Abstract
The current article aims to discuss the natural convection heat transfer of Ag/Al2O3-water hybrid filled in an enclosure subjected to a uniform magnetic field and provided with a rotating cylinder and an inner undulated porous layer. The various thermo-physical parameters are investigated such as Rayleigh number (100 le Ra le 100000), Hartmann number (0 le Ha le 100), and the nanoparticles concentration (0.02 le phi le 0.08). Likewise, the rotational speed of the cylinder (- 4000 le omega le + 4000), as well as several characteristics related to the porous layer, are examined li its porosity (0.2 le varepsilon le 0.8), Darcy number (- 100000 le Da le - 100) which indicates the porous medium permeability and the number of undulations (0 le N le 4). The calculations are carried out based on the Galerkin Finite element method (GFEM) to present the streamlines, isotherms, entropy generation, and average Nusselt numbers in details. The main results proved that increment of Rayleigh number and Darcy number enhances heat transfer convection within the enclosure. Whilst, the porosity presents a minimal impact. Also, the rotational speed in a positive direction has a favorable influence on the heat transfer dispersion across the cavity.
Highlights
The current article aims to discuss the natural convection heat transfer of Ag/Al2O3-water hybrid filled in an enclosure subjected to a uniform magnetic field and provided with a rotating cylinder and an inner undulated porous layer
The computational study conducted by Mebarek-Oudina et al.[13] on the convection heat transfer inside a porous chamber filled with Ag-MgO hybrid nanofluid indicated that rising the Rayleigh number leads to accelerate the fluid flow strength
Many parameters have been used in this study such as Rayleigh number ( Ra = 102, 103, 104, 105 ), Hartmann number ( Ha = 0, 25, 50, 100 ), nanoparticles concentration ( φ = 0.02, 0.04, 0.06, 0.08 ), rotational speed of the cylinder ( ω = −4000, −2000, 0, 2000, +4000 ), porosity ( ε = 0.2, 0.4, 0.6, 0.8 ), Darcy number ( Da = 10−5, 10−4, 10−3, 10−2 ) and undulations ( N = 0, 1, 2, 4 )
Summary
The current article aims to discuss the natural convection heat transfer of Ag/Al2O3-water hybrid filled in an enclosure subjected to a uniform magnetic field and provided with a rotating cylinder and an inner undulated porous layer. Pordanjani et al.[9] studied the free convection of the alumina-water nanofluid in a cavity They examined the effect of the magnetic flux on heat transfer efficiency. Alnaqi et al.[10] studied the magnetic field impact of the Al2O3-water nanofluid in the inclined square cavity It was exposed from their findings, the Nusselt number increase for an upper Rayleigh number and a lower Hartmann number. Fares et al.[12] investigated the behaviour of the free convection heat inside a porous cavity equipped with a rotating cylinder Their findings confirmed the significant boosting impact of increasing Ra and Da on the heat exchange efficiency. The computational study conducted by Mebarek-Oudina et al.[13] on the convection heat transfer inside a porous chamber filled with Ag-MgO hybrid nanofluid indicated that rising the Rayleigh number leads to accelerate the fluid flow strength. They found that using nanofluid instead of water enhances the heat transfer intensity increases in all cases
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