Effect of packing height and location of porous media on heat transfer in a cubical cavity

Are extended Darcy simulations sufficient?

Journal Article (2020)
Author(s)

Manu Chakkingal (TU Delft - ChemE/Transport Phenomena)

Sabino Schiavo (Student TU Delft)

Iman Dadavi (TU Delft - ChemE/Transport Phenomena)

M.J. Tummers (TU Delft - Fluid Mechanics)

Chris R. Kleijn (TU Delft - ChemE/Transport Phenomena)

S. Kenjeres (TU Delft - ChemE/Transport Phenomena)

Research Group
ChemE/Transport Phenomena
Copyright
© 2020 M. Chakkingal, Sabino Schiavo, I. Ataei Dadavi, M.J. Tummers, C.R. Kleijn, S. Kenjeres
DOI related publication
https://doi.org/10.1016/j.ijheatfluidflow.2020.108617
More Info
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Publication Year
2020
Language
English
Copyright
© 2020 M. Chakkingal, Sabino Schiavo, I. Ataei Dadavi, M.J. Tummers, C.R. Kleijn, S. Kenjeres
Research Group
ChemE/Transport Phenomena
Volume number
84
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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.