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Journal of Porous Media

Impact factor: 1.035

ISSN Print: 1091-028X
ISSN Online: 1934-0508

Volumes:
Volume 20, 2017 Volume 19, 2016 Volume 18, 2015 Volume 17, 2014 Volume 16, 2013 Volume 15, 2012 Volume 14, 2011 Volume 13, 2010 Volume 12, 2009 Volume 11, 2008 Volume 10, 2007 Volume 9, 2006 Volume 8, 2005 Volume 7, 2004 Volume 6, 2003 Volume 5, 2002 Volume 4, 2001 Volume 3, 2000 Volume 2, 1999 Volume 1, 1998

Journal of Porous Media

DOI: 10.1615/JPorMedia.v20.i3.40
pages 227-247

HEAT TRANSFER AND ENTROPY GENERATION IN POROUS MICRODUCT WITH SLIP BOUNDARY CONDITION USING LATTICE BOLTZMANN METHOD UNDER NONEQUILIBRIUM CONDITIONS

Raja Rabhi
Laboratoire d'Etudes des Systèmes Thermiques et Energétiques, Université de Monastir, Ecole Nationale d'Ingénieurs de Monastir, Rue Ibn Eljazzar, 5019 Monastir, Tunisia
Bayssain Amami
Laboratoire d'Etudes des Systèmes Thermiques et Energétiques, Université de Monastir, Ecole Nationale d'Ingénieurs de Monastir, Rue Ibn Eljazzar, 5019 Monastir, Tunisia
Hacen Dhahri
Laboratoire d'Etudes des Systèmes Thermiques et Energétiques, Université de Monastir, Ecole Nationale d'Ingénieurs de Monastir, Rue Ibn Eljazzar, 5019 Monastir, Tunisia
Abdallah Mhimid
Laboratoire d'Etudes des Systèmes Thermiques et Energétiques, Université de Monastir, Ecole Nationale d'Ingénieurs de Monastir, Rue Ibn Eljazzar, 5019 Monastir, Tunisia

ABSTRACT

Solar water heating systems prove to be an effective technology for converting solar energy into thermal energy. The efficiency of solar thermal conversion is important compared to solar electrical direct conversion systems. Therefore this paper improves numerically the thermal efficiency of solar water heaters wherein we try to improve the convective heat transfer. The Darcy-Brinkman-Forchheimer (DBF) model is used to establish momentum equations for porous media, while the local thermal nonequilibrium model is adopted to represent the fluid–solid energy exchange. The solutions for velocity and temperature are obtained considering the viscous dissipation effect. This study details the effects of variations in the Knudsen number, Darcy number, and other dimensionless numbers on the velocity, temperature, Nusselt number, and entropy generation to illustrate important fundamental and practical results. In fact, using porous materials with high permeability, including viscous dissipation, enhances heat transfer.