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Entropy Generation for Pulsating Flow in a Composite Fluid/Porous System

Volume 11, Edição 6, 2008, pp. 557-574
DOI: 10.1615/JPorMedia.v11.i6.40
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RESUMO

A numerical study of entropy generation for pulsating flow within a cylinder partially filled with a porous medium and exposed to a constant heat flux at the wall was carried out in the laminar flow regime. The porous substrate is attached to the inner side of the cylinder axis, while the upper side is filled with a pure fluid phase. The flow within the porous domain is modeled by the Brinkman-Lapwood-Forchheimer-extended Darcy model. The mathematical model for energy transport is based on the local thermal equilibrium assumption. The control volume-based finite element method is used to solve the differential system equations with an unequal order velocity-pressure interpolation. The obtained numerical code was validated with the closest available published results. A good agreement was shown. The numerical results of the flow, heat transfer, and entropy generation are presented and discussed. A comprehensive analysis of the influence of the amplitude pulsation, the frequency pulsation, the thermal conductivity ratio, the Darcy number, the porous layer thickness, and the modified Brinkman number on the entropy generation rate, as well as on the Bejan number, is also investigated.

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