Transition to Chaotic Natural Convection of Cu-water Nanofluid in an Inclined Square Enclosure

Boudjeniba, Bilal; Laouer, Abdelghani; Laouar, Salah; Mezaache, El Hacène

doi:10.18280/ijht.370206

Cited by 6 publications

(9 citation statements)

References 16 publications

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“…But this does not mean in any way that heat transfer will decrease by increasing because the thermal conductivity contribution is much higher. Moreover, it is clear that this effect is smaller for = 10 6 . This fact can be mainly attributed to the thermal conductivity which is better manifested in the conduction regime.…”

Section: Inclination Angle and Volume Fraction Effectsmentioning

confidence: 93%

“…The figure shows that the number effect is considerable on the temperature field in the cavity. In its central part, the isotherms that are vertical and parallel to the active walls for = 10 3 become horizontal (stratified) for = 10 6 . In other words, at high numbers, the upper part of the cavity is heated due to the buoyancy effect.…”

Section: 1mentioning

confidence: 99%

“…The effect due to the type of nanoparticles on heat transfer has been further highlighted by Bhuiyana et al [5] considering a square cavity partially heated from its bottom wall. The transition to chaotic natural convection of Cu-water nanofluid inside an inclined square cavity is numerically investigated by Boudjeniba et al [6]. The enclosure is heated from one part of the side and cooled through two other opposite half sides.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Natural Convection and Thermal Radiation Influence on Nanofluids in a Cubical Cavity

Moutaouakil¹,

Boukendil²,

Zrikem³

et al. 2020

IJHT

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This study investigates the effect of thermal radiation on natural convection of several water-based nanofluids H2O-(Cu, Al2O3, Ag, TiO2) in a partially heated cubical cavity where the left vertical side is heated by three identical and parallel elements. The right vertical side is totally cooled, and the other ones are kept adiabatic. A developed code based on the finite volume method and the Rosseland approximation is used to solve the governing equations. Calculations were performed for three inclination angles of the rectangular heating elements 0°, 45° and 90°. The effect of governing parameters, namely, Rayleigh number, solid volume fraction, radiation parameter, dimensionless spacing of the three heating elements, their aspect ratio and different type of nanoparticles on the velocity contours, isotherms as well as local and average Nusselt number were considered. The results indicate that the inclination angle has a considerable effect on the dynamic and thermal fields, but its effect on the average heat transfer is insignificant. The total Nusselt number increases with the volume fraction of nanoparticles, the radiation parameter and the aspect ratio of the heated elements. The numerical results also revealed that the Cu and Ag-water nanofluid offer a better heat exchange.

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Section: Inclination Angle and Volume Fraction Effectsmentioning

confidence: 93%

Section: 1mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Natural Convection and Thermal Radiation Influence on Nanofluids in a Cubical Cavity

Moutaouakil¹,

Boukendil²,

Zrikem³

et al. 2020

IJHT

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“…Several investigations involving square cavities and enclosures of various sizes and aspect ratios have been carried out 20–37 …”

Section: Introductionmentioning

confidence: 99%

A numerical investigation of the effect of sinusoidal temperature on mixed convection flow in a cavity filled with a nanofluid with moving vertical walls

et al. 2022

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The aim of this study is to investigate numerically the effect of sinusoidal temperature on mixed convection flow in a cavity filled with nanofluid and moving vertical walls by using a new temperature function, where thermal heating takes the form of the sinusoidal temperature; and could be found in various natural processes and industries such as solar energy, and cooling of electronic components. The heating is concentrated in the center and then distributed to both ends at different values of Rayleigh numbers, Reynolds numbers, and volumetric fractions of nanoparticles ranging from 1.47 × 103 to 1.47 × 106, 1 to 100, and 0 to 0.1, respectively. The impact of nanoparticle size on thermal characteristics and hydrodynamics was considered and evaluated. From the results, the volume fraction concentration of nanoparticles affects the flow shape and thermal performance in the case of a constant Reynolds number. Moreover, the effect of nanoparticles decreases with the increase of the Reynolds number. Besides this, with increasing the volume percentage of nanoparticles, the rate of heat transmission increases. It is worth noting that the presence of nanoparticles results in height convective heat transfer coefficient. On the other hand, the thickness of thermal boundary layers decreases with increasing Rayleigh number. The current investigation found that the (sinusoidal) temperature change significantly affects heat transfer.

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“…Other investigators have investigated several nanofluidfilled geometries [6][7][8], different thermal boundary conditions, [9][10][11], and different internal shapes [12,13] for improvement and intensification of heat exchange.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Free Convection in a Three-Dimensional Enclosure Full of Nanofluid with the Existence a Magnetic Field

Bouchta¹,

Feddaoui²

2020

EJEE

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A numerical analysis was performed to study the influence of a magnetic field in free convection in a cube full with nanofluid. To solve the equation, we appeal to finite volume method. The SIMPLEC algorithm is used for pressure-velocity coupling. All walls are adiabatic, except for the left and right walls that are heated differently. The effects of the Rayleigh and Hartmann numbers, as well as the volume fraction of nanometric particles were studied. Results are conveyed in the form of isotherms, streamlines, velocity curves and Nusselt numbers. It has been shown that as the percentage of nanoparticles increases and the number of Rayleigh increases, heat transfer improves. Hartman number has considerable influence on hydrodynamic and thermal field.

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Transition to Chaotic Natural Convection of Cu-water Nanofluid in an Inclined Square Enclosure

Cited by 6 publications

References 16 publications

Natural Convection and Thermal Radiation Influence on Nanofluids in a Cubical Cavity

Natural Convection and Thermal Radiation Influence on Nanofluids in a Cubical Cavity

A numerical investigation of the effect of sinusoidal temperature on mixed convection flow in a cavity filled with a nanofluid with moving vertical walls

Numerical Simulation of Free Convection in a Three-Dimensional Enclosure Full of Nanofluid with the Existence a Magnetic Field

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