorios A. Pavliotis, Serafim Kalliadasis
Using thermodynamic and variational principles we examine a basic phase field model for a mixture of two incompressible fluids in strongly perforated domains. With the help of the multiple scale method with drift and our recently introduced splitting strategy for Ginzburg-Landau/Cahn-Hilliard type equations [1], we rigorously derive an effective macroscopic phase field formulation under the assumption of periodic flow and a sufficiently large Peclet number. As for classical convection-diffusion problems, we obtain systematically diffusion-dispersion relations (including Taylor-Aris-dispersion). Our results also provide a convenient computational framework to macroscopically track interfaces in porous media. In view of the well-known versatility of phase field models, our study proposes a promising model for many engineering and scientific applications such as multiphase flows in porous media, microfluidics, and fuel cells.
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