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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 45: Modeling and Simulation of Soft Matter IV
CPP 45.5: Talk
Thursday, March 21, 2024, 16:00–16:15, H 0111
Impact of local structure variations on air flow through porous sheets — •Karin Zojer1, Ekaterina Baikova1, Matthias Neumann2, Phillip Gräfensteiner2, Peter Leitl3, Andoni Rodriguez3, Andre Hilger4, Ingo Manke4, Ulrich Hirn1, and Volker Schmidt2 — 1Graz University of Technology, Graz, Austria — 2Ulm University, Ulm, Germany — 3bionic surface technologies, Austria — 4Institute of Materials, Helmholtz Zentrum Berlin, Berlin, Germany
Predicting the rapid transport of gases through inhomogeneous porous layers is difficult because the flow tends to be dominated by a few effective paths, which differ from the most frequently occurring paths of the structure. By looking at the microstructure, is it possible to predict these most effective transport pathways, assuming that all local variations are known? What combination of local structural properties properties favors these pathways? We combine computational fluid dynamics and pore network pore network simulations with a copula-based property-pair dependence analysis to address these questions for air transport through two model materials. These materials are paper sheets, before and after uniaxial compression, whose microstructural variations are fully known from µ-CT 3D imaging. Compression converts large variations in sheet thickness into large variations in density and is therefore expected to localize the air flow and alter the relevant pathways.
Keywords: porous materials; computational fluid dynamics; pore network models; statistical morphology analysis; microstructure