Effect of magnetic field on natural convection in a triangular enclosure filled with nanofluid

Mahmoudi, Amir Houshang; Pop, Ioan; Shahi, Mina

doi:10.1016/j.ijthermalsci.2012.04.006

Cited by 169 publications

(55 citation statements)

References 30 publications

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“…The effect of the magnetic field on the flow and heat transfer is more complicated; it may reduce or deteriorate the heat transfer in nanofluids depending on the situations. The effect of the enhancement [23,60] and the suppression [91,92] of the magnetic field has been indicated by previous studies. …”

Section: Flow At High Reynolds Numbermentioning

confidence: 63%

Effects of Anisotropic Thermal Conductivity and Lorentz Force on the Flow and Heat Transfer of a Ferro-Nanofluid in a Magnetic Field

Yan

Massoudi

et al. 2017

Energies

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Abstract:In this paper, we study the effects of the Lorentz force and the induced anisotropic thermal conductivity due to a magnetic field on the flow and the heat transfer of a ferro-nanofluid. The ferro-nanofluid is modeled as a single-phase fluid, where the viscosity depends on the concentration of nanoparticles; the thermal conductivity shows anisotropy due to the presence of the nanoparticles and the external magnetic field. The anisotropic thermal conductivity tensor, which depends on the angle of the applied magnetic field, is suggested considering the principle of material frame indifference according to Continuum Mechanics. We study two benchmark problems: the heat conduction between two concentric cylinders as well as the unsteady flow and heat transfer in a rectangular channel with three heated inner cylinders. The governing equations are made dimensionless, and the flow and the heat transfer characteristics of the ferro-nanofluid with different angles of the magnetic field, Hartmann number, Reynolds number and nanoparticles concentration are investigated systematically. The results indicate that the temperature field is strongly influenced by the anisotropic behavior of the nanofluids. In addition, the magnetic field may enhance or deteriorate the heat transfer performance (i.e., the time-spatially averaged Nusselt number) in the rectangular channel depending on the situations.

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Section: Flow At High Reynolds Numbermentioning

confidence: 63%

Effects of Anisotropic Thermal Conductivity and Lorentz Force on the Flow and Heat Transfer of a Ferro-Nanofluid in a Magnetic Field

Yan

Massoudi

et al. 2017

Energies

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“…Many numerical studies have been carried out to clarify the heat transfer characteristics of nanofluids as innovative heat transfer fluids by considering various model systems, such as a simple square cavity subjected to time-dependent temperature boundary conditions (Wang et al, 2014), a two-dimensional square enclosure (H (height)×L (width)) with a vertical heat source (0.4H×0.1L) mounted on the central part of the bottom of the enclosure (Mahmoudi and Abu-Nada, 2013), a cold outer circular enclosure containing a hot inner sinusoidal circular cylinder (Sheikholeslami et al, 2012), a partially heated horizontal microchannel , a triangular enclosure with two identical heat sources on the horizontal and diagonal walls (Mahmoudi et al, 2012), and a horizontal cylinder heated from one end and cooled from the other (Meng and Li, 2015). Recently, Haddad et al (2012a) conducted a comprehensive review of research progress on the natural convective heat transfer characteristics of nanofluids in various types of enclosures for both experimental and theoretical studies.…”

Section: Introductionmentioning

confidence: 99%

Natural convective heat transfer characteristics of Rayleigh-Benard convection of Al<sub>2</sub>O<sub>3</sub>-water nanofluids

Akamatsu

Izawa

Kawamura

et al. 2017

JTST

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Transient three-dimensional numerical computations are implemented to clarify the natural convective heat transfer characteristics of the Rayleigh-Benard convection of Al2O3-water nanofluids induced in a shallow vertical cylindrical enclosure. The thermophysical properties of nanofluids, assumed to be a single-phase fluid in the numerical computations, are estimated using the experimental correlation equations reported by Khanafer and Vafai (2011). When the average Nusselt numbers of nanofluids are plotted against the Rayleigh number defined by the thermophysical properties of water, computations for four different volume fractions of nanoparticles were below the average Nusselt number curve experimentally reported by Silveston (1958). The diagram also reveals that the increase of nanoparticles in the base fluid delays the generation of Rayleigh-Benard convection. However, the average Nusselt numbers of nanofluids almost agreed with the average Nusselt numbers of Silveston without depending on the volume fraction of nanoparticles when plotted against the Rayleigh number defined by the thermophysical properties of nanofluids. Thus, the natural convection heat transfer rates of Al2O3-water nanofluids can be considered to be similar to the general fluids reported by Silveston as long as experimental thermophysical properties are employed.

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“…Nanofluids can be used to improve thermal management systems in many engineering applications such as transportation, micromechanics instrument and cooling devices. Due to the encouraged enhanced properties associated with nanofluids properties, huge works have been published since about two decades ago (Aminossadati and Ghasemi [16], Ghasemi and Aminossadati [17], Abu-Nada and Chamkha [18], Nemati et al [19], Mahmoudi et al [20], Matin and Pop [21], Sheikhzadeh et al [22], and Sheikholeslami et al [23,24]). …”

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

136

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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.

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Effect of magnetic field on natural convection in a triangular enclosure filled with nanofluid

Cited by 169 publications

References 30 publications

Effects of Anisotropic Thermal Conductivity and Lorentz Force on the Flow and Heat Transfer of a Ferro-Nanofluid in a Magnetic Field

Effects of Anisotropic Thermal Conductivity and Lorentz Force on the Flow and Heat Transfer of a Ferro-Nanofluid in a Magnetic Field

Natural convective heat transfer characteristics of Rayleigh-Benard convection of Al<sub>2</sub>O<sub>3</sub>-water nanofluids

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

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