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Percolation Model of Fluid Flow in Heterogeneous Media

  • V. I. Selyakov
  • V. V. Kadet
Part of the Theory and Applications of Transport in Porous Media book series (TATP, volume 9)

Abstract

Numerous cases of violation of the linear Darcy’s law, which claims that the value of flux (flow rate) is directly proportional to the pressure gradient, has been ob­served. For very small flow velocities (pressure gradients) these deviations are caused by the formation of bounded fluid layers on the pore (capilliary) sur­faces [50, 51]. For relatively large velocities, deviations are caused by turbulence in the flow in pores (capillaries) and by the fluid kinetic energy losses on hetero­geneities like capillary junctions, etc. [51, 52]. For sufficiently homogeneous media, it is possible to average the law describing flow at the micro level over the whole volume of the medium to extend it to the macro level [47]. However for some heterogeneous media, such an operation is not valid [52]. Indeed, if r 1 and r 2, the radii of two successive capillaries, differ by an order of magnitude, then the local pressure gradients in them (for example, in the case of Poiseuille flow through the capillaries) are to one another as (r 1/r 2)4, i.e., differ by a factor of 104. In such a medium, all types of flow can take place at the micro level, namely the flow with the larger part of the pore space filled with bounded fluid; Poiseuille flow; transient flow from laminar to turbulent; and turbulent flow.

Keywords

Pressure Gradient Heterogeneous Medium Poiseuille Flow Transient Flow Percolation Model 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 1996

Authors and Affiliations

  • V. I. Selyakov
    • 1
  • V. V. Kadet
    • 2
  1. 1.Laboratory of Heterogeneous Media, Department of Theoretical ProblemsRussian Academy of ScienceMoscowRussia
  2. 2.Department of Oil & Gas HydromechanicsState Gubkin Oil & Gas AcademyMoscowRussia

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