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Natural convection in a saturated variable-porosity medium due to microwave heating / Watit Pakdee in Journal of heat transfer, Vol. 133 N° 6 (Juin 2011) 

Public ISBD [article]  in Journal of heat transfer > Vol. 133 N° 6 (Juin 2011) . - pp. [062502/1-8] Titre : Natural convection in a saturated variable-porosity medium due to microwave heating Type de document : texte imprimé Auteurs : Watit Pakdee, Auteur ; Phadungsak Rattanadecho, Auteur Année de publication : 2011 Article en page(s) : pp. [062502/1-8] Note générale : Physique Langues : Anglais (eng) Mots-clés : Microwave  heating  Variable  porosity  Natural  convection  Saturated  porous  media  Rectangular  waveguide Index. décimale : 536 Chaleur. Thermodynamique Résumé : Microwave heating of a porous medium with a nonuniform porosity is numerically investigated based on a proposed numerical model. A two-dimensional variation of porosity of the medium is considered. The generalized non-Darcian model developed takes into account the presence of a solid drag and the inertial effect. The transient Maxwell's equations are solved by using the finite difference time domain method to describe the electromagnetic field in the waveguide and medium. The temperature profile and velocity field within a medium are determined by solution of the momentum, energy, and Maxwell's equations. The coupled nonlinear set of these equations is solved using the SIMPLE algorithm. In this work, a detailed parametric study is conducted on heat transport inside a rectangular enclosure filled with a saturated porous medium of constant or variable porosity. The numerical results agree well with the experimental data. Variations in porosity significantly affect the microwave heating process as well as the convective flow pattern driven by microwave energy. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Natural convection in a saturated variable-porosity medium due to microwave heating [texte imprimé] / Watit Pakdee, Auteur ; Phadungsak Rattanadecho, Auteur . - 2011 . - pp. [062502/1-8]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 6 (Juin 2011) . - pp. [062502/1-8] Mots-clés : Microwave  heating  Variable  porosity  Natural  convection  Saturated  porous  media  Rectangular  waveguide Index. décimale : 536 Chaleur. Thermodynamique Résumé : Microwave heating of a porous medium with a nonuniform porosity is numerically investigated based on a proposed numerical model. A two-dimensional variation of porosity of the medium is considered. The generalized non-Darcian model developed takes into account the presence of a solid drag and the inertial effect. The transient Maxwell's equations are solved by using the finite difference time domain method to describe the electromagnetic field in the waveguide and medium. The temperature profile and velocity field within a medium are determined by solution of the momentum, energy, and Maxwell's equations. The coupled nonlinear set of these equations is solved using the SIMPLE algorithm. In this work, a detailed parametric study is conducted on heat transport inside a rectangular enclosure filled with a saturated porous medium of constant or variable porosity. The numerical results agree well with the experimental data. Variations in porosity significantly affect the microwave heating process as well as the convective flow pattern driven by microwave energy. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]