Effect of packing height and location of porous media on heat transfer in a cubical cavity: Are extended Darcy simulations sufficient?

Manu Chakkingal, Sabino Schiavo, Iman Ataei-Dadavi, Mark J. Tummers, Chris R. Kleijn, Saša Kenjereš

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
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Abstract

We numerically investigate natural convection in a bottom-heated top-cooled cavity, fully and partially filled with adiabatic spheres (with diameter-to-cavity-size ratio d/L=0.2) arranged in a Simple Cubic Packing (SCP) configuration. We study the influence of packing height and location of porous media. We carry out the simulations using water as the working fluid with Prandtl number, Pr=5.4 at Rayleigh number Ra=1.16×105, 1.16 × 106 and 2.31 × 107. The applicability and suitability of Darcy-Forchheimer assumption to predict the global heat transfer is analysed by comparing it with the pore-structure resolved simulations. We found that the heat transfer in pore-structure resolved simulations is comparable to that in fluid-only cavities at high Rayleigh numbers, irrespective of the number of layers of packing and its location. Discrepancies in heat transfer between the Darcy-Forchheimer and the fully resolved simulations are observed when the porous medium is close to the isothermal wall and at high Ra, while it vanishes when the porous medium is away from the isothermal bottom wall.

Original languageEnglish
Article number108617
Number of pages12
JournalInternational Journal of Heat and Fluid Flow
Volume84
DOIs
Publication statusPublished - 2020

Keywords

  • ANSYS-FLUENT
  • Darcy-Forchheimer assumption
  • Natural convection
  • OpenFOAM
  • Partially filled
  • Polyhedral mesh
  • Pore-structure resolved
  • Porous media
  • Shifted porous layer

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