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LOCAL THERMAL NONEQUILIBRIUM EFFECTS ON NATURAL CONVECTION IN A POROUS CAVITY HEATED AND COOLED FROM THE SIDE IN A SPATIALLY SINUSOIDAL MANNER

Volumen 19, Ausgabe 2, 2016, pp. 113-129
DOI: 10.1615/JPorMedia.v19.i2.20
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ABSTRAKT

Steady non-Darcy natural convection in a rectangular cavity filled with a heat-generating porous medium is studied numerically by adopting the local thermal nonequilibrium (LTNE) model in this article. All of the walls of the enclosure are adiabatic except the left wall, which is partially heated and cooled with a sinusoidal temperature profile. The results show that, compared with the uniform boundary conditions, the sinusoidal boundary conditions enhance the heat transfer rate of porous cavity. Under the same boundary conditions, the LTNE and local thermal equilibrium models can lead to significant differences inflow patterns and temperature fields. When the periodicity parameter becomes large enough (N = 30), the uniform thermal boundary condition and sinusoidal thermal boundary condition have the same effects on heat transfer of the porous cavity. A high interphase heat transfer coefficient (H = 1000) can lead to faster reduction of the heat transfer of the porous cavity with the increase of periodicity parameter. A high thermal conductivity ratio (γ = 1) can slow down the reduction speed of convective heat transfer when the periodicity parameter (N) increases.

REFERENZIERT VON
  1. Nield Donald A., Bejan Adrian, Internal Natural Convection: Heating from the Side, in Convection in Porous Media, 2017. Crossref

  2. Wang Yazhou, Qin Guoliang, He Wenqiang, Bao Zhenzhong, Chebyshev spectral element method for natural convection in a porous cavity under local thermal non-equilibrium model, International Journal of Heat and Mass Transfer, 121, 2018. Crossref

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