Effect of magnetic field on heat transfer in rectangular duct flow of a magnetic fluid

Motozawa, Masaaki; Jia, Chenglong; Sawada, Tatsuo; Kawaguchi, Yasuo

doi:10.1016/j.phpro.2010.11.043

Cited by 66 publications

(13 citation statements)

References 8 publications

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“…The increase of the pressure drop is also reported as the side effect. Motozawa et al reported a 20% improvement in heat transfer coefficient in a rectangular duct by applying an external magnetic field of an electromagnet. Goharkhah et al obtained 18.9% and 31.4% heat transfer enhancement for a water‐based magnetite (Fe 3 O 4 ) ferrofluid flow in a heated tube by application of constant and alternating magnetic field, respectively.…”

Section: Introductionmentioning

confidence: 99%

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

Bezaatpour

Goharkhah

2020

Heat Trans

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An active vortex generator is proposed for heat transfer enhancement in heat sinks and heat exchangers and removal of highly concentrated heat fluxes. It is based on applying a uniform magnetic field of permanent magnets to a magnetic fluid (ferrofluid) flowing in a heated channel.Numerical simulations are carried out for a 2 Vol% ferrofluid at different Reynolds numbers (150-210) and magnetic field intensities (0-1400 G) to investigate the possibility of simultaneous heat transfer enhancement and pressure drop reduction by the proposed method. Comparisons are also made with the other conventional vortex generators. Results indicate that the external magnetic field acts as a vortex generator that changes the velocity distribution, improves the flow mixing, and thereby increases the convective heat transfer. Surprisingly, the heat transfer enhancement is accompanied by a decrease of the friction coefficient due to the flow separation and decrease of the flow contact with the surface. It is also concluded that increasing the magnetic field intensity, decreasing the flow rate, and adding a second identical magnetic vortex generator have favorable effects on both pressure drop and heat transfer. A maximum of 37.8% enhancement of heat transfer with a 29.18% reduction of pressure drop has been achieved at the optimum condition. K E Y W O R D S flow mixing, forced convection, heat transfer, magnetic field effect, magnetite ferrofluid, vortex generator

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Section: Introductionmentioning

confidence: 99%

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

Bezaatpour

Goharkhah

2020

Heat Trans

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“…Furthermore, a number of studies have concerned the forced convection heat transfer of the ferrofluids in the absence and presence of an external magnetic field [15][16][17][18][19]. Sundar et al [15] studied turbulent forced convection heat transfer and friction factor of Fe 3 O 4 magnetic nanofluid in a tube in the absence of magnetic field and obtained correlations for estimation of the Nusselt number and friction factor.…”

Section: Introductionmentioning

confidence: 99%

“…Their results show that the heat transfer coefficient is enhanced by 30.96% and friction factor by 10.01% at 0.6% volume fraction compared to the base fluid. Motozawa et al [16] studied the effect of magnetic field on heat transfer of waterbased magnetic fluid named W-40 in a rectangular duct. It is shown that heat transfer coefficient increases locally in the region where magnetic field exists and has a direct relation with magnetic field intensity.…”

Section: Introductionmentioning

confidence: 99%

Convective heat transfer characteristics of magnetite nanofluid under the influence of constant and alternating magnetic field

et al. 2015

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“…They con-firmed the enhancement of the driving force by using the binary temperature-sensitive magnetic fluid. Regarding forced convective heat transfer, some researches [11,12] including our previous study [13] reported the heat transfer enhancement by applying external magnetic field in laminar flow regime. However, there is not enough knowledge about the reason for this enhancement.…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnetic Field Direction on Forced Convective Heat Transfer of Magnetic Fluid

Motozawa

Kino

Sawada

et al. 2015

Journal of the Japan Society of Applied Electromagnetics and Me

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Effect of magnetic field direction on forced convective heat transfer of magnetic fluid flow in a rectangular duct was investigated experimentally. Magnetic fields were applied to magnetic fluid flow in three directions, which were an axial direction, a parallel direction and a vertical direction against the heat transfer direction. Reynolds numbers based on hydraulic diameter and bulk mean velocity were set at about 980 for laminar flow and about 6700 for turbulent flow. In the case of laminar flow, heat transfer was enhanced in the vertical direction and slightly enhanced in the axial direction, but hardly changed in the parallel direction. In contrast, in the case of turbulent flow, heat transfer was suppressed in all directions. The suppression level in vertical and parallel direction is similar, but the suppression in axial direction is much weaker than those in other directions. Moreover, in order to discuss the heat transfer characteristics, the velocity distribution was also measured by an ultrasonic technique.

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Effect of magnetic field on heat transfer in rectangular duct flow of a magnetic fluid

Cited by 66 publications

References 8 publications

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

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

Convective heat transfer characteristics of magnetite nanofluid under the influence of constant and alternating magnetic field

Effect of Magnetic Field Direction on Forced Convective Heat Transfer of Magnetic Fluid

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