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Journal of Porous Media
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ISSN Druckformat: 1091-028X
ISSN Online: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v17.i12.50
pages 1075-1091

NUMERICAL SOLUTION OF FLUID FLOW AND CONJUGATE HEAT TRANSFER IN A CHANNEL FILLED WITH FIBROUS POROUS MEDIA-A LATTICE BOLTZMANN METHOD APPROACH

Alireza Salehi
Mechanical Engineering Department, Amirkabir University of Technology, Hafez Ave., Tehran, Iran; Isfahan University of Technology, Mechanical Engineering Department, Isfahan, Iran
Abbas Abbassi
Department of Mechanical Engineering, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Ave., P.O. Box 15875-4413, Tehran, Iran
Mohsen Nazari
Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran

ABSTRAKT

In this paper, numerical simulation of fluid flow and heat transfer in a 2D planar channel with straight walls, which is occupied partially and fully with fibrous porous media, is performed by the lattice Boltzmann method. A set of fibrous arrays with square cross section, representing a porous medium, is placed at specific location of this channel perpendicular to the flow direction. A discrete pore-scale level model with standard bounce-back boundary condition on solid fibers has been used due to direct modeling of ordered fibrous medium. Considering the local thermal nonequilibrium led to define another distribution function for the solid phase of porous media. The criterion for enhancement in heat transfer due to the presence of fibrous porous structures is local and average walls Nusselt numbers. The obtained results indicate that porosity, aspect ratio, and relative location of the fibrous are the main parameters that lead to variation of the local and average Nusselt number in the characteristics length of the channel, which is filled by fibrous structures symmetrically and asymmetrically with respect to the centerline ofthe channel. Comparison between fully and partially filled channels shows that in the case of asymmetric arrangement, especially at high porosity, the increase in pressure drop and average Nusselt number on the upper wall are lower and higher than symmetric ones, respectively.


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