Effect of a wavy interface on the natural convection of a nanofluid in a cavity with a partially layered porous medium using the ISPH method

Nguyen, Minh-Hoang; Aly, Abdelraheem M.; Lee, Sangwook

doi:10.1080/10407782.2017.1353385

Cited by 73 publications

(65 citation statements)

References 31 publications

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“…Taking into account all the above assumptions, the continuity, momentum, energy and nanoparticles volume fraction equations (in vorticity-stream function formula) are expressed as ( [19,35,57]…”

Section: Mathematical Analysismentioning

confidence: 99%

“…In the recent studies, several nanofluid models have been examined for estimating their heat transfer enhancement [3][4][5][6][7][8][9][10][11][12]. From the previous investigations [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], it is found that the nanofluids yield an effective enhancement in the heat transfer compared to base fluids with a low thermal conductivity (e.g., water, oil or ethylene glycol).…”

Section: Introductionmentioning

confidence: 99%

“…In their model, one of the sinusoidal walls is maintained at the volatile high temperature and the opposite wavy wall is at a stable low temperature. For our knowledge, there are few studies related to the fluids with dispersed nanoparticles in a partitioned cavity [19,[54][55][56]. Moreover, there are no published studies related to the effect of the porous layers on the wavy cavity filled with the nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

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Heat transfer enhancement in the complex geometries filled with porous media

2021

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The present numerical investigation aims to analysis the enhancement heat transfer in the nanofluid filled-complex geometries saturated with a partially layered porous medium. The vertical walls of the cavity are taken as complex wavy geometries. The horizontal walls of the cavity are flat with insulated temperature. The complex wavy cavity is filled with a nanofluid and the upper half of the wavy cavity is saturated with the porous medium. In the analysis, the governing equations are formulated for natural convection under the Boussinesq approximation in various environments including pure-fluid, nanofluid, and porous medium. In this investigation, the effects of the Rayleigh number (10 3 ≤ ≤ 10 5), Darcy parameter (10 −6 ≤ ≤ 10 −3), thermophoresis parameter (0.1 ≤ ≤ 0.5), nanofluid buoyancy ratio (0.1 ≤ ≤ 0.5), Brownian motion parameter (0.1 ≤ ≤ 0.5), inclination angle (0 0 ≤ ≤ 90 0), and geometry parameters 1 and have been studied on the streamlines, temperature, nanoparticles volume fraction, local Nusselt number and the local Sherwood number ℎ. It is found that, the performance of the heat transfer can be improved by adjusting the geometry parameters of the wavy surface. Overall, the results showed that the nanofluid parameters enhance the convection heat transfer and the obtained results provide a useful insight for enhancing heat transfer in two separate layers of nanofluid and porous medium inside complex-wavy cavity.

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Section: Mathematical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heat transfer enhancement in the complex geometries filled with porous media

2021

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“…• Table 1 represents the thermophysical properties of water and Al 2 O 3 at 310 . The partial governing equations in Lagrangian form are described as: [27,36,37,48,50,51]…”

Section: Mathematical Formulationsmentioning

confidence: 99%

Natural convection of Al₂O₃‐water nanofluid filled annulus between a wavy rectangle and a square cavity using Buongiorno's two‐phase model

Aly

2020

Z Angew Math Mech

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In this work, an incompressible smoothed particle hydrodynamics (ISPH) method is used to simulate the natural convection of Al2O3‐water nanofluid filled annulus between a wavy rectangle and a square cavity using non‐homogenous Buongiorno's two‐phase model. In the physical model, the left cavity wall is kept at a high temperature Th, the right wall has a lower temperature Tc, and the horizontal walls are adiabatic. The Lagrangian description of the partial governing equations is discretized using ISPH method. Simulations were carried out for variable wave amplitude (0.01≤A≤0.12), variable wave length of wavy rectangle (0.3≤Lr≤0.8), and variable average of nanoparticle volume fraction (1%≤ϕavg≤10%). Moreover, two cases of thermal conductions including adiabatic and cooling conditions for the inner wavy blockage were considered. The length of the inner wavy rectangle plays an important role on controlling the convective heat transfer and fluid intensity through the annulus. An increase on the length and amplitude of the wavy rectangle reduces the convection flow, maximum values of the stream function and strength of the velocity field. A growing on the average of nanoparticle volume fraction ϕavg reduces the maximum of the stream function, normalized nanoparticle volume fractions φ∗, and average Nusselt number.

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“…So, to simulate the fluid-flow in the porous medium, values of Darcy number must be small. The recent published studies revealed that the preferred range of Darcy number between 10 -2 -10 -6 , see for example Krishna et al [3,4] and Nguyen et al [5].…”

mentioning

confidence: 99%

A revised model of "Steady laminar natural convection of nanofluid under the impact of magnetic field on 2-D cavity with radiation" [AIP advances 9, 065008 (2019); https://doi.org/10.1063/1.5109192]

Nabwey

2020

THERM SCI

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This discussion exhibits the major scientific errors on the recent published paper, entitled "Steady Laminar Natural Convection of Nanofluid Under the Impact of Magnetic Field on 2-D Cavity with Radiation" and their corrections indifferently. In Saleem et al. [1], the authors stated in both of abstract and problem assumptions that the non-Darcy model is used for the porous medium, while the porous terms are incompatible with this assumption. In addition, the authors used a noninclined geometry in their investigation, but the governing equations are conflicting with this hypothesis. Further, the used range of the Darcy number is between 10-2-10 2 and this range is very large and did not represent the porous media flow. All of these observations make the mathematical formulations and the obtained results of Saleem et al. [1] are wrong. In the following sections, these scientific errors and their corrections will be presented minutely.

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Effect of a wavy interface on the natural convection of a nanofluid in a cavity with a partially layered porous medium using the ISPH method

Cited by 73 publications

References 31 publications

Heat transfer enhancement in the complex geometries filled with porous media

Heat transfer enhancement in the complex geometries filled with porous media

Natural convection of Al₂O₃‐water nanofluid filled annulus between a wavy rectangle and a square cavity using Buongiorno's two‐phase model

A revised model of "Steady laminar natural convection of nanofluid under the impact of magnetic field on 2-D cavity with radiation" [AIP advances 9, 065008 (2019); https://doi.org/10.1063/1.5109192]

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Effect of a wavy interface on the natural convection of a nanofluid in a cavity with a partially layered porous medium using the ISPH method

Cited by 73 publications

References 31 publications

Heat transfer enhancement in the complex geometries filled with porous media

Heat transfer enhancement in the complex geometries filled with porous media

Natural convection of Al2O3‐water nanofluid filled annulus between a wavy rectangle and a square cavity using Buongiorno's two‐phase model

A revised model of "Steady laminar natural convection of nanofluid under the impact of magnetic field on 2-D cavity with radiation" [AIP advances 9, 065008 (2019); https://doi.org/10.1063/1.5109192]

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Natural convection of Al₂O₃‐water nanofluid filled annulus between a wavy rectangle and a square cavity using Buongiorno's two‐phase model