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Obrazová analýza řezů pórovitého materiálu
Hejtmánek, Vladimír ; Čapek, P.
Two methods of image analysis of cross-sections through two-phase porous media are compared. Linear filtering uses the recursive (IIR) Gaussian filter with the same vertical and horizontal blur radii. The images are also treated by removing small clusters of pixels in the void and solid phases. After linear filtering and before removing small clusters, the grey-level threshold is determined in order to partition all grey pixels into pore and solid pixels. Linear filtering reduces the specific surface very efficiently creating ``smooth'' pore walls and leaves small clusters of pixels in the images. Removing preserves ``rough'' pore walls and removes simultaneously small clusters from both the phases.
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Vztah mezi kapilárním tlakem a permeabilitou studovaný pomocí modelu trojrozměrné sítě pórů
Čapek, P. ; Hejtmánek, Vladimír
The results of this study clearly indicate that, in the network representation of a porous medium, the cross-sectional shape of throuds, the chamber-to throut aspect ratio, and spatial correlations between chambers and adjacent throats have the significant unfluence on permeability and mercury-air displacement. Since the critical capillary pressure is solely determined by the throat size and shape in this study, the chamber-to throat aspect ratio is the only pore structure parameter, which does not have any influence on the capillary pressure curves at all
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