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Influence of Foam Morphology on Effective Properties Related to Metal Melt Filtration
Author(s) -
Werzner Eric,
Abendroth Martin,
Demuth Cornelius,
Settgast Christoph,
Trimis Dimosthenis,
Krause Hartmut,
Ray Subhashis
Publication year - 2017
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201700240
Subject(s) - tortuosity , materials science , porosity , metal foam , pressure drop , filtration (mathematics) , composite material , permeability (electromagnetism) , anisotropy , particle size , ceramic foam , porous medium , ceramic , mechanics , geology , statistics , physics , mathematics , quantum mechanics , membrane , biology , genetics , paleontology
In this article, a numerical study on the sensitivity, related to the performance of open‐cell foams used for the depth filtration of liquid metals, on two characteristic morphological properties is presented. Therefore, simulations of fluid flow and particle transport inside an artificial foam structure are carried out, whose porosity and strut shape is varied within a certain expected range. For comparison purposes, however, the simulations are also performed for three typical ceramic foam filters (CFF) with pore densities of 20 and 30 PPI, whose geometries are obtained from CT scans. In order to allow for a comparison between the different structures, a reference length is introduced that relies upon the actual ratio of pores per volume. The evaluation is mainly based on the comparison of the hydraulic tortuosity, the viscous and the inertial permeability coefficients as well as the initial filtration coefficient for alumina inclusions, with their size ranging from of 10 to 40 μm at process conditions typically encountered during the aluminum filtration. It is shown that the ratio of filtration coefficient and pressure drop increases with the porosity, while the material distribution between the struts and the joints is less influential. Finally, the article also provides information on the anisotropy of CFFs and on the transition behavior from steady to unsteady flow in open‐cell foams.