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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.v18.i12.40
pages 1201-1220

HEAT TRANSFER ENHANCEMENT IN AN ASYMMETRICALLY HEATED CHANNEL PARTIALLY FILLED WITH FIBROUS POROUS MEDIA−A LBM APPROACH

Mohammad Abbaszadeh
Shiraz University, Mechanical Engineering Department, Shiraz, Iran
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

ABSTRAKT

In this study, conjugate heat transfer in a 2D planar channel partially filled with fibrous porous media is numerically investigated using the lattice Boltzmann method. The considered porous media is formed by a regular matrix of solid fibers, modeled as square obstacles and located in a cross flow. Asymmetrical thermal boundary conditions are implemented to the channel walls. Pore scale simulation combined with a local thermal nonequilibrium assumption are applied to the solid phase. Average Nusselt number on the constant temperature wall is reported as the criterion for heat transfer enhancement. Effects of geometrical parameters such as blockage ratio, porous block eccentricity, porosity, and some thermophysical parameters such as Reynolds and Prandtl numbers are investigated. Apart from confirming the efficiency of the partially filled channel over the fully filled one, obtained results demonstrate the existence of optimum values for the blockage ratio and porous block eccentricity. Also, heat transfer and pressure drop are increased as the size of the fibers increases. Moreover, decreasing the porosity, by adding number of fibers in the porous block, can increase the value of the average Nusselt number.


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