On the use of autocorrelation functions, permeability tensors, and computed tomography to characterise the anisotropy of diesel particulate filter materials
BRUNO, Giovanni
BAM Bundesanstalt für Materialforschung u. -prüfung
University of Potsdam = Universität Potsdam
< Reduce
BAM Bundesanstalt für Materialforschung u. -prüfung
University of Potsdam = Universität Potsdam
Language
en
Article de revue
This item was published in
Philosophical Magazine. 2020, vol. 100, n° 22, p. 2802-2835
Taylor & Francis
English Abstract
We show how the combination of the spatial autocorrelation function and permeability calculations, applied to 3D X-ray computed tomography data, can yield quantitative information on the anisotropy of both meso-structure ...Read more >
We show how the combination of the spatial autocorrelation function and permeability calculations, applied to 3D X-ray computed tomography data, can yield quantitative information on the anisotropy of both meso-structure and fluid flow in Diesel Particulate Filter (DPF) materials, such as Cordierite and SiC. It was found that both the degree of anisotropy, and the orientation of the permeability and meso-structure are similar, but not identical. We confirm that the morphological anisotropy of cordierite materials is weak, and clearly influenced by the extrusion process that determines the main direction of anisotropy. Properties of the autocorrelation function are discussed and it is shown why estimating the characteristic length of real meso-structures (grain or ‘pore’ size) is not possible. Finally, we show that the autocorrelation function applied on grey-level images can give a good estimate of the degree of anisotropy even with limited resolution.Read less <
English Keywords
Anisotropy
Autocorrelation function
Computed tomography
Permeability tensor
Diesel particulates filter
Ceramics
Origin
Hal imported