MHD Heat Transfer in W-Shaped Inclined Cavity Containing a Porous Medium Saturated with Ag/Al 2 O 3 Hybrid Nanofluid in the Presence of Uniform Heat Generation/Absorption

Mohamed Dhia Massoudi, Mohamed Bechir Ben Hamida, Hussein A. Mohammed and Mohammed A. Almeshaal
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Mohamed Dhia Massoudi: Research Unit of Ionized Backgrounds and Reagents Studies, Preparatory Institute for Engineering Studies of Monastir (IPEIM), University of Monastir, Monastir 5019, Tunisia
Mohamed Bechir Ben Hamida: Research Unit of Ionized Backgrounds and Reagents Studies, Preparatory Institute for Engineering Studies of Monastir (IPEIM), University of Monastir, Monastir 5019, Tunisia
Hussein A. Mohammed: School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia
Mohammed A. Almeshaal: Department of Mechanical Engineering, College of Engineering, Al Imam Mohammad Ibn Saud Islamic University, Riyadh 11432, Saudi Arabia

Energies, 2020, vol. 13, issue 13, 1-21

Abstract: In this paper, a 2D numerical study of natural convection heat transfer in a W-shaped inclined enclosure with a variable aspect ratio was performed. The enclosure contained a porous medium saturated with Ag/Al 2 O 3 hybrid nanofluid in the presence of uniform heat generation or absorption under the effect of a uniform magnetic field. The vertical walls of the enclosure were heated differentially; however, the top and bottom walls were kept insulated. The governing equations were solved with numerical simulation software COMSOL Multiphysics which is based on the finite element method. The results showed that the convection heat transfer was improved with the increase of the aspect ratio; the average Nusselt number reached a maximum for an aspect ratio (AR) = 0.7 and the effect of the inclination was practically negligible for an aspect ratio of AR = 0.7. The maximum heat transfer performance was obtained for an inclination of ω = 15 and the minimum is obtained for ω = 30 . The addition of composite nanoparticles ameliorated the convection heat transfer performance. This effect was proportional to the increase of Rayleigh and Darcy numbers, the aspect ratio and the fraction of Ag in the volumetric fraction of nanoparticles.

Keywords: free convection; W-shaped inclined enclosure; porous medium; hybrid nanofluid; uniform heat generation or absorption (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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