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Special Topics & Reviews in Porous Media: An International Journal
ESCI SJR: 0.277 SNIP: 0.52 CiteScore™: 1.3

ISSN Печать: 2151-4798
ISSN Онлайн: 2151-562X

Special Topics & Reviews in Porous Media: An International Journal

DOI: 10.1615/SpecialTopicsRevPorousMedia.2020030589
pages 189-202

DOUBLE DIFFUSIVE NATURAL CONVECTION AND ENTROPY GENERATION THROUGH A TRAPEZOIDAL POROUS CAVITY

Souad Marzougui
Gabès University, Chemical and Process Engineering Department, Engineers National School of Gabès, Applied Thermodynamics Unit, Omar Ibn El Khattab Street, 6029 Gabès, Tunisia
Ali Mchirgui
Gabès University, Chemical and Process Engineering Department, Engineers National School of Gabès, Applied Thermodynamics Unit, Omar Ibn El Khattab Street, 6029 Gabès, Tunisia
Mourad Magherbi
Gabès University, Civil Engineering Department, Higher Institute of Applied Sciences and Technology, Omar Ibn El Khattab Street, 6029 Gabès, Tunisia

Краткое описание

The present paper provides a numerical investigation about heat and mass transfer and entropy generation in a trapezoidal porous cavity saturated with a binary mixture of perfect gas and submitted to double diffusive convection. The analysis is performed using Darcy−Brinkman formulation with the Boussinesq approximation. The set of coupled equations of mass, momentum, energy, and species conservation are solved using the control volume finite-element method. Effects of buoyancy ratio and medium permeability and of the aspect ratio of the cavity on different irreversibilities are studied. It was found that entropy generation considerably depends on the buoyancy forces and reaches a minimum for a specific value of buoyancy ratio. A balance between Darcy viscous dissipation and other irreversibilities affect the entropy generation behavior. The variation of total entropy generation could be driven by heat transfer and diffusion or by fluid friction according to aspect ratio and Darcy number values.

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