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Image for: What sponges, beards and the lung have in common


Computational analysis of the path of two particles traveling through a porous media. Two different alignments with the gravitational field are depicted. The model system should be homogenous and should have similar properties in all directions (Isotropy). The opposite (Anisotropy) is observed. Anisotropy is used to describe the variations of properties depending on the directions.  As shown here the model system is too small. Therefore, the particles travel on different paths. The model system has to be at least 100 times larger than the characteristic grain size.
Computational analysis of the path of two particles traveling through a porous media. Two different alignments with the gravitational field are depicted. The model system should be homogenous and should have similar properties in all directions (Isotropy). The opposite (Anisotropy) is observed. Anisotropy is used to describe the variations of properties depending on the directions. As shown here the model system is too small. Therefore, the particles travel on different paths. The model system has to be at least 100 times larger than the characteristic grain size.

Source: Max Planck Institute for Marine Microbiology

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