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BP: Fachverband Biologische Physik
BP 16: Poster IV
BP 16.6: Poster
Dienstag, 17. März 2020, 14:00–16:00, P2/EG
Absorption Induced Geometry Change in Porous Media — •Carl Becker1 and Karen Alim1,2 — 1Max Planck Institute for Dynamics and Self-Organization — 2Technical University of Munich
Solute transport through natural porous media is often strongly incoherent throughout the medium due to random pore-sizes and connections. This can be improved either by creating artificial porous media layer by layer or by actively changing the network geometry in a random porous medium. One method to change the geometry in a random porous medium with little effort is by flushing a solute through the medium which is absorbed at the pore-walls and thereby changes the pore-size (e.g.~an acid etching away the pore-walls). It would be highly time- and energy-efficient if this method could be used to optimise the transport properties of porous media. Recently, it has been shown that porous media with low porosity can be approximated by tubular networks with varying radii. Here, we use this approximation to analytically investigate the solute dynamics in single pores with absorbing walls. This is used to predict the impact of small solute concentration peaks travelling through the network which get absorbed at the walls and change the pore-sizes. We show a first numerical example where absorption induced geometry change is used to improve the transport properties of a toy-model of a porous medium.