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DOUBLE-DIFFUSIVE MIXED CONVECTION IN A COMPOSITE POROUS ENCLOSURE WITH ARC-SHAPED MOVING WALL: TORTUOSITY EFFECT

Volumen 21, Ausgabe 4, 2018, pp. 343-362
DOI: 10.1615/JPorMedia.v21.i4.40
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ABSTRAKT

A double-diffusive mixed convection in a lid-driven partially layered porous enclosure is addressed numerically in this paper. The mass diffusivity coefficient of the porous medium is determined based on the tortuosity and porosity model. The left wall is kept at constant hot temperature and high concentration. The right wall is arc shaped, being driven, and kept at constant cold temperature and low concentration. The horizontal walls are thermally insulated. The studied pertinent parameters are the Lewis number (0.5 ≤ Le ≤ 5), buoyancy ratio (–7 ≤ N ≤ 7), arc-shaped wall speed (–100 ≤ ω ≤ 100), and thermal Rayleigh number (103 ≤ Ra ≤ 106). The other fixed parameters are the Prandtl number, Pr = 0.71 (air), Darcy number, Da = 10-3, and porous layer thickness Xp = 0.5. The results show that for Ra ≥ 105, there is a significant effect of considering the real coefficient of mass diffusivity on both heat and mass transfer. Interesting competitions among the buoyancy ratio, direction of the arc-shaped wall speed, and Lewis number are recorded and discussed in detail.

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