Effect of magnetic field on natural convection in a nanofluid-filled semi-circular enclosure with heat flux source

Al-Zamily, Ali

doi:10.1016/j.compfluid.2014.07.013

Cited by 49 publications

(19 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fluid in the enclosure is a nanofluid (Cu-water). The assumptions that used here as follows [1]: the nanofluid are assumed to be Newtonian and incompressible. The flow is assumed to be laminar.…”

Section: Problem Description and Assumptionsmentioning

confidence: 99%

“…The problem of natural convection in enclosures has many engineering applications such as the cooling systems of electronic components, the building and thermal insulation systems, the built-in-storage solar collectors, the nuclear reactor systems, the food storage industry and the geophysical fluid mechanics [1]. Various techniques have been proposed to enhance the convection heat transfer performance of fluids inside the enclosure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Natural Convection and Entropy Generation in a Nanofluid-Filled Semi-Circular Enclosure with Heat Flux Source

Al-Zamily

Amin

2015

Procedia Engineering

View full text Add to dashboard Cite

The effect of presence of nanoparticles on natural convection and entropy generation in a semi-circular enclosure with present heat flux is investigated numerically in the present work. The enclosure is filled with nanofluids (Cu-water). The heat flux is supplied partly in the center of the base wall, and the other parts of base wall of the enclosure are assumed adiabatic. The center of the circular arc (-45°≤γ≤+45°) is assumed at constant cold temperature and the other parts of the circular arc are adiabatic. Finite element method based on the variational formulation is employed to solve momentum and energy as well as post-processing streamfunctions. The results are based on visualization of isotherms, streamfunction and entropy generation. Comparison with previously published work is performed and the results are found to be in a good agreement. The influence of pertinent parameters such as Rayleigh number (10 4 ≤Ra≤10 7 ) and solid volume fraction of nanoparticles (0≤Φ≤0.15 step 0.05) on the flow, temperature, and entropy generation are examined in the present paper. The results show that the heat transfer rate increases with an increase of the Rayleigh number and the nanoparticles volume fraction. The system irreversibility increases as nanoparticles fraction increase.

show abstract

Section: Problem Description and Assumptionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Natural Convection and Entropy Generation in a Nanofluid-Filled Semi-Circular Enclosure with Heat Flux Source

Al-Zamily

Amin

2015

Procedia Engineering

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…Kasaeipoor et al [39] studied the convection of Cu-Water nanofluid in a vented T-shaped cavity in the presence of an externally applied magnetic field. Al-Zamily [40] investigated numerically the effect of constant magnetic field on natural convection in a semi-circular enclosure filled with Cu-water nanofluid with the present of heat flux.…”

Section: Introductionmentioning

confidence: 99%

Entropy Generation and Natural Convection of CuO-Water Nanofluid in C-Shaped Cavity under Magnetic Field

Chamkha

Ismael

Kasaeipoor

et al. 2016

Entropy

134

View full text Add to dashboard Cite

This paper investigates the entropy generation and natural convection inside a C-shaped cavity filled with CuO-water nanofluid and subjected to a uniform magnetic field. The Brownian motion effect is considered in predicting the nanofluid properties. The governing equations are solved using the finite volume method with the SIMPLE (Semi-Implicit Method for Pressure Linked Equations) algorithm. The studied parameters are the Rayleigh number (1000 ď Ra ď 15,000), Hartman number (0 ď Ha ď 45), nanofluid volume fraction (0 ď φ ď 0.06), and the cavity aspect ratio (0.1 ď AR ď 0.7). The results have shown that the nanoparticles volume fraction enhances the natural convection but undesirably increases the entropy generation rate. It is also found that the applied magnetic field can suppress both the natural convection and the entropy generation rate, where for Ra = 1000 and φ = 0.04, the percentage reductions in total entropy generation decreases from 96.27% to 48.17% for Ha = 45 compared to zero magnetic field when the aspect ratio is increased from 0.1 to 0.7. The results of performance criterion have shown that the nanoparticles addition can be useful if a compromised magnetic field value represented by a Hartman number of 30 is applied.

show abstract

Effect of magnetic field on natural convection in a nanofluid-filled semi-circular enclosure with heat flux source

Cited by 49 publications

References 23 publications

Natural Convection and Entropy Generation in a Nanofluid-Filled Semi-Circular Enclosure with Heat Flux Source

Natural Convection and Entropy Generation in a Nanofluid-Filled Semi-Circular Enclosure with Heat Flux Source

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

Entropy Generation and Natural Convection of CuO-Water Nanofluid in C-Shaped Cavity under Magnetic Field

Contact Info

Product

Resources

About