Numerical study of MHD nanofluid natural convection in a baffled U-shaped enclosure

Ma, Yuan; Mohebbi, Rasul; Rashidi, Majid; Yang, Zhigang; Sheremet, Mikhail А.

doi:10.1016/j.ijheatmasstransfer.2018.10.072

Cited by 174 publications

(63 citation statements)

References 58 publications

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“…The solutions of Equations (17) and (19) after substituting Equation (25) under the boundary conditions, (18) and (20), are obtained as: u 0 (y) = e −α 2 y (c 5 sin h(β 2 y) + c 6 cos h(β 2 y))…”

Section: Problem Descriptionmentioning

confidence: 99%

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MHD Nanofluids in a Permeable Channel with Porosity

Khan

Alqahtani

2019

Symmetry

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This paper introduces a mathematical model of a convection flow of magnetohydrodynamic (MHD) nanofluid in a channel embedded in a porous medium. The flow along the walls, characterized by a non-uniform temperature, is under the effect of the uniform magnetic field acting transversely to the flow direction. The walls of the channel are permeable. The flow is due to convection combined with uniform suction/injection at the boundary. The model is formulated in terms of unsteady, one-dimensional partial differential equations (PDEs) with imposed physical conditions. The cluster effect of nanoparticles is demonstrated in the C 2 H 6 O 2 , and H 2 O base fluids. The perturbation technique is used to obtain a closed-form solution for the velocity and temperature distributions. Based on numerical experiments, it is concluded that both the velocity and temperature profiles are significantly affected by φ. Moreover, the magnetic parameter retards the nanofluid motion whereas porosity accelerates it. Each H 2 O-based and C 2 H 6 O 2 -based nanofluid in the suction case have a higher magnitude of velocity as compared to the injections case.

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Section: Problem Descriptionmentioning

confidence: 99%

“…They considered the effect of MHD, suction/injection, and heat generation/absorption in their study. Hosseinzadeh et al [20] investigated the MHD squeezing flow of nonfluid in a channel. They presented analytical solutions by using similarity transformation and the perturbation technique.…”

Section: Introductionmentioning

confidence: 99%

MHD Nanofluids in a Permeable Channel with Porosity

Khan

Alqahtani

2019

Symmetry

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“…However, recent studies showed that the magnetic field effects can be beneficial to enhance the convection for configurations that produce multiple re-circulations as in vented cavities [23] or in separated flows as encountered in sudden area expansion geometries [24,25]. Magnetic field effects are recently used with nanofluids [26][27][28][29]. The technology of nanofluids were successfully implemented in various technological applications related to thermal science such as in solar power, thermal energy storage, refrigeration, thermal management and convective heat transfer control [30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Effects of a Rotating Cone on the Mixed Convection in a Double Lid-Driven 3D Porous Trapezoidal Nanofluid Filled Cavity under the Impact of Magnetic Field

2020

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Effects of a rotating cone in 3D mixed convection of CNT-water nanofluid in a double lid-driven porous trapezoidal cavity is numerically studied considering magnetic field effects. The numerical simulations are performed by using the finite element method. Impacts of Richardson number (between 0.05 and 50), angular rotational velocity of the cone (between −300 and 300), Hartmann number (between 0 and 50), Darcy number (between 10 − 4 and 5 × 10 − 2 ), aspect ratio of the cone (between 0.25 and 2.5), horizontal location of the cone (between 0.35 H and 0.65 H) and solid particle volume fraction (between 0 and 0.004) on the convective heat transfer performance was studied. It was observed that the average Nusselt number rises with higher Richardson numbers for stationary cone while the effect is reverse for when the cone is rotating in clockwise direction at the highest supped. Higher discrepancies between the average Nusselt number is obtained for 2D cylinder and 3D cylinder configuration which is 28.5% at the highest rotational speed. Even though there are very slight variations between the average Nu values for 3D cylinder and 3D cone case, there are significant variations in the local variation of the average Nusselt number. Higher enhancements in the average Nusselt number are achieved with CNT particles even though the magnetic field reduced the convection and the value is 84.3% at the highest strength of magnetic field. Increasing the permeability resulted in higher local and average heat transfer rates for the 3D porous cavity. In this study, the aspect ratio of the cone was found to be an excellent tool for heat transfer enhancement while 95% enhancements in the average Nusselt number were obtained. The horizontal location of the cone was found to have slight effects on the Nusselt number variations.

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“…Ma et al [6] studied effects of the magnetic field and nanofluid on the natural convection heat transfer in a baffled U-shaped enclosure and shown that the heat transfer enhancement by introducing nanofluid decreases as increasing Rayleigh number. Izadi et al [7] studied natural convective heat transfer of a magnetic nanofluid in a porous enclosure and found that the Nusselt number decreases first with increasing the strength ratio of the two magnetic sources.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Heat Transfer Enrichment in Hydromagnetic Flow of Hybrid Nanofluid Along Vertical Wavy Surface

Iqbal¹,

Mustafa²,

Ghaffari³

2019

JMAG

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The hybrid nanofluids are novel nanofluids and can be made by adding different types of nanoparticles in the plain fluid. The mathematical modeling of hybrid nanofluid under the magnetic influence over a vertical wavy surface is developed in the present theoretical investigation. The analysis is performed for hybrid nanofluid consisting of Al 2 O 3-SiO 2 nanoparticles and compared with SiO 2 nanoparticle. The theoretical results also indicate that Al 2 O 3-SiO 2 water hybrid nanofluid have higher heat transfer rate when compared with SiO 2-water nanofluid. In hybrid nanofluid, the choice of a suitable mixture of nanoparticles can lead to desire heat transfer phenomena. The implicit finite difference scheme is utilized for solution purposes. Results are presented in tabular and graphical form for the choice of suitable parameters.

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Numerical study of MHD nanofluid natural convection in a baffled U-shaped enclosure

Cited by 174 publications

References 58 publications

MHD Nanofluids in a Permeable Channel with Porosity

MHD Nanofluids in a Permeable Channel with Porosity

Effects of a Rotating Cone on the Mixed Convection in a Double Lid-Driven 3D Porous Trapezoidal Nanofluid Filled Cavity under the Impact of Magnetic Field

Analysis of Heat Transfer Enrichment in Hydromagnetic Flow of Hybrid Nanofluid Along Vertical Wavy Surface

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