Natural Convection in an Enclosure with a Partially Active Magnetic Field

Jalil, Jalal M.; Al-Tae'y, Kays A.; Ismail, Sammar J.

doi:10.1080/10407782.2013.772861

Cited by 17 publications

(10 citation statements)

References 14 publications

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“…Experimental and numerical studies have been conducted to investigate the effects of magnetic field on heat transfer [14][15][16][17][18][19][20][21][22][23]. A review of heat transfer enhancement using ferrofluids is given in ref.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study and POD-Based Prediction of Natural Convection in a Ferrofluids–Filled Triangular Cavity with Generalized Neural Networks

Selimefendigil

Öztop

2015

Numerical Heat Transfer, Part A: Applications

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The effects of a magnetic dipole source on the natural convection of ferrofluids in a triangular cavity are studied. A partial heater is added to the left vertical wall of the cavity while the right vertical wall is kept at the constant temperature. A magnetic dipole source is placed outside the cavity close to the heater. The governing equations of a coupled multi-physics system are solved with a commercial solver using the finite element method. Computations are performed for different ranges of parameters: Rayleigh number (10 4 Ra 10 6 ), strength of the magnetic dipole (0 c 8), horizontal and vertical location of the magnetic dipole (À2.5H a À0.5H, 0.2H b 0.8H). It is observed that the interaction between natural convection and ferrofluid convection under the influence of magnetic dipole affects the flow and thermal field in such the triangular enclosure. The external magnetic field acts in such a way to decrease local heat transfer in some locations and increase it in others for certain combinations of flow parameters and therefore it can be used as a control parameter for fluid flow and heat transfer. Furthermore, an interpolation method based on Proper Orthogonal Decomposition and Generalized Neural Networks is proposed to predict the thermal performance of the system. This approach gives satisfactory results in terms of local and averaged heat transfer values.

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Section: Introductionmentioning

confidence: 99%

Numerical Study and POD-Based Prediction of Natural Convection in a Ferrofluids–Filled Triangular Cavity with Generalized Neural Networks

Selimefendigil

Öztop

2015

Numerical Heat Transfer, Part A: Applications

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“…The study reveals that by adjusting the applied magnetic fields thermo-fluid flow damped and behavior changes from chaotic oscillation to a steady situation. Very recently, Geridonmez and Oztop 16,24 and Jalil et al , 25 deliberated the thermo-magnetic convection of left heated and right cooled air-filled cavity 16 and without a porous medium 24 under the influence of partially active horizontal and diagonally inclined partial magnetic fields. It is found that the transport process in the cavity is altered depending upon the position, location, and intensity of the imposed magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

“…Several researchers have examined the MHD thermal convection in different flow geometries under various multi-physical considerations like differentially heated cavity applying uniform magnetic fields over the whole domain, 19 nonuniform magnetic fields using line dipoles, 20 permanent magnets, 21,22 alternating magnetic fields, 8 periodic magnetic fields, 23 and partially applied magnetic fields. 16,[24][25][26] From these reported studies, it is observed that the thermal-fluid phenomena in a confined space relating to any thermal device can effectively be controlled by applying magnetic fields with proper adjustment. On this background, the researcher 25 examined the MHD convection of fluid having a lesser Prandtl number (Pr = 0.024) in a cavity heated differentially and subjected to partially active nonuniform magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

“…16,[24][25][26] From these reported studies, it is observed that the thermal-fluid phenomena in a confined space relating to any thermal device can effectively be controlled by applying magnetic fields with proper adjustment. On this background, the researcher 25 examined the MHD convection of fluid having a lesser Prandtl number (Pr = 0.024) in a cavity heated differentially and subjected to partially active nonuniform magnetic fields. The study reveals that by adjusting the applied magnetic fields thermofluid flow damped and behavior changes from chaotic oscillation to a steady situation.…”

Section: Introductionmentioning

confidence: 99%

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Implementation of partial magnetic fields to magneto-thermal convective systems operated using hybrid-nanoliquid and porous media

Biswas

Mondal

Manna

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Application of partial magnetic field can be useful for controlling thermal convective processes occurring in magneto-thermal devices/systems. The present work aims to demonstrate the implementation of a partial magnetic field using a typical thermal system. This study explores both local transport phenomena and global heat transfer rates. The partial magnetic fields involving multiphysical conditions find many applications in electronic industries, medical, and health science. The paper presents a conceptual finding from the use of a partial magnetic field on a classical porous cavity comprising Cu−Al2O3/water hybrid nanoliquid heated differentially. The partial magnetic field is functional either horizontally or vertically. The finite volume technique is employed to the coupled transport equations subjected to particular boundary situations using a developed computing code. The simulations are accomplished to a great extent with different variables such as the Darcy-Rayleigh number (Ram), Darcy number (Da), Hartmann number (Ha), and hybrid nanoparticles concentrations ( φ). The effects of magnetic field widths and their positional variations in horizontal and vertical directions are also analyzed. The study found that the convective transport process could effectively be modulated by setting the appropriate position, widths, directions, and intensity of the imposed magnetic fields. The partial magnetic field causes a decrease in heat transfer ∼17.15% or 9.71% less compared to the whole length horizontal or vertical magnetic field. The application of partial magnetic fields significantly alters local thermo-fluid flow phenomena and advancement in heat transfer characteristics in comparison to the magnetic fields acting over the entire domain. Furthermore, the heatline visualization tools reveal the insight of the heat flow dynamics, which dictates the selection of appropriate parametric values and magnetic field configurations.

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“…Jalil et al. 13 studied natural convection in the cavity with the partial magnetic field at internal Ra = 10 7 and external Ra = 10 5 at Pr = 0.024. For a given Ha, chaotic fluid flow tends to become periodic one at particular amplitude and frequency; while high magnetic field strength, the flow in the cavity tend to become steady laminar with stable average Nusselt number values.…”

Section: Introductionmentioning

confidence: 99%

Computational analysis of magneto-hydrodynamic natural convection in partially differentially heated cavity: Effect of cooler size

Gangawane

Bharti

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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This work presents thermal lattice Boltzmann method simulation of magneto-hydrodynamic, buoyancy-driven convection in a partially differentially heated cavity (aspect ratio = 1) subjected to a magnetic field along the vertical direction, i.e. at 90°. Lattice Boltzmann method simulations are performed for three different cooler lengths (Lc = H/4, H/2, H) placed along the middle of one vertical wall for a wide range of Rayleigh and Hartmann numbers (103 ≤ Ra ≤ 105; Ha = 0, 60, 120) at fixed Prandtl number (Pr = 0.71, air). A partial heater is placed at the center of other vertical walls and its size is kept as half of the characteristic length (H/2). The physical insights of the systems are delineated by systematic analysis of stream function and temperature contours. Heat transfer characteristics of the cavity are elucidated by using averaged values of the Nusselt number. It is noted that average Nusselt number has a proportional dependence with cooler length and Rayleigh number, while it varied inversely with Hartmann number. Further, the functional dependence of average Nusselt number with cooler size, Rayleigh number, and Hartmann number is established for possible use in engineering design purpose.

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Natural Convection in an Enclosure with a Partially Active Magnetic Field

Cited by 17 publications

References 14 publications

Numerical Study and POD-Based Prediction of Natural Convection in a Ferrofluids–Filled Triangular Cavity with Generalized Neural Networks

Numerical Study and POD-Based Prediction of Natural Convection in a Ferrofluids–Filled Triangular Cavity with Generalized Neural Networks

Implementation of partial magnetic fields to magneto-thermal convective systems operated using hybrid-nanoliquid and porous media

Computational analysis of magneto-hydrodynamic natural convection in partially differentially heated cavity: Effect of cooler size

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