Fluid Dynamics

, Volume 40, Issue 4, pp 585–592 | Cite as

On Determining the Percolation Reynolds Number and the Characteristic Linear Dimension for Ideal and Fictitious Porous Media

  • M. N. Dmitriev
  • N. M. Dmitriev


Various versions of representations of the percolation Reynolds number for porous media with isotropic and anisotropic flow properties are considered. The formulas are derived and the variants are analyzed with reference to model porous media with a periodic microstructure formed by systems of capillaries and packings consisting of spheres of constant diameter (ideal and fictitious porous media, respectively). A generalization of the Kozeny formula is given for determining the capillary diameter in an ideal porous medium equivalent to a fictitious medium with respect to permeability and porosity and it is shown that the capillary diameter is nonuniquely determined. Relations for recalculating values of the Reynolds number determined by means of formulas proposed earlier are given and it is shown that taking the microstructure of porous media into account, as proposed in [1, 2], makes it possible to explain the large scatter of the numerical values of the Reynolds number in processing the experimental data.


Reynolds number characteristic linear dimension ideal porous medium fictitious soil porosity surface porosity permeability 


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© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • M. N. Dmitriev
  • N. M. Dmitriev

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