Magnetohydrodynamics convection in nanofluids‐filled cavities: A review

Molana, Maysam; Zarrinderafsh, Vahid; Chamkha, Ali J.; Izadi, Sina; Rafizadeh, Siamak

doi:10.1002/htj.21670

Cited by 18 publications

(7 citation statements)

References 131 publications

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“…In the last several decades, the heat transport of nanofluids in various shapes with varying outset and boundary conditions has been a popular research point. This is explained by the fact that these geometries have been widely used in real-world applications, such as building thermal management, electronic device cooling, biochemical and food processing, and renewable energy applications [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. Raizah et al [ 8 ] examined nanofluid natural convection (NC) flow inside a V-shaped cavity saturated with porous media.…”

Section: Introductionmentioning

confidence: 99%

Natural Convection within Inversed T-Shaped Enclosure Filled by Nano-Enhanced Phase Change Material: Numerical Investigation

et al. 2022

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Energy saving has always been a topic of great interest. The usage of nano-enhanced phase change material NePCM is one of the energy-saving methods that has gained increasing interest. In the current report, we intend to simulate the natural convection flow of NePCM inside an inverse T-shaped enclosure. The complex nature of the flow results from the following factors: the enclosure contains a hot trapezoidal fin on the bottom wall, the enclosure is saturated with pours media, and it is exposed to a magnetic field. The governing equations of the studied system are numerically addressed by the higher order Galerkin finite element method (GFEM). The impacts of the Darcy number (Da = 10−2–10−5), Rayleigh number (Ra = 103–106), nanoparticle volume fraction (φ = 0–0.08), and Hartmann number (Ha = 0–100) are analyzed. The results indicate that both local and average Nusselt numbers were considerably affected by Ra and Da values, while the influence of other parameters was negligible. Increasing Ra (increasing buoyancy force) from 103 to 106 enhanced the maximum average Nusselt number by 740%, while increasing Da (increasing the permeability) from 10−5 to 10−2 enhanced both the maximum average Nusselt number and the maximum local Nusselt number by the same rate (360%).

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Section: Introductionmentioning

confidence: 99%

Natural Convection within Inversed T-Shaped Enclosure Filled by Nano-Enhanced Phase Change Material: Numerical Investigation

et al. 2022

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“…If the conductive nanoparticles are suspended within the base fluid, magnetohydrodynamic (MHD) natural convection should be concerned. MHD also has wide and important applications such as speaker cooling, nuclear reactor cooler, micro-electromechanical systems, chemical and biological engineering and plasma physics (Giwa et al , 2020; Molana et al , 2020).…”

Section: Introductionmentioning

confidence: 99%

Conjugate MHD natural convection of hybrid nanofluids in a square enclosure containing a complex conductive cylinder

Wang

Li²,

Xi³

et al. 2022

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Purpose The purpose of this study is to investigate the enhancement and suppression of heat transfer for hybrid nanofluids (Cu–Al2O3/water) in a square enclosure containing a thermal-conductive cylinder when the Lorentz force is applied to the hybrid nanofluids. Design/methodology/approach Since the inner conductive cylinder in present research has a complex geometry, an in-house meshless method, namely, the local radial basis function (LRBF) method, is applied to solve the 2 dimensional (2D) incompressible Navier–Stokes equation in the fluid domain and Fourier heat conduction equation in solid domain. The solid–fluid interface remains the physical continuity of temperature and heat flux. Only the Lorentz force is considered for the presence of the magnetic field. The conjugate natural convection is assumed to be steady, thus only fully developed heat exchange from the nanofluids to solid or vice versa is comprehensively investigated. Findings It can be concluded that Lorentz force plays a more significant role than hybrid nanofluids in enhancing/suppressing heat transfer when the orientation of magnetic field is the same to the x direction. The thermal conductivity ratio can dramatically change the isotherms and streamlines as well as the mean value of the Nusselt number, resulting in totally different heat transfer phenomena. The included angle of magnetic field also has a significant effect on the heat transfer rate when it changes from horizontal to vertical. Research limitations/implications The constant thermo-physical properties of incompressible fluid and the 2D steady flow are considered in this study. Originality/value The conjugate MHD natural convection of hybrid nanofluids is numerically investigated by an in-house meshless LRBF method. The enhancement and suppression of heat transfer under the combined influence of the volume fraction of nanoparticles, Hartmann number and the thermal conductivity ratio are comprehensively investigated.

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“…Nowadays, the NF have been defined as the suspension of nano-scale particles and traditional heat transfer fluids like water and oil aiming at enhancing the thermo-physical properties, including viscosity, density, specific heat transfer, and thermal conductivity, compared to the pure base fluid. NF promising properties are proven in a diverse range of applications including, but not restricted to, impingement jets [3], automotive [4], renewable energies [5,6], heating and tempering processes [7][8][9], heat exchangers [10], nuclear reactors [11,12], electronic chips cooling [7,13], lubrication [14,15], combustion [16,17], and medicine [18,19], etc.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Hot Blocks Geometry and Particle Migration on Heat Transfer and Entropy Generation of a Novel I-Shaped Porous Enclosure

et al. 2021

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This paper studied the cooling performance of a hot electronic chip using nanofluids (NF) mixed convection, implementing Buongiorno’s model of the NF simulation. The NF were assumed water-Al2O3 nanoparticles (NP) in the range of 0 to 4% of volume concentration. Six different problems of the combinations of three internal hot blocks, including triangular, square, and circular geometries, and two porous media, including sand and compact metallic powder, were numerically solved. To discretize the governing equations, a finite control volume method was applied. As most of the proposed correlations for the thermophysical properties of the NF were inaccurate, especially for thermal conductivity, a new predictive correlation was proposed using the multi-variable regression method with acceptable accuracy. It was found that the cooling performance improved with any increase in the NP loading. A higher nanoparticle concentration yielded better cooling characteristics, which was 11.93% for 4% volume. The sand porous medium also yielded a much higher value of the normalized Nusselt number (Nu) compared to the other medium. The entropy generation (EG) enhancement was maximum for the triangular hot block in a sand porous cavity.

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Magnetohydrodynamics convection in nanofluids‐filled cavities: A review

Cited by 18 publications

References 131 publications

Natural Convection within Inversed T-Shaped Enclosure Filled by Nano-Enhanced Phase Change Material: Numerical Investigation

Natural Convection within Inversed T-Shaped Enclosure Filled by Nano-Enhanced Phase Change Material: Numerical Investigation

Conjugate MHD natural convection of hybrid nanofluids in a square enclosure containing a complex conductive cylinder

The Effects of Hot Blocks Geometry and Particle Migration on Heat Transfer and Entropy Generation of a Novel I-Shaped Porous Enclosure

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