Magnetic field effect on natural convection in a nanofluid-filled square enclosure

Ghasemi, Behzad; Aminossadati, Saiied M.; Raisi, Afrasiab

doi:10.1016/j.ijthermalsci.2011.04.010

Cited by 534 publications

(249 citation statements)

References 27 publications

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“…coaxial cylinders [9], thermosiphons [10], porous media [11]. Nowadays, a new field in the area is connected with nanofluids and analysing aspects like a concentration of nanoparticles or their sizes, and their influence on heat transfer in magnetic field [12][13][14]. Despite the considerable number of articles about the influence of different factors on natural convection, in 2012 Turan et al [15] published research concerning laminar convection in systems with different aspect ratios (AR = height/width).…”

Section: Introductionmentioning

confidence: 99%

High magnetic field impact on the natural convection behaviour of a magnetic fluid

2017

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An experimental analysis of high magnetic field impact on the natural convection of a paramagnetic fluid was conducted. Two geometries of experimental enclosures were investigated: Enclosure no. 1 with an aspect ratio of 0.5 (AR aspect ratio = height/width) and Enclosure no. 2 with a higher aspect ratio equal to 2.0. Various magnetic field inductions were analysed and representative parts of the obtained results are shown in the present paper. Estimations of the Nusselt number and spectral analysis of the fluid's behaviour were performed. The obtained results led to the conclusion that magnetic field has an immense impact on paramagnetic fluid flow, on heat transferred by the flow, as well as the flow structure. Introducing an additional buoyancy force to the system, acting toward intensification of the fluid motion, causes significant enhancement of the Nusselt number in both geometries. Additionally, a spectral analysis of temperature changes indicates that large flow structures occurring in natural convection cases at low frequencies, under the influence of magnetic field, transform towards smaller structures in the whole frequency band.

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Section: Introductionmentioning

confidence: 99%

High magnetic field impact on the natural convection behaviour of a magnetic fluid

2017

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“…Different nano sized particles such as Al 2 O 3 , Cu, CuO, SO 2 , TiO 2 are added in the base fluid to enhance the thermal characteristics of the base flow [22][23][24][25][26][27][28][29]. Magnetohydrodynamics studies with added nanoparticles to the base fluids were received attention during recent years in various heat transfer applications [30][31][32][33][34]. Ghasemi et al [31] investigated the MHD free convection in a cavity filled with H 2 O-Al 2 O 3 nanofluid.…”

Section: Introductionmentioning

confidence: 99%

Natural Convection and Entropy Generation in Nanofluid Filled Entrapped Trapezoidal Cavities under the Influence of Magnetic Field

Selimefendigil

Öztop

Abu‐Hamdeh

2016

Entropy

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Abstract:In this article, entropy generation due to natural convection in entrapped trapezoidal cavities filled with nanofluid under the influence of magnetic field was numerically investigated. The upper (lower) enclosure is filled with CuO-water (Al 2 O 3 -water) nanofluid. The top and bottom horizontal walls of the trapezoidal enclosures are maintained at constant hot temperature while other inclined walls of the enclosures are at constant cold temperature. Different combinations of Hartmann numbers are imposed on the upper and lower trapezoidal cavities. Numerical simulations are conducted for different values of Rayleigh numbers, Hartmann number and solid volume fraction of the nanofluid by using the finite element method. In the upper and lower trapezoidal cavities magnetic fields with different combinations of Hartmann numbers are imposed. It is observed that the averaged heat transfer reduction with magnetic field is more pronounced at the highest value of the Rayleigh number. When there is no magnetic field in the lower cavity, the averaged Nusselt number enhances as the value of the Hartmann number of the upper cavity increases. The heat transfer enhancement rates with nanofluids which are in the range of 10% and 12% are not affected by the presence of the magnetic field. Second law analysis of the system for various values of Hartmann number and nanoparticle volume fractions of upper and lower trapezoidal domains is performed.

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“…Convective heat transfer in the presence of magnetic field comes to be a research focus nowadays because of its wide reach in engineering practices, and applying magnetic field to strengthen or control heat transfer properties in the cavity gains its popularity among a large quantity of researchers.Investigators have already proved that the Rayleigh number has a positive effect on the heat transfer while the Hartmann number has a negative one [1][2][3][4]. Published literature [1][2][3][4][5][6][7][8][9][10] are based on the traditional Computational Fluid Dynamics methods such as the finite volume method, the finite difference method and so on, while the lattice Boltzmann method has already become an available and brand new numerical method after the theoretical breakthrough and research progress for more than 20 years.…”

Section: Introductionmentioning

confidence: 99%

“…Published literature [1][2][3][4][5][6][7][8][9][10] are based on the traditional Computational Fluid Dynamics methods such as the finite volume method, the finite difference method and so on, while the lattice Boltzmann method has already become an available and brand new numerical method after the theoretical breakthrough and research progress for more than 20 years. LBM is a programming easily numerical method with simple algorithms which also has capabilities of simulation for microflows, nanopaticles, crystal growth, porous media and many other complex convective heat transfer problems which traditional methods cannot achieve.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of thermomagnetic convection of electrically conducting fluids under an inclined magnetic field using lattice Boltzmann method

Xie¹,

Jiang²,

He³

et al. 2015

Proceedings of the 2015 International Power, Electronics and Materials Engineering Conference

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Abstract:In the present work, natural convection in a square cavity filled with an electrically conducting fluid has been numerically investigated in the presence of an inclined magnetic field using lattice Boltzmann method. The vertical walls of this two-dimensional cavity are heated differentially while the horizontal walls are assumed to be adiabatic. The flow and temperature field distributions are obtained and the average Nusselt numbers on the left hot wall is calculated. Available results reveal that both the Hartmann number and the inclination angles of magnetic field have significant influence on the heat transfer.

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Magnetic field effect on natural convection in a nanofluid-filled square enclosure

Cited by 534 publications

References 27 publications

High magnetic field impact on the natural convection behaviour of a magnetic fluid

High magnetic field impact on the natural convection behaviour of a magnetic fluid

Natural Convection and Entropy Generation in Nanofluid Filled Entrapped Trapezoidal Cavities under the Influence of Magnetic Field

Numerical investigation of thermomagnetic convection of electrically conducting fluids under an inclined magnetic field using lattice Boltzmann method

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