Regensburg 2025 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: Modeling and Simulation of Soft Matter III
CPP 28.3: Vortrag
Mittwoch, 19. März 2025, 15:30–15:45, H34
Highways in pore networks — •Werner Napetschnig1, Ekaterina Baikova1,2, Maximilian Fuchs1,2, and Karin Zojer1,2 — 1Institute for Solid State Physics, Graz University of Technology, Austria — 2Christian Doppler Laboratory for Mass Transport through Paper
When simulating Stokes flow of gases through porous media, the volume flow is often explained by microstructural properties. However, most of these properties do not adequately account for the arrangement of pathways, which is strongly material dependent. Here, we highlight the importance of considering these pathways and explore different techniques to identify flow paths. A pore network model based on micro-computed tomography scans of paper samples serves as the basis for air flow simulation. Two methods are evaluated to identify transport pathways and locate the most critical flow regions. In the first method, the maximum flow rate between individual pores determines the paths. It is shown that the highest flow rate travels between fiber network layers and clusters at a few exit pores. The second method identifies paths iteratively through a stochastic approach where the flow rate is the weighting factor. We identified the most frequently used highway regions. In addition, we studied the orientation and geometric properties of these highways. Our results show that only a few segments within the highways significantly influence the overall flow. Therefore, these highways need to be numerically represented when defining the explanatory microstructure properties.
Keywords: MCT; PNM; paper; pathways; Stokes flow