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Journal of Porous Media
Fator do impacto: 1.752 FI de cinco anos: 1.487 SJR: 0.43 SNIP: 0.762 CiteScore™: 2.3

ISSN Imprimir: 1091-028X
ISSN On-line: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v16.i12.40
pages 1107-1118

MIXED CONVECTION OF MICROPOLAR FLUIDS IN A VERTICAL WAVY CHANNEL SATURATED WITH POROUS MEDIA

K. Y. Hung
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, No. 415, Jiangong Road, Sanmin District, Kaohsiung 80778, Taiwan, R.O.C.
Tsna-Hui Hsu
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, No. 415, Jiangong Road, Sanmin District, Kaohsiung 80778, Taiwan, R.O.C.
J. W. Lin
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, No. 415, Jiangong Road, Sanmin District, Kaohsiung 80778, Taiwan, R.O.C.

RESUMO

Combined convection of micropolar fluids in a vertical wavy channel saturated with porous media was studied. The coordinate transformation scheme was employed for the numerical calculation. The numerical results predict that the implicit properties of micropolar fluid influence the flow resistance and the heat transfer rate in the channel. Furthermore, as the heated surface is bulged and sunken periodically, the corrugated boundary conditions cause change to the flow fields with further influence on heat transfer efficiency. This article also finds that the increased heat transfer areas by corrugation are sufficient to counteract the heat resistance caused by flowing inconvenience. Therefore all the heat transfer efficiency of wavy channels is higher than that for flat ones. For higher Reynolds numbers, faster flowing velocities in the trough walls result in higher Nusselt numbers. Because the porous media may provide available contact surface areas between both solid and liquid for heat transfer, the channel saturated with porous media enlarges the effect of heat transfer. When the Darcy number is increased, both the surface friction and vortex resistance decrease. In addition, the velocities and heat transfer nearby the wavy wall also decrease. However, the heat transfer efficiency of channel flow saturated with porous media is higher than that of singlephase fluid flow.


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