NATURAL CONVECTION OF A HYBRID NANOFLUID-FILLED TRIANGULAR ANNULUS WITH AN OPENING

2016 ◽  
Vol 8 (6) ◽  
pp. 555-566 ◽  
Author(s):  
Fatih Selimefendigil ◽  
Ali J. Chamkha
Keyword(s):  
Natural Convection ◽  
Hybrid Nanofluid

Three-dimensional analysis on natural convection inside a T-shaped cavity with water-based CNT–aluminum oxide hybrid nanofluid

2019 ◽  
Vol 139 (3) ◽  
pp. 2089-2098 ◽  
Author(s):  
Mohammed A. Almeshaal ◽  
K. Kalidasan ◽  
Faouzi Askri ◽  
R. Velkennedy ◽  
Ali Sulaiman Alsagri ◽  
...  
Keyword(s):  
Natural Convection ◽  
Aluminum Oxide ◽  
Dimensional Analysis ◽  
Three Dimensional ◽  
Hybrid Nanofluid ◽  
Water Based

Magnetohydrodynamics Natural Convection in a Triangular Cavity Filled With a Cu-Al2O3/Water Hybrid Nanofluid With Localized Heating From Below and Internal Heat Generation

2018 ◽  
Vol 140 (7) ◽  
Author(s):  
A. M. Rashad ◽  
Ali J. Chamkha ◽  
Muneer A. Ismael ◽  
Taha Salah
Keyword(s):  
Natural Convection ◽  
Heat Generation ◽  
Volume Fraction ◽  
Internal Heat ◽  
Constant Heat Flux ◽  
Hybrid Nanofluid ◽  
Al2o3 Nanoparticles ◽  
Heater Element ◽  
Water Base ◽  
Generation Parameter

This study investigates the convective heat transfer of a hybrid nanofluid filled in a triangular cavity subjected to a constant magnetic field and heated by a constant heat flux element from below. The inclined side of the cavity is cooled isothermally while the remaining sides are thermally insulated. The finite difference method with the stream function-vorticity formulation of the governing equations has been utilized in the numerical solution. The problem is governed by several pertinent parameters namely, the size and position of the heater element, B = 0.2–0.8 and D = 0.3–0.7, respectively, the Rayleigh number, Ra = 102–106, the Hartmann number, Ha = 0–100, the volume fraction of the suspended nanoparticles, ϕ = 0–0.2, and the heat generation parameter Q = 0–6. The results show significant effect of increasing the volume fraction of the hybrid nanofluid when the natural convection is very small. Moreover, the hybrid nanofluid composed of equal quantities of Cu and Al2O3 nanoparticles dispersed in water base fluid has no significant enhancement on the mean Nusselt number compared with the regular nanofluid.

Magnetohydrodynamic Natural Convection Heat Transfer of Hybrid Nanofluid in a Square Enclosure in the Presence of a Wavy Circular Conductive Cylinder

2019 ◽  
Vol 12 (3) ◽  
Author(s):  
Tahar Tayebi ◽  
Ali J. Chamkha
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Convection Heat Transfer ◽  
Flow Characteristics ◽  
Hybrid Nanofluid ◽  
Square Enclosure ◽  
Convection Problem ◽  
Laminar Natural Convection ◽  
Natural Convection Problem ◽  
Volume Method

Abstract In this paper, steady natural convective heat transfer and flow characteristics of Al2O3-Cu/water hybrid nanofluid filled square enclosure in the presence of magnetic field has been investigated numerically. The enclosure is equipped with a wavy circular conductive cylinder. The natural convection in the cavity is induced by a temperature difference between the vertical left hot wall and the other right cold wall. The steady 2-D equations of laminar natural convection problem for Newtonian and incompressible mixture are discretized using the finite volume method. The effective thermal conductivity and viscosity of the hybrid nanofluid are calculated using Corcione correlations taking into consideration the Brownian motion of the nanoparticles. A numerical parametric investigation is carried out for different values of the nanoparticles volumic concentration, Hartmann number, Rayleigh number, and the ratio of fluid to solid thermal conductivities. According to the results, the corrugated conductive block plays an important role in controlling the convective flow characteristic and the heat transfer rate within the system.

Magnetohydrodynamic natural convection of hybrid nanofluid in a porous enclosure: numerical analysis of the entropy generation

2020 ◽  
Vol 141 (5) ◽  
pp. 1981-1992 ◽  
Author(s):  
Zaim Abdel-Nour ◽  
Abderrahmane Aissa ◽  
Fateh Mebarek-Oudina ◽  
A. M. Rashad ◽  
Hafiz Muhammad Ali ◽  
...  
Keyword(s):  
Natural Convection ◽  
Numerical Analysis ◽  
Entropy Generation ◽  
Hybrid Nanofluid ◽  
Porous Enclosure
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