A magnetic vortex generator for simultaneous heat transfer enhancement and pressure drop reduction in a mini channel

Bezaatpour, Mojtaba; Goharkhah, Mohammad

doi:10.1002/htj.21658

Cited by 19 publications

(4 citation statements)

References 45 publications

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“…The present study is also validated with the numerical and experimental investigation completed by Bezaatpour et al [16] and Ashjaee et al [48] for the heating channel with two magnet sources at the front, i.e., 7.5 mm and 15 mm. The results obtained are within the error 5% limits as compared to the validated work.…”

Section: Grid Independence Test and Validationsupporting

confidence: 65%

“…It is important to take the properties of the nanofluid as a function of temperature and nanoparticle concentration. Assuming that the concentration of the nanoparticles is uniform throughout the domain, the effective physical properties of the nanofluid can be calculated as follows [16,45,46]:…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…The Nusselt Number (Nu) represents the ratio of convective to conductive heat transfer at a boundary in fluid [16]. It is given by:…”

Section: Thermo-hydraulic Parametersmentioning

confidence: 99%

“…The magnetic forces were utilized to place colloids at a specific region of the devices, using magnetic nanofluids as an advanced functional material. The magnetic nanoparticles utilized in the magnetic nanofluids are typically constructed of metals (ferromagnetic materials) such as iron, cobalt, and nickel, as well as their oxides (ferrimagnetic materials) such as magnetite (Fe 3 O 4 ), spinel-type ferrites, and so on [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Magnetic Baffles and Magnetic Nanofluid on Thermo-Hydraulic Characteristics of Dimple Mini Channel for Thermal Energy Applications

et al. 2022

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The combined effect of a magnetic baffle and a dimple turbulator on the heat transfer and pressure drop is investigated computationally in a mini channel. Fe3O4 magnetic nanofluid is used as a working fluid. The Reynolds number (Re) is varied from 150 to 210 and the magnetic field intensities range from 1200 G to 2000 G. Finite-volume based commercial computational fluid dynamics (CFD) solver ANSYS-Fluent 18.1 was used for the numerical simulations. A laminar viscous model is used with pressure-velocity coupling along with second-order upwind discretization and QUICK scheme for discretizing the momentum and energy equations. The results show that there is an increase of 3.53%, 10.77%, and 25.39% in the Nusselt numbers when the magnetic fields of 1200 G, 1500 G and 2000 G, respectively, are applied at x = 15 mm, as compared to the flow without a magnetic field when the pitch = 10 mm. These values change to 1.51%, 6.14% and 18.47% for a pitch = 5 mm and 0.85%, 4.33%, and 15.25% for a pitch = 2.5 mm, when compared to the flow without a magnetic field in the respective geometries. When the two sources are placed at x = 7.5 mm and 15 mm, there is an increase of 4.52%, 13.93%, and 33.08% in the Nusselt numbers when magnetic fields of 1200 G, 1500 G, and 2000 G are applied when the pitch = 10 mm. The increment changed to 1.82%, 8.16%, and 22.31% for a pitch = 5 mm and 1.01%, 5.96%, and 21.38% for a pitch = 2.5 mm. This clearly shows that the two sources at the front have a higher increment in the Nusselt numbers compared to one source, due to higher turbulence. In addition, there is a decrease in the pressure drop of 10.82%, 16.778%, and 26.75% when magnetic fields of 1200 G, 1500 G, and 2000 G, respectively, are applied at x = 15 mm, as compared to flow without magnetic field when the pitch = 10 mm. These values change to 2.46%, 4.98%, and 8.54% for a pitch = 5 mm and 1.62%, 3.52%, and 4.78% for a pitch = 2.5 mm, when compared to flow without magnetic field in the respective geometries. When two sources are placed at x = 7.5 mm and 15 mm, there is an decrease of 19.02%, 31.3%, and 50.34% in the pressure drop when the magnetic fields of 1200 G, 1500 G and 2000 G are applied when the pitch = 10 mm. These values change to 4.18%, 9.52%, and 16.52% for a pitch = 5 mm and 3.08%, 6.88%, and 14.88% for a pitch = 2.5 mm. Hence, with the increase in the magnetic field, there is a decrease in pressure drop for both the cases and the pitches. This trend is valid only at lower magnetic field strength, because the decrease in the pressure drop dominates over the increase in pressure drop due to turbulence.

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Section: Grid Independence Test and Validationsupporting

confidence: 65%

Section: Boundary Conditionsmentioning

confidence: 99%

“…The Nusselt Number (Nu) represents the ratio of convective to conductive heat transfer at a boundary in fluid [16]. It is given by:…”

Section: Thermo-hydraulic Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Magnetic Baffles and Magnetic Nanofluid on Thermo-Hydraulic Characteristics of Dimple Mini Channel for Thermal Energy Applications

et al. 2022

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Employing nonuniform magnetic fields to improve energy transfer of flow after a sudden expansion inside a miniature channel: A hydrothermal study

Bahrami,

Ghaedi,

Attarzadeh

2024

Engineering Reports

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This study aims to use single/multiple dipoles to control the flow field after a two‐dimensional milli channel, including a sudden expansion. The study is done numerically and using a finite volume based software. First, a single dipole is positioned under the lower boundary of the channel located after the step (which is heated), and the influences of the different locations of the dipole under the heat transfer and pressure drop are analyzed. The same analysis is done for a dipole located on the opposite wall. The results show that the best performance is achieved when the dipole is located under the heated wall, where it enhances local heat transfer by 700%. The study also reveals that when multiple dipoles are used in the domain, some enhancement happens in the local Nusselt number, but the resulting pressure loss is so high. For example, when three dipoles are used, the local heat transfer enhances by 15% in specific places, but the pressure drop increases by five times. The higher strength of the dipoles also results in a much higher pressure drop. Also, the study of the inlet flow Reynolds number shows that magnetic effects on the flow decrease as the Reynolds number rises.

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Computational Investigation on Flow Dynamics and Heat Transfer of Nanofluid in Low Reynolds Number Under Magnetic Field

Sharma¹,

Vishwakarma²,

Mukherjee³

et al. 2023

Lecture Notes in Mechanical Engineering

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A magnetic vortex generator for simultaneous heat transfer enhancement and pressure drop reduction in a mini channel

Cited by 19 publications

References 45 publications

Effect of Magnetic Baffles and Magnetic Nanofluid on Thermo-Hydraulic Characteristics of Dimple Mini Channel for Thermal Energy Applications

Effect of Magnetic Baffles and Magnetic Nanofluid on Thermo-Hydraulic Characteristics of Dimple Mini Channel for Thermal Energy Applications

Employing nonuniform magnetic fields to improve energy transfer of flow after a sudden expansion inside a miniature channel: A hydrothermal study

Computational Investigation on Flow Dynamics and Heat Transfer of Nanofluid in Low Reynolds Number Under Magnetic Field

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