Convective MHD flow of hybrid-nanofluid within an elliptic porous enclosure

Shehzad, S. A.; Sheikholeslami, M.; Ambreen, Tehmina; Shafee, Ahmad

doi:10.1016/j.physleta.2020.126727

Cited by 35 publications

(16 citation statements)

References 24 publications

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“…Impacts of various effects such as thermal radiation and viscous dissipation are ignored. The Eckert number is much less than 1 in this work, and many studies have been conducted that ignored the viscous dissipation in the energy equation for nanofluid convection with MF effects. − The magnetic Re number is considered to be small when the induced MF impacts are small and displacement currents effects are ignored. Important applications, significance, and impacts of displacement currents have been mentioned in a recent work in ref .…”

Section: Mathematical Modelingmentioning

confidence: 99%

Control of Magnetohydrodynamic Mixed Convection and Entropy Generation in a Porous Cavity by Using Double Rotating Cylinders and Curved Partition

et al. 2021

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In this work, mixed convection and entropy generation analyses in a partitioned porous cavity with double inner rotating cylinders are explored under magnetic field effects. A curved partition shape is considered with identical rotating cylinders and an inclined magnetic field, while the right vertical wall moves with a constant speed in the y -direction. Numerical simulations are performed by considering various values of Rayleigh number, Hartman number, Darcy number, inclination of the magnetic field, size of the curved partitions, and rotational speeds of the inner cylinders and their vertical locations with the cavity. Complicated flow field with multicellular structures are observed due to the complex interaction between the natural convection, moving wall, and rotational effects of inner cylinders. Improved heat-transfer performance is obtained with higher values of magnetic field inclination, higher values of permeability/porosity of the medium, and higher rotational speeds of the cylinders. Almost doubling of the average Nu number is obtained by decreasing the value of the Hartmann number from 25 to 0 or varying the magnetic field inclination from 90 to 0. When rotational effects of the cylinders are considered, average heat-transfer improvements by a factor of 5 and 5.9 are obtained for nondimensional rotational speeds of 5 and −5 in comparison with the case of motionless cylinders. An optimum length of the porous layer is achieved for which the best heat-transfer performance is achieved. As the curvature size of the partition is increased, better heat transfer of the hot wall is obtained and up to 138% enhancement is achieved. Significant increments of entropy generation are observed for left and right domains including the rotating cylinders. The magnetic field parameter also affects the entropy generation and contributions of different domains including the curved porous partition.

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Section: Mathematical Modelingmentioning

confidence: 99%

Control of Magnetohydrodynamic Mixed Convection and Entropy Generation in a Porous Cavity by Using Double Rotating Cylinders and Curved Partition

et al. 2021

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“…Coupled effects of using nanofluids and MaF in porous media applications can be found in Refs. [ 77 , 78 , 79 , 80 , 81 , 82 ].…”

Section: Introductionmentioning

confidence: 99%

Coupled Effects of Using Magnetic Field, Rotation and Wavy Porous Layer on the Forced Convection of Hybrid Nanoliquid Flow over 3D-Backward Facing Step

et al. 2022

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In the present study, the effects of using a corrugated porous layer on the forced convection of a hybrid nanofluid flow over a 3D backward facing step are analyzed under the coupled effects of magnetic field and surface rotation. The thermal analysis is conducted for different values of the Reynolds number (Re between 100 and 500), the rotational Reynolds number (Rew between 0 and 2000), the Hartmann number (Ha between 0 and 15), the permeability of the porous layer (the Darcy number, Da between 10−5 and 10−2) and the amplitude (ax between 0.01 ap and 0.7 ap) and wave number (N between 1 and 16) of the porous layer corrugation. When rotations are activated, the average Nusselt number (Nu) and pressure coefficient values rise, while the increment of the latter is less. The increment in the average Nu is higher for the case with a higher permeability of the layer. When the corrugation amplitude and wave number are increased, favorable impacts of the average Nu are observed, but at the same time pressure coefficients are increased. Successful thermal performance estimations are made by using a neural-based modeling approach with a four input-two output system.

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“…Researchers have been attracted to hydromagnetic natural convective flow with heat transport over a stretching surface because of its numerous applications in MHD generators, metallic plate cooling, geothermal energy extraction, crystal growth, controlled thermonuclear reactors, oil recovery techniques, boundary layer control, and other fields. Motivated by these applications, Shehzad et al [6] scrutinized free convective magneto-hybrid nanofluid flow within a porous enclosure. Patil and Kulkarni [7] examined the hydromagnetic hybrid nanofluid flow past a slender cylinder with mixed convection impact.…”

Section: Introductionmentioning

confidence: 99%

“…Motivated by these applications, Shehzad et al. [6] scrutinized free convective magneto‐hybrid nanofluid flow within a porous enclosure. Patil and Kulkarni [7] examined the hydromagnetic hybrid nanofluid flow past a slender cylinder with mixed convection impact.…”

Section: Introductionmentioning

confidence: 99%

Featuring the Hall effect and variable thermal conductivity on magnetized hybrid nanoliquid flow for three distinct shapes of nanoparticles: A comparative study

2022

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The purpose of this work is to capture the circumstances of variable thermal conductivity and the Hall effect on the three-dimensional rotating flow of hybrid nanofluid towards a bidirectional stretching sheet. The hybrid nanofluid is made by suspending nanometer-sized copper (Cu) and alumina (Al 2 O 3 ) nanoparticles in the base liquid water (H 2 O). The sheet is immersed in a Darcy porous medium. The flow is induced by both stretching of the sheet and thermal buoyancy force due to free convection. Further, nonlinear thermal radiation, frictional and Joule heating are prevalent in the temperature field. The surface boundary also imposes two constraints, namely velocity slip and convective heating. Another aspect of this analysis is to examine the impact of different shapes of copper and alumina nanoparticles on temperature distribution. For that, three variants, namely, spherical, blade, and lamina of nanoparticles shape, are considered. The resulting nonlinear differential equations are tackled by using Runge-Kutta-Fehlberg and secant methods-based shooting technique. A detailed discussion on the physical impacts of various relevant parameters over velocity, temperature, local skin friction coefficients and Nusselt number is carried out with the help of graphs. Primary and secondary velocities of the hybrid nanofluid are accelerated for growing values of Hall current parameter, whereas the reverse trend is noticed w.r.t. velocity slip and suction parameters. Moreover, the hybrid nanofluid temperature profile has a direct relation with viscous dissipation and thermal radiation parameters. This research may have important applications in high-and low-temperature operations, paints, space technologies, medications, cosmetics, conductive coatings, and so forth.

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Convective MHD flow of hybrid-nanofluid within an elliptic porous enclosure

Cited by 35 publications

References 24 publications

Control of Magnetohydrodynamic Mixed Convection and Entropy Generation in a Porous Cavity by Using Double Rotating Cylinders and Curved Partition

Control of Magnetohydrodynamic Mixed Convection and Entropy Generation in a Porous Cavity by Using Double Rotating Cylinders and Curved Partition

Coupled Effects of Using Magnetic Field, Rotation and Wavy Porous Layer on the Forced Convection of Hybrid Nanoliquid Flow over 3D-Backward Facing Step

Featuring the Hall effect and variable thermal conductivity on magnetized hybrid nanoliquid flow for three distinct shapes of nanoparticles: A comparative study

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