3D Buoyancy-Induced Flow and Entropy Generation of Nanofluid-Filled Open Cavities Having Adiabatic Diamond Shaped Obstacles

Kolsi, Lioua; Mahian, Omid; Öztop, Hakan F.; Aich, Walid; Borjini, Mohamed Naceur; Abu‐Hamdeh, Nidal H.; Aïssia, Habib Ben

doi:10.3390/e18060232

Cited by 47 publications

(16 citation statements)

References 22 publications

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“…As a numerical method, we had recourse to the potential vector-vorticity formalism ( → ψ − → ω) which allows, in a 3D configuration, the elimination of the pressure, which is a delicate term to treat [16,17]. To eliminate this term, one applies the rotational to the equation of momentum.…”

Section: Governing Equationsmentioning

confidence: 99%

Effects of Movable-Baffle on Heat Transfer and Entropy Generation in a Cavity Saturated by CNT Suspensions: Three-Dimensional Modeling

Al‐Rashed

Aich

Kolsi

et al. 2017

Entropy

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Abstract:Convective heat transfer and entropy generation in a 3D closed cavity, equipped with adiabatic-driven baffle and filled with CNT (carbon nanotube)-water nanofluid, are numerically investigated for a range of Rayleigh numbers from 10 3 to 10 5 . This research is conducted for three configurations; fixed baffle (V = 0), rotating baffle clockwise (V+) and rotating baffle counterclockwise (V−) and a range of CNT concentrations from 0 to 15%. Governing equations are formulated using potential vector vorticity formulation in its three-dimensional form, then solved by the finite volume method. The effects of motion direction of the inserted driven baffle and CNT concentration on heat transfer and entropy generation are studied. It was observed that for low Rayleigh numbers, the motion of the driven baffle enhances heat transfer regardless of its direction and the CNT concentration effect is negligible. However, with an increasing Rayleigh number, adding driven baffle increases the heat transfer only when it moves in the direction of the decreasing temperature gradient; elsewhere, convective heat transfer cannot be enhanced due to flow blockage at the corners of the baffle.

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Section: Governing Equationsmentioning

confidence: 99%

Effects of Movable-Baffle on Heat Transfer and Entropy Generation in a Cavity Saturated by CNT Suspensions: Three-Dimensional Modeling

Al‐Rashed

Aich

Kolsi

et al. 2017

Entropy

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“…Rahman et al [9] studied the double-diffusive natural convection in a triangular solar collector where the effects of Rayleigh number and buoyancy rate are presented with streamlines, isotherms and iso-concentrations as well as heat and mass transfer rates. Other interesting works related to the subject can be found [10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Natural Convection Between Two Coaxial Inclined Cylinders

Gourari¹,

Mebarek‐Oudina²,

Hussein³

et al. 2019

IJHT

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The natural convection flow of water between two coaxial cylinders where the inner cylinder generates a constant heat source is numerically studied. The outer cylinder is cold while the top and bottom walls are thermally insulated. For a laminar flow and an inclination angle equal 0°, 45°, 90° the results are determined in the form of contours of the isotherms and streamlines, average Nusselt number in the annular space. The results show that the average Nusselt number is growing with increasing Rayleigh numbers. The best heat transfer is obtained for the inclination angle 90°.

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“…Kefayati [20] have analyzed the heat transfer and entropy generation of laminar convection of non-Newtonian nanofluids in a porous cavity by the finite difference lattice Boltzmann method. Kolsi et al [21] have considered the natural convection and entropy generation in an open cavity nanofluid filled with an adiabatic diamond shaped obstacle using the finite volume technique. Ismael et al [22] have investigated the entropy generation due to conjugate natural convection-conduction heat transfer in a porous cavity heated by a triangular solid wall and saturated with a CuO-water nanofluid.…”

Section: Introductionmentioning

confidence: 99%

Entropy Generation Analysis and Natural Convection in a Nanofluid-Filled Square Cavity with a Concentric Solid Insert and Different Temperature Distributions

Alsabery

Ishak

Chamkha

et al. 2018

Entropy

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The problem of entropy generation analysis and natural convection in a nanofluid square cavity with a concentric solid insert and different temperature distributions is studied numerically by the finite difference method. An isothermal heater is placed on the bottom wall while isothermal cold sources are distributed along the top and side walls of the square cavity. The remainder of these walls are kept adiabatic. Water-based nanofluids with Al 2 O 3 nanoparticles are chosen for the investigation. The governing dimensionless parameters of this study are the nanoparticles volume fraction (0 ≤ φ ≤ 0.09), Rayleigh number (10 3 ≤ Ra ≤ 10 6), thermal conductivity ratio (0.44 ≤ K r ≤ 23.8) and length of the inner solid (0 ≤ D ≤ 0.7). Comparisons with previously experimental and numerical published works verify a very good agreement with the proposed numerical method. Numerical results are presented graphically in the form of streamlines, isotherms and local entropy generation as well as the local and average Nusselt numbers. The obtained results indicate that the thermal conductivity ratio and the inner solid size are excellent control parameters for an optimization of heat transfer and Bejan number within the fully heated and partially cooled square cavity.

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3D Buoyancy-Induced Flow and Entropy Generation of Nanofluid-Filled Open Cavities Having Adiabatic Diamond Shaped Obstacles

Cited by 47 publications

References 22 publications

Effects of Movable-Baffle on Heat Transfer and Entropy Generation in a Cavity Saturated by CNT Suspensions: Three-Dimensional Modeling

Effects of Movable-Baffle on Heat Transfer and Entropy Generation in a Cavity Saturated by CNT Suspensions: Three-Dimensional Modeling

Numerical Study of Natural Convection Between Two Coaxial Inclined Cylinders

Entropy Generation Analysis and Natural Convection in a Nanofluid-Filled Square Cavity with a Concentric Solid Insert and Different Temperature Distributions

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