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Microscale Investigations of Highfrequency Wave Propagation Through Highly Porous Media
Author(s) -
Uribe David,
Saenger Erik,
Jänicke Ralf,
Steeb Holger,
Ruiz Oscar
Publication year - 2012
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201210266
Subject(s) - tortuosity , microscale chemistry , porous medium , porosity , scanner , mechanics , acoustics , materials science , wave propagation , work (physics) , finite difference method , optics , physics , mathematical analysis , mathematics , composite material , thermodynamics , mathematics education
Wave propagation in highly porous materials has a well established theoretical background. Still there are parameters which require complex laboratory experimentation in order to find numerical values. This paper presents an effective method to calculate the tortuosity of aluminum foam using numerical simulations. The work flow begins with the acquisition of the foam geometry by means of a micro‐CT scanner and further image segmentation and analysis. The elastodynamic wave propagation equation is solved using a velocity‐stress rotated staggered finite‐difference technique. The effective wave velocities are calculated and using the fluid and, aluminum effective properties, the tortuosity is determined. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)