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Transport in porous media
A porous medium is defined as a solid matrix filled by a fluid (steady or in motion). At a microscopic level a porous medium is a network of intricate connecting ducts. However, at a macroscopic level it may be treated as a continuum medium showing apparent mixing and dragging effects. This last approach is more convenient when transport analysis has to be made in a porous medium, as far as its apparent properties are known.