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Transport in Porous Media

, Volume 127, Issue 3, pp 549–558 | Cite as

The Onset of Convection in an Anisotropic Heterogeneous Porous Medium: A New Hydrodynamic Boundary Condition

  • D. A. Nield
  • A. V. KuznetsovEmail author
Article
  • 91 Downloads

Abstract

The Horton–Rogers–Lapwood problem with strong heterogeneity and anisotropy is examined for a simple case, namely where the heterogeneity is provided by two layers, each of which is homogeneous and isotropic in a horizontal plane. We derived a new hydrodynamic boundary condition at the interface between two different porous media and then formulated and numerically solved the eigenvalue problem to determine the critical values of the wavenumber and Rayleigh number. We found that our approach works and gives the correct result for the homogeneous situation independent of the position of the interface. We also showed that for weak heterogeneity, by using modified anisotropy parameters weighted with the two layer depths, results obtained in Kvernvold and Tyvand (J Fluid Mech 90:609–624, 1979) for a single-layer problem can be used to approximate the critical Rayleigh number for the double-layer problem. We found that the agreement with the two-layer solution is best if a harmonic mean is used to define the mean permeability ratio and an arithmetic mean is utilized to define the mean conductivity ratio.

Keywords

Porous/porous interface Hydrodynamic boundary condition Natural convection Heterogeneity Anisotropy 

Notes

Acknowledgement

The authors are indebted to the Associate Editor and the anonymous reviewers for their constructive comments. AVK acknowledges with gratitude the support of the National Science Foundation (Award CBET-1642262) and the Alexander von Humboldt Foundation through the Humboldt Research Award.

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Department of Engineering ScienceUniversity of AucklandAucklandNew Zealand
  2. 2.Department of Mechanical and Aerospace EngineeringNorth Carolina State UniversityRaleighUSA

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