Dresden 2020 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 55: Poster: Turbulence; Complex Fluids; Microfluidics; Droplets and Wetting
DY 55.11: Poster
Donnerstag, 19. März 2020, 15:00–18:00, P1A
Effect of disorder on dispersive transport in porous media — •Felix Jonathan Meigel1,4, Thomas Darwent3, Lucas Goehring3, and Karen Alim1,2 — 1Max Planck Institute for Dynamics and Self-Organization, Goettingen, Germany — 2Physics Department, Technical University Munich, Germany — 3School of Science and Technology, Nottingham Trent University, Nottingham, United Kingdom — 4Max Planck Institute for the Physics of Complex Systems, Dresden, Germany
Transport by the means of fluid flow through porous media is central for many processes in our daily life. Porous media show a large variety of morphologies that may change over time. How does the morphology interplay with the transport of solute particles through the medium? Here, we show how changing the disorder in a medium affects transport through the porous medium. We connect the dynamics on the level of single pores with the macroscopic transport through the whole medium. Using a first passage time formalism, we describe how macroscopic transport statistics emerge from the interplay of individual pores. We find dynamics that deviate from Fickian descriptions and cannot be explained using an effective advection diffusion equation. Using a two-dimensional model porous medium in which we can control the disorder, we focus on the variance of the dispersive front of a medium being filled up to saturation with solute particles. We find that the variance changes non-monotonically as either the disorder or the Peclet number is altered. We find these results both in simulation and experiments and give a theoretical explanation of our findings.