Effects of Prandtl Number on Natural Convection in a Cavity Filled with Silver/Water Nanofluid-Saturated Porous Medium and Non-Newtonian Fluid Layers Separated by Sinusoidal Vertical Interface

Al-Amir, Qusay Rasheed; Ahmed, Saba Y.; Hamzah, Hameed K.; Ali, Farooq H.

doi:10.1007/s13369-019-04115-y

Cited by 23 publications

(8 citation statements)

References 38 publications

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“…It was concluded that increasing Ra and Da leads to a clear enhancement in the average Nusselt number. Al-Amir et al [32] studied numerically the influence of Prandtl number in a square enclosure. This enclosure was filled by two layers of Ag-water as a porous medium and saturated with a non-Newtonian fluid and nanofluid separated by a vertical interface of sinusoidal shape.…”

Section: Heat Transfer Inside Cavity With Nanofluid and Porous Mediamentioning

confidence: 99%

Review of the Effects of Stationary/Rotating Cylinder in a Cavity on the Convection Heat Transfer in Porous Media with/without Nanofluid

Abdulsahib¹,

Al‐Farhany²

2021

MMEP

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The mixed convective heat transfer has many multiple engineering applications, such as solar collectors, electronic equipment cooling and heat exchanger, and geothermal engineering. This work presents comprehensive coverage of a wide range of published studies in terms of convection heat transfer inside the enclosure in recent years. The convective heat transfer in porous media with/without nanofluid, and the effect of stationary/rotating cylinder inside cavities, as well as the position of the cylinder, had been addressed and discuss to draw the main conclusions and recommendations. It is worthy to mention that the mixed convective with the effect of entropy generation with inner bodies in enclosure has been investigated less than the other simple enclosure shapes due to its complexity. The researchers can be extended their future studies by adding the MHD effects with mixed conviction in simple/complex shapes of enclosure. This study gives an important and useful summary for provides researchers of heat transfer in academic and industrial. At the end of this investigation, the governing equations of the 2-D mixed convection in an enclosure filled with porous medium, and nanofluid addressed.

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Section: Heat Transfer Inside Cavity With Nanofluid and Porous Mediamentioning

confidence: 99%

Review of the Effects of Stationary/Rotating Cylinder in a Cavity on the Convection Heat Transfer in Porous Media with/without Nanofluid

Abdulsahib¹,

Al‐Farhany²

2021

MMEP

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“…In the model, the matrix considers the fluid with an LTNE state; thus, a 2D approach is utilized for assuming the macroscopic heat transfer between two phases (solid and fluid). Ostwald‐de Waele equation has been assumed to describe the behavior of a non‐Newtonian fluid in the current work 2,22,25,28,31‐33 . The studied variables and the corresponding dimensionless parameters and thermophysical properties have been shown in Tables 1 and 2, respectively.…”

Section: Physical and Mathematical Modelingmentioning

confidence: 99%

“…Nanofluid free convection in the porous matter has been used in numerous applications, for example, insulation purposes, medicines, geothermal reservoirs, and chemical catalytic reactors 25‐27 . Kefayati 28 studied the heat transferred by free convection in a porous cavity filled by non‐Newtonian nanofluids.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of natural convection of a non‐Newtonian nanofluid in an F‐shaped porous cavity

et al. 2020

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This study numerically investigates the free convective heat transfer of a non‐Newtonian nanofluid through an F‐shaped porous cavity. The thermal conditions of the walls of the cavity are assigned as TC and TH for the cold right wall and the hot left wall, respectively, and the remaining walls of the cavity are assigned as insulated walls. The model for this investigation is designed, implemented, and analyzed by COMSOL Multiphysics. The Galerkin finite element method is used to model and solve the governing equations of the flow and heat transfer process inside the porous media. Physical parameters are presented in the following order: 6 × 10 − 2 ≥ φ ≥ 0.0 , 0.4 ≥ A R ≥ 0.1 , 10 − 1 ≥ D a ≥ 10 − 3 , 1.4 ≥ n ≥ 0.6 , and 10 ≥ R a ≥ 10 6. The goal of this study is to study the influence of geometry configuration (F shape) and the above parameters on the flow structure, isotherms, and heat transfer. These parameters have been taken into account to investigate their effects on this kind of heat transfer mechanism. Results show that the addition of nanoparticles plays a significant role in changing heat transfer rates. In addition, an increase in the aspect ratio (AR) leads to create narrow areas, which promotes the stagnation zones, thus decreasing the distance between cold and hot walls. This, in turn, enhances the flow uniformity. Moreover, it has been generally concluded that the Nusselt number and velocity rates are directly proportional to the AR, Darcy number (Da), and Rayleigh number (Ra), and negatively proportional to the power‐law index ( n); however, there are some exceptions and unusual behaviors noticed and explained through the paper.

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“…They found heat transfer rates in natural convection would increase with 𝑃 𝑟. Dubrulle [16] also concentrated on the scaling relations in large 𝑃 𝑟 natural convection. However, the author claimed heat transfer intensity would slightly decreased against 𝑃 𝑟. Al-Amir et al [17] simulated natural convection in a cavity filled by porous media and discussed the effect of 𝑃 𝑟 on heat transfer. Their numerical results illustrated that the average Nusselt (𝑁𝑢) number did not depend on 𝑃 𝑟 monotonously.…”

Section: Introductionmentioning

confidence: 99%

Natural convection of large Prandtl number fluids: A controversy answered by a new thermal lattice Boltzmann model

Chen

Luo

Jain

et al. 2023

Case Studies in Thermal Engineering

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Effects of Prandtl Number on Natural Convection in a Cavity Filled with Silver/Water Nanofluid-Saturated Porous Medium and Non-Newtonian Fluid Layers Separated by Sinusoidal Vertical Interface

Cited by 23 publications

References 38 publications

Review of the Effects of Stationary/Rotating Cylinder in a Cavity on the Convection Heat Transfer in Porous Media with/without Nanofluid

Review of the Effects of Stationary/Rotating Cylinder in a Cavity on the Convection Heat Transfer in Porous Media with/without Nanofluid

Numerical investigation of natural convection of a non‐Newtonian nanofluid in an F‐shaped porous cavity

Natural convection of large Prandtl number fluids: A controversy answered by a new thermal lattice Boltzmann model

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