Mixed convection of Al2O3-water nanofluid in a lid-driven cavity having two porous layers

Astanina, Marina S.; Sheremet, Mikhail A.; Öztop, Hakan F.; Abu‐Hamdeh, Nidal H.

doi:10.1016/j.ijheatmasstransfer.2017.11.018

Cited by 86 publications

(20 citation statements)

References 40 publications

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“…Since stream function is constant along a wall, all its derivatives along the wall vanish. Therefore, the stream function Poisson equation Equation (13) (25) where (N) is the normal direction. Moreover, Taylor series expansion will be used so that the boundary conditions for vorticity ( ) will be obtained with truncation error of first order.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…Also, the thermal equilibrium between the alumina nanoparticles and the water was considered. Moreover, Astanina et al 25 investigated mixed convection of Al 2 O 3 -water nanofluid in a lid-driven F I G U R E 1 2D one-sided lid-driven cavity flow configuration, coordinates, and boundary conditions square cavity using two permeable layers that are situated on the base wall. The bottom wall was hot and the upper moving wall was cold and the right, as well as the left walls, was adiabatic.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of three‐sided lid‐driven square cavity

Kamel

Haraz

Hanna

2020

Engineering Reports

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In this article, an incompressible, two-dimensional (2D), time-dependent Newtonian fluid flow in a square cavity is simulated using finite difference method and alternating direction implicit technique. Navier-Stokes equations are solved numerically in stream function-vorticity formulation. In order to verify the numerical solver, the one-sided lid-driven cavity is studied and the results are compared with relevant data in the literature. They were in a very good agreement. Furthermore, two distinguished unexplored cases of the three-sided lid-driven cavity have been investigated. In case (1), the upper and lower walls are translated to the right, while the left wall is translated upward and the right wall remains stationary. Moreover, in case (2), the upper wall is translated to the right but the lower wall is translated to the left, while the left wall is translated downward and the right wall remains stationary. However, stream function and vorticity values in addition to the location of primary and secondary vortices' centers inside the square cavity have been revealed at low and intermediate Reynolds numbers (Re), typically (Re = 100 to 2000). Moreover, the higher the Re, the more main primary vortex approaches the cavity center and the bigger the secondary vortices. K E Y W O R D Sfinite difference method, incompressible flow, lid-driven cavity, Navier-Stokes equations, stream function-vorticity formulation 1 This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Section: Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical simulation of three‐sided lid‐driven square cavity

Kamel

Haraz

Hanna

2020

Engineering Reports

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“…It was noted that the porous media thickness and location were effective on the CHT features. Astanina et al [ 9 ] explored the the effects of porous layer on the CHT a lid-driven cavity. They noted that the average Nu reduced for higher thickness of porous layer.…”

Section: Introductionmentioning

confidence: 99%

Thermal Management and Modeling of Forced Convection and Entropy Generation in a Vented Cavity by Simultaneous Use of a Curved Porous Layer and Magnetic Field

Selimefendigil

Öztop

2021

Entropy

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The effects of using a partly curved porous layer on the thermal management and entropy generation features are studied in a ventilated cavity filled with hybrid nanofluid under the effects of inclined magnetic field by using finite volume method. This study is performed for the range of pertinent parameters of Reynolds number (100≤Re≤1000), magnetic field strength (0≤Ha≤80), permeability of porous region (10−4≤Da≤5×10−2), porous layer height (0.15H≤tp≤0.45H), porous layer position (0.25H≤yp≤0.45H), and curvature size (0≤b≤0.3H). The magnetic field reduces the vortex size, while the average Nusselt number of hot walls increases for Ha number above 20 and highest enhancement is 47% for left vertical wall. The variation in the average Nu with permeability of the layer is about 12.5% and 21% for left and right vertical walls, respectively, while these amounts are 12.5% and 32.5% when the location of the porous layer changes. The entropy generation increases with Hartmann number above 20, while there is 22% increase in the entropy generation for the case at the highest magnetic field. The porous layer height reduced the entropy generation for domain above it and it give the highest contribution to the overall entropy generation. When location of the curved porous layer is varied, the highest variation of entropy generation is attained for the domain below it while the lowest value is obtained at yp=0.3H. When the size of elliptic curvature is varied, the overall entropy generation decreases from b=0 to b=0.2H by about 10% and then increases by 5% from b=0.2H to b=0.3H.

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“…For controlling and enhancement of the convection heat transfer, a liddriven wall is used [7][8][9][10][11][12][13][14] and a rotating cylinder used inside the enclosures [15]. When using Rayleigh number 1-1400 show the influence of the rotating cylinder to increasing thermal transfer by Lewis [16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Mixed Convection on a Rotating Circular Cylinder in a Cavity Filled With Nanofluid and Porous Media

Abdulsahib

Al‐Farhany

2020

QJES

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The present study, experimentally investigated the mixed convection in a square enclosure partitioned in two layers. The experiments were performed with Al2O3–water nanofluid (upper layer) and superposed porous medium (lower layer) with an adiabatic rotating cylinder at the center of the cavity. The boundary conditions of the experimental study were; the upper and lower walls were assumed adiabatic, the right wall was heated, and the left wall was cooled. Experimentally, 15 K-type thermocouples and thermal imaging camera were employed to measure the temperatures distribution inside the cavity when the concentration of nanoparticles (ɸ = 0.06), the temperature difference (∆T) between the cold and hot walls was (6, 8, and 10) °C, and angular rotational velocity (-50, -25, 0, 25, and 50) rpm. The results of experimental data showed that in general, the distribution of temperatures was very well along the upper half of the enclosure, while in the lower half the temperature distribution was confined near the hot wall region. When the circular cylinder rotates in counter-clockwise, it noted that the effect of speed is evident in the downside of the cylinder, while the temperature distribution in the left upper part of the enclosure decreasing. When the circular cylinder rotates in the clockwise direction, the results showed that the effect of cylinder rotation was around cylinder only. Moreover, the results demonstrated that the increasing temperature difference leads to a noticeable increment in the intensity of the flow.

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Mixed convection of Al2O3-water nanofluid in a lid-driven cavity having two porous layers

Cited by 86 publications

References 40 publications

Numerical simulation of three‐sided lid‐driven square cavity

Numerical simulation of three‐sided lid‐driven square cavity

Thermal Management and Modeling of Forced Convection and Entropy Generation in a Vented Cavity by Simultaneous Use of a Curved Porous Layer and Magnetic Field

Experimental Investigation of Mixed Convection on a Rotating Circular Cylinder in a Cavity Filled With Nanofluid and Porous Media

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