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Numerical study on natural convection of Ag–MgO hybrid/water nanofluid inside a porous enclosure: A local thermal non-equilibrium model

Mehryan, S.A.M. ; Ghalambaz, Mohammad ; Chamkha, Ali J. ; Izadi, Mohsen

Powder technology, 2020-05, Vol.367, p.443-455 [Periódico revisado por pares]

Lausanne: Elsevier B.V

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Título:
Numerical study on natural convection of Ag–MgO hybrid/water nanofluid inside a porous enclosure: A local thermal non-equilibrium model
Autor: Mehryan, S.A.M. ; Ghalambaz, Mohammad ; Chamkha, Ali J. ; Izadi, Mohsen
Assuntos: Ag-MgO-water nanofluid ; Aluminum ; Computer simulation ; Convection ; Convective heat transfer ; Enclosures ; Finite element method ; Flow simulation ; Free convection ; Galerkin method ; Heat transfer ; Heat transfer coefficients ; Hybrid nanofluids ; LTNE model ; Magnesium oxide ; Mathematical models ; Metal foams ; Nanofluids ; Nanoparticles ; Natural convection ; Parameters ; Porosity ; Porous media ; Porous medium ; Silver ; Structured grids (mathematics) ; Thermal conductivity
É parte de: Powder technology, 2020-05, Vol.367, p.443-455
Descrição: This paper investigates the natural convection of Ag-MgO/water nanofluids within a porous enclosure using a Local Thermal Non-Equilibrium (LTNE) model. The Darcy model is applied to simulate the flow dynamics throughout the porous medium. Using non-dimensional parameters, the dimensionless form of the prevailing equations has been derived. Finally, the Galerkin finite element method is utilized to solve governing equations using a non-uniform structured grid, numerically. The key parameters of this study are Rayleigh number (10 ≤ Ra ≤ 1000), porosity (0.1 ≤ ε ≤ 0.9), nanoparticles volume fraction (0 ≤ φ ≤ 0.02), interface convective heat transfer coefficient (1 ≤ H ≤ 1000), and the thermal conductivity ratio of two porous phases (1 ≤ γ ≤ 10). It is indicated that dispersing Ag–MgO hybrid nanoparticles in the water strongly decreases the transport of heat through two phases of the porous enclosure. For glass ball and aluminum foam, by increasing the H from 1 to 1000, Qhnf would be 1.33 and 5.85 times, respectively, at φ = 2%. A simple view of the cavity filled with porous medium saturated by hybrid nanofluids. [Display omitted] •The natural convection of Ag-MgO/water nanofluids in a porous medium addressed.•The effects of local thermal non-equilibrium in the porous medium are taken into account.•Nanoparticles volume fraction is investigated for a dilute solution.•Dispersing Ag–MgO hybrid nanoparticles in the water deteriorates the heat transport.•The heat transfer rates through the fluid and solid phases enhance with an increment in γ.
Editor: Lausanne: Elsevier B.V
Idioma: Inglês

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Numerical study on natural convection of Ag–MgO hybrid/water nanofluid inside a porous enclosure: A local thermal non-equilibrium model

Mehryan, S.A.M. ; Ghalambaz, Mohammad ; Chamkha, Ali J. ; Izadi, Mohsen

Lausanne: Elsevier B.V

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