Analysis of temperature-sensitive magnetic fluids in a porous square cavity depending on different porosity and Darcy number

Jin, Licong; Zhang, Xinrong

doi:10.1016/j.applthermaleng.2012.05.016

Cited by 14 publications

(16 citation statements)

References 20 publications

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“…We can observe that two convective vortexes occur between the bottom wall and the upper wall because of the magnetic force of thermosensitive MF. In the calculated region, the temperature shows a nonuniform distribution, which is attributed to the mutual constraints between the magnetic force and the gravity (detailed interpretation could be found in previous studies). The average Nusselt number is also investigated in Jin et al; it displays that the thermal convection of MF is enhanced in the TES, with high heat‐transfer efficiency between the TES system and heat source.…”

Section: Methodssupporting

confidence: 53%

“…It is affected by temperature and external magnetic field. From previous studies, the magnetic thermal convection is enhanced under the external magnetic field, and the heat transfer is also enhanced then.…”

Section: Methodsmentioning

confidence: 82%

“…They have investigated the flow and heat transfer at different magnetic Rayleigh numbers and have found that heat transfer is enhanced with the strength of the external magnetic field. Furthermore, a numerical simulation in a porous square cavity has been investigated, in details, by lattice Boltzmann method . Both effective gravity and magnetic force were analyzed as the driving force to affect the heat transfer.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, a numerical simulation in a porous square cavity has been investigated, in details, by lattice Boltzmann method. 33,34 Both effective gravity and magnetic force were analyzed as the driving force to affect the heat transfer. It is observed that the heat transfer, which is enhanced because of the thermal convection driven by a magnetic force, is more intensive than that driven by gravity.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of a new thermal energy storage system using thermo-sensitive magnetic fluid and porous medium

Jin

Zhang

2019

Int J Energy Res

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Summary In this paper, a novel thermal energy storage (TES) system based on a thermo‐sensitive magnetic fluid (MF) in a porous medium is proposed to store low‐temperature thermal energy. In order to have a better understanding about the fluid flow and heat‐transfer mechanism in the TES system, four different configurations, using ferrofluid as the basic fluid and either copper foam or porous carbon with different porosity (90 and 100 PPI, respectively) as the packed bed, are investigated experimentally. Furthermore, two thermal performance parameters are evaluated during the heat charging cycle, which are thermal storage velocity and thermal storage capacity of the materials under a range of magnetic field strength. It is shown that heat conduction is the primary heat‐transfer mechanism in copper foam TES system, while magnetic thermal convection of the magnetic fluid is the dominating heat‐transfer mechanism in the porous carbon TES. In practical applications in small‐scale systems, the 90‐PPI copper foam should be selected among the four porous materials because of its cost efficiency, while porous carbon should be used in industrial scale systems because of its sensitivity to magnetic field and cost efficiency.

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Section: Methodssupporting

confidence: 53%

Section: Methodsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of a new thermal energy storage system using thermo-sensitive magnetic fluid and porous medium

Jin

Zhang

2019

Int J Energy Res

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“…Moreover, flows under external magnetic field are of practical interest such as crystal growth in liquids, cooling of nuclear reactors, electronic packages, micro electronic devices; and have been the subject of many earlier and recent studies for free fluid flows [4][5][6]. Furthermore, the study of flow and heat transfer in electrically conducting fluid has received considerable attention and renewed interest due to the many applications in engineering problems.…”

Section: Introductionmentioning

confidence: 99%

Conjugate Effects of Buoyancy and Magnetic Field on Heat and Fluid Flow Pattern at Low-to-Moderate Prandtl Numbers

Djebali

Abbassi

Rouahi

2016

ILCPA

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This study aims to present a numerical investigation of unsteady two-dimensional natural convection of an electrically conducting fluid in a square medium under externally imposed magnetic field. A temperature gradient is applied between the two opposing side walls parallel to ydirection, while the floor and ceiling parallel to x-direction are kept adiabatic. The coupled momentum and energy equations associated with the Lorentz 'decelerating' force as well as the buoyancy force terms are solved using the single relaxation lattice Boltzmann (LB) approach. The flow is characterized by the Rayleigh number Ra (10 3 -10 6 ), the Prandtl number Pr (0.01-10), the Hartman number Ha (0-100) determined by the strength of the imposed magnetic field and its tilt angle from x-axis ranging from 0° to 90°. The changes in the buoyant flow patterns and temperature contours due to the effects of varying the controlling parameters and associated heat transfer are examined. It was found that the developed thermal LB model gives excellent results by comparison with former experimental and numerical findings. Starting from the values 10 5 of the Rayleigh number Ra and Ha=0, the flow is unsteady multicellular for low Prandtl number typical of liquid metal. Increasing gradually Pr, the flow undergoes transition to steady bicellular. The transition occurs at a threshold value between Pr=0.01 and 0.1. Increasing more the Prandtl number, the flow structure is distorted due to the viscous forces which outweigh the buoyancy forces and a thermal stratification is clearly established. For high Hartman number, the damping effects suppress the unsteady behaviour and results in steady state with extended unicellular pattern in the direction of Lorentz force and the heat transfer rate is reduced considerably.

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Internal Natural Convection: Heating from the Side

Nield¹,

Bejan²

2017

Convection in Porous Media

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Analysis of temperature-sensitive magnetic fluids in a porous square cavity depending on different porosity and Darcy number

Cited by 14 publications

References 20 publications

Experimental investigation of a new thermal energy storage system using thermo-sensitive magnetic fluid and porous medium

Experimental investigation of a new thermal energy storage system using thermo-sensitive magnetic fluid and porous medium

Conjugate Effects of Buoyancy and Magnetic Field on Heat and Fluid Flow Pattern at Low-to-Moderate Prandtl Numbers

Internal Natural Convection: Heating from the Side

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