Experimental study on laminar pulsating flow and heat transfer of nanofluids in micro-fins tube with magnetic fields

Naphon, Paisarn; Wiriyasart, Songkran

doi:10.1016/j.ijheatmasstransfer.2017.10.131

Cited by 67 publications

(21 citation statements)

References 45 publications

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“…Pulsating flow has been used in diverse applications for convective heat transfer (HT) control. Theoretical [12], experimental [13,14] and numerical studies [15][16][17] have been performed to show the impacts of flow pulsation and its parameters of the fluid flow and HT characteristics. In a PCM-PB system, the velocity profile at the inlet can be made non-uniform and the wall region velocity can be varied by using a sequential velocity.…”

Section: Introductionmentioning

confidence: 99%

Combined Effects of Sequential Velocity and Variable Magnetic Field on the Phase Change Process in a 3D Cylinder Having a Conic-Shaped PCM-Packed Bed System

et al. 2021

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Effects of sequential velocity and variable magnetic field on the phase change during hybrid nanofluid convection through a 3D cylinder containing a phase-change material packed bed (PCM-PB) system is analyzed with the finite element method. As the heat transfer fluid, 40% ethylene glycol with hybrid TiO2-Al2O3 nanoparticles is considered. Impacts of the sequential velocity parameter (K, between 0.5 and 1.5), geometric factor of the conic-shaped PCM-PB (M, between 0.2 and 0.9), magnetic field strength (Ha number between 0 and 50) and solid volume fraction of hybrid nanoparticles (vol.% between 0.02% and 0.1%) on the phase change dynamics are explored. Effects of both constant and varying magnetic fields on the phase change process were considered. Due to the increased fluid velocity at the walls, the phase change becomes higher with higher values of the sequential velocity parameter (K). There is a 21.6% reduction in phase transition time (tF) between the smallest and highest values of K both in the absence and presence of a constant magnetic field. The value of tF is reduced with higher magnetic field strength and the amount of reduction depends upon the sequential velocity parameter. At K = 1.5, the reduction amount with the highest Ha number is 14.7%, while it is 26% at K = 0.5. When nanoparticle is loaded in the base fluid, the value of tF is further reduced. In the absence of a magnetic field, the amount of phase-transition time reduction is 6.9%, while at Ha = 50, it is 11.7%. The phase change process can be controlled with varying magnetic field parameters as well. As the wave number and amplitude of the varying magnetic field are considered, significant changes in the tF are observed.

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Section: Introductionmentioning

confidence: 99%

Combined Effects of Sequential Velocity and Variable Magnetic Field on the Phase Change Process in a 3D Cylinder Having a Conic-Shaped PCM-Packed Bed System

et al. 2021

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“…Mohebbi et al explored the MWCNT‐Fe 3 O 4 /water hybrid nanofluids in different channels (a ribbed channel, 37 a T‐shaped channel 38 ) by LBM, and analyzed the thermo‐hydraulic properties of the nanofluids under various working conditions. Naphon et al researched the nanofluids heat exchange enhancement mechanism in the micro‐channel heat sink 39 and micro‐fin tubes 40 by experimental research and numerical simulation, and made corresponding progress. Qi et al conducted detailed studies on the forced convection heat transfer of different nanofluids, such as SiO 2 ‐H 2 O nanofluids in the triangle tube, 41 water‐based TiO 2 nanofluids in double‐pipe heat exchangers, 42 in triangular tubes, 43 in CPU cooling system 44,45 and in different helical tubes, 46 Fe 3 O 4 ‐H 2 O magnetofluids in the circular tube under vertical magnetic field 47 .…”

Section: Introductionmentioning

confidence: 99%

Thermal and exergy efficiency of magnetohydrodynamic Fe₃O₄‐H₂O nanofluids flowing through a built‐in twisted turbulator corrugated tube under magnetic field

Fan

Tang

et al. 2020

Asia-Pacific J Chem Eng

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Experimental investigations were conducted to explore the thermal and exergy efficiency of Fe 3 O 4-H 2 O nanofluids in a corrugated tube. Some influences of the twisted turbulator, horizontal magnetic fields (B = 6mT, 12mT, and 18mT), particle mass fractions (ω = 0.1, 0.3, and 0.5 wt%) as well as Re numbers (800-12,000) were analyzed. The experimental results exhibited that the heat transfer capacity of nanofluids intensifies with the increment of mass fraction but weakens with the increase of magnetic flux density. For the same external conditions, the heat transfer capability of the corrugated tube with an inserted twisted turbulator is obviously stronger than that without the turbulator. The resistance coefficient can be augmented by the increasing mass fraction and horizontal magnetic field. In addition, the thermal efficiency R3 and the exergy efficiency were adopted to estimate the comprehensive performance of each working condition. It could be found that the increased mass fraction and reduced magnetic flux density cause an increasing trend on the thermal efficiency. Also, it was obtained that the exergy efficiency of working fluids is intensified under identical pumping power.

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“…Many investigations have been developed to assess the effect of magnetic field on heat transfer of nanofluids. Naphon and Wiriyasart [20] developed an experimental study on laminar pulsating flow and heat transfer of nanofluids in microfins tube with magnetic fields. The experiment conditions were: Reynolds number varied from 1000 to 2400; volume fractions of nanoparticles in the base fluid were 0.25% and 0.5%; the inlet temperature of nanofluid was 20℃.…”

Section: Introductionmentioning

confidence: 99%

The influence of magnetic field on heat transfer of magnetic nanofluid in a double pipe heat exchanger proposed in a small-scale CAES system

Malekan

Khosravi

Zhao

2019

Applied Thermal Engineering

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Globally, the integration of renewable energy (which has an intermittent nature) into the power system requires the system operators to improve the system performance to be able to effectively handle the variations of the power production in order to balance the supply and demand. This problem is seen as a major obstacle to the expansion of renewable energy if it is not handled in a suitable way. Efficient electricity storage technology is one of the feasible solutions. The current study proposes Fe3O4/water nanofluid under magnetic field as the secondary fluid in the proposed double pipe heat exchanger before the cavern. The heat of compressed air is absorbed by the secondary fluid and it is stored in an isolation tank. This stored fluid is used to warm up the air that leaves the cavern for expanding in the turbine. The results demonstrated that increasing the mass flow rate of secondary fluid decreases the cavern temperature. Also, the value of convective heat transfer of ferrofluid increases when the volume fraction of nanoparticle as well as magnetic field increases. Furthermore, increasing the volume fraction and magnetic field increases the pressure drop and friction factor of ferrofluid.

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Experimental study on laminar pulsating flow and heat transfer of nanofluids in micro-fins tube with magnetic fields

Cited by 67 publications

References 45 publications

Combined Effects of Sequential Velocity and Variable Magnetic Field on the Phase Change Process in a 3D Cylinder Having a Conic-Shaped PCM-Packed Bed System

Combined Effects of Sequential Velocity and Variable Magnetic Field on the Phase Change Process in a 3D Cylinder Having a Conic-Shaped PCM-Packed Bed System

Thermal and exergy efficiency of magnetohydrodynamic Fe₃O₄‐H₂O nanofluids flowing through a built‐in twisted turbulator corrugated tube under magnetic field

The influence of magnetic field on heat transfer of magnetic nanofluid in a double pipe heat exchanger proposed in a small-scale CAES system

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Experimental study on laminar pulsating flow and heat transfer of nanofluids in micro-fins tube with magnetic fields

Cited by 67 publications

References 45 publications

Combined Effects of Sequential Velocity and Variable Magnetic Field on the Phase Change Process in a 3D Cylinder Having a Conic-Shaped PCM-Packed Bed System

Combined Effects of Sequential Velocity and Variable Magnetic Field on the Phase Change Process in a 3D Cylinder Having a Conic-Shaped PCM-Packed Bed System

Thermal and exergy efficiency of magnetohydrodynamic Fe3O4‐H2O nanofluids flowing through a built‐in twisted turbulator corrugated tube under magnetic field

The influence of magnetic field on heat transfer of magnetic nanofluid in a double pipe heat exchanger proposed in a small-scale CAES system

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Thermal and exergy efficiency of magnetohydrodynamic Fe₃O₄‐H₂O nanofluids flowing through a built‐in twisted turbulator corrugated tube under magnetic field