Publicou 18 edições por ano
ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561
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EFFECT OF THE ASPECT RATIO ON NATURAL CONVECTION IN A POROUS CAVITY WITH A SINUSOIDAL ACTIVE THERMAL WALL
RESUMO
This study reports a numerical investigation of a natural convective flow and heat transfer in a rectangular cavity filled with a heat-generating porous medium by adopting a local thermal nonequilibrium model. All of the walls of the enclosure are adiabatic except for the left wall, which is partially heated and cooled. The results reveal that, as the periodicity is decreased on increase in N, the streamlines vary in different patterns, including simultaneous clockwise and counterclockwise rotations when N > 1. The temperature fields near the left wall and local Nusselt number of the left wall vary periodically because of the sinusoidal boundary condition. The sinusoidal symmetrical velocity profiles V are observed, and the vertical velocity increases with an increasing aspect ratio. The sinusoidal local Nusselt number profiles are observed with increasing N, and the wave amplitude of the local Nusselt number decreases with an increasing aspect ratio. The aspect ratio has a significant influence on the average Nusselt number of the fluid phase. On the contrary, it has a weak effect on the Nusselt number of the solid phase. There exists an optimal aspect ratio value Ar = 5 that can significantly enhance the heat transfer of the porous cavity.