An experimental investigation of the brinkman layer thickness at a fluid-porous interface

Afshin Goharzadeh, Arash Saidi, Dianchang Wang, Wolfgang Merzkirch, Arzhang Khalili

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

15 Scopus citations

Abstract

In the present study, we characterized the flow in the vicinity of a permeable interface using particle image velocimetry (PIV) and refractive index matching (RIM). The porous layer is exposed to a laminar flow in the overlying fluid layer, and the velocity field in the interfacial region is measured. The averaged velocities of fluid particles decrease continuously when moving from the fluid layer into the porous one. We measure the thickness of the transition layer, also known as Brinkman layer, defined as the depth below the porous interface within which the velocity decreases to a constant value. It was observed that the thickness of Brinkman layer is of order of the grain diameter, and hence, much larger than the square root of permeability predicted by previous theoretical studies. A new theoretical approach based on depth-dependent permeability and effective viscosity is performed, that agreed well with experimental results.

Original languageBritish English
Title of host publicationIUTAM Symposium on One Hundred Years of Boundary Layer Research
Subtitle of host publicationProceedings of the IUTAM Symposium Held at DLR-Gottingen, Germany, August 12-14, 2004
PublisherSpringer Verlag
Pages445-454
Number of pages10
ISBN (Print)9781402041495
DOIs
StatePublished - 2006

Publication series

NameSolid Mechanics and its Applications
Volume129
ISSN (Print)0925-0042

Keywords

  • Brinkman layer
  • Fluid-porous laye
  • Permeable interface

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