A review of magnetic field influence on natural convection heat transfer performance of nanofluids in square cavities

Giwa, Solomon O.; Sharifpur, Mohsen; Ahmadi, Mohammad Hossein; Meyer, Josua P.

doi:10.1007/s10973-020-09832-3

Cited by 148 publications

(56 citation statements)

References 237 publications

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“…The enhancement of heat transfer rate (HTR) by adding nanofluids is one motivation behind these studies. Several types of research have focused on the HTR of nanofluids [9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Straight, Inclined and Curved Fins on Natural Convection and Entropy Generation of a Nanofluid in a Square Cavity Influenced by a Magnetic Field

et al. 2021

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In this paper, the free convective heat transfer of nanofluids in a square cavity is simulated using a numerical method. The angle of the cavity could be changed in the horizontal axis from 0 to 90 degrees. The cavity is exposed under a constant magnetic field. Two opposite walls of the cavity are cold and warm, and the rest of the walls are insulated. On the hot wall, there are two fins with the same wall temperature. The equations were discretized by the finite volume method (FVM) and then solved using the SIMPLE algorithm. Three different fin configurations (straight, inclined and curved) were studied in terms of heat transfer rate and generation of entropy. According to the simulation results, the heat transfer rate was improved by tilting the fins toward the top or bottom of the cavity. At Ra = 105 and Ha = 20, the maximum heat transfer rate was achieved at a cavity inclination of 90° and 45°, respectively, for straight and curved fins. In the horizontal cavity, heat transfer rate could be improved up to 6.4% by tilting the fins and up to 4.9% by warping them. Increasing the Hartmann number from 0 to 40 reduced the Nusselt number and entropy generation by 37.9% and 33.8%, respectively.

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Section: Introductionmentioning

confidence: 99%

Effect of Straight, Inclined and Curved Fins on Natural Convection and Entropy Generation of a Nanofluid in a Square Cavity Influenced by a Magnetic Field

et al. 2021

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“…Chaabane and Jemni [15] studied the MHD natural convection on linearly heated cavities. Giwa et al [16] reviewed the overall influence of magnetic field effect on square cavities of various combinations of thermal and velocity boundaries. Al-Kouz et al [17] studied the free convective rarefied gas flow in an inclined and oblique wave cavity.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modelling of MHD Natural Convection in a Linearly Heated Porous Cavity

Lawrence¹,

Kumar²

2021

MMEP

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A linear increase in thermal boundaries towards the bottom of the porous cavity is considered for numerical flow analysis on MHD natural convection. The two-dimensional square shaped cavity is filled with the Cu-water nanofluid. The dimensionless equations are considered to interpret the fluid and heat flow inside the cavity with respect to the desired boundaries. The governing equations are solved using the finite difference techniques. The relevant dimensionless parameters used in the present study are Rayleigh number, Darcy number, solid volume fraction of the nanoparticles and Hartmann number to obtain the flow fields. Heatline flows picturization techniques involved in the study analyze the heat flow inside the cavity. As the Rayleigh number and Darcy number increases, an increase in streamlines flow velocity and convection heat transfer is observed. Convective heat transfer is interrupted by increasing the applied magnetic field effects. An improvement in the heat transfer is noticed by increasing the solid volume fraction of the particles.

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“…Due to the improvements in industries, many researchers focused on boosting the heat transfer (Kalbasi, 2021;Giwa et al, 2020). The incorporation of nanomaterials or nanofluids is another important passive method that has attracted the attention of researchers owing to significant developments in the field of materials science in recent decades (Abedi et al, 2019;Keyvani et al, 2019;Parsa et al, 2020;Tian et al, 2020;Torosyan et al, 2020;Giwa et al, 2021;Parsa, 2021;Parsa et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

The Influence of Combined Turbulators on the Hydraulic-Thermal Performance and Exergy Efficiency of MWCNT-Cu/Water Nanofluid in a Parabolic Solar Collector: A Numerical Approach

2021

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The present research benefits from the finite volume method in investigating the influence of combined turbulators on the thermal and hydraulic exergy of a parabolic solar collector with two-phase hybrid MWCNT-Cu/water nanofluid. All parabolic geometries are produced using DesignModeler software. Furthermore, FLUENT software, equipped with a SIMPLER algorithm, is applied for analyzing the performance of thermal and hydraulic, and exergy efficiency. The Eulerian–Eulerian multiphase model and k-ε were opted for simulating the two-phase hybrid MWCNT-Cu/water nanofluid and turbulence model in the collector. The research was analyzed in torsion ratios from 1 to 4, Re numbers from 6,000 to 18,000 (turbulent flow), and the nanofluid volume fraction of 3%. The numerical outcomes confirm that the heat transfer and lowest pressure drop are relevant to the Re number of 18,000, nanofluid volume fraction of 3%, and torsion ratio of 4. Furthermore, in all torsion ratios, rising Re numbers and volume fraction lead to more exergy efficiency. The maximum value of 26.32% in the exergy efficiency was obtained at a volume fraction of 3% and a torsion ratio of 3, as the Re number goes from 60,000 to 18,000.

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A review of magnetic field influence on natural convection heat transfer performance of nanofluids in square cavities

Cited by 148 publications

References 237 publications

Effect of Straight, Inclined and Curved Fins on Natural Convection and Entropy Generation of a Nanofluid in a Square Cavity Influenced by a Magnetic Field

Effect of Straight, Inclined and Curved Fins on Natural Convection and Entropy Generation of a Nanofluid in a Square Cavity Influenced by a Magnetic Field

Mathematical Modelling of MHD Natural Convection in a Linearly Heated Porous Cavity

The Influence of Combined Turbulators on the Hydraulic-Thermal Performance and Exergy Efficiency of MWCNT-Cu/Water Nanofluid in a Parabolic Solar Collector: A Numerical Approach

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