Natural-convection of Newtonian fluids between two concentric cylinders of a special cross-sectional form

Laidoudi, Houssem; Helmaoui, Mustapha; Bouzit, Mohamed; Ghenaim, Abdellah

doi:10.2298/tsci200201190l

Cited by 19 publications

(14 citation statements)

References 31 publications

(50 reference statements)

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“…This is a group of works that illustrate the aforementioned conclusion (Koca et al, 2008;Baranwal and Chhabra, 2016;Al-Amir et al, 2019;Laidoudi and Ameur, 2020). On the other hand, some other works resorted to the use of non-Newtonian fluids to develop thermal activity (Kefayati, 2015;Molla and Yao, 2009;Laidoudi et al, 2021Laidoudi et al, , 2020Guendouci et al, 2021;Mahdy et al, 2010). These types of fluids are distinguished by their ability to change their viscosity, which allows a change in their heat transfer properties.…”

Section: Introductionmentioning

confidence: 94%

Behavior of Non-Newtonian Fluid in a Lid-Driven Chamber With Heated Bodies Subjected to a Uniform Magnetic Field

Anouar

2023

JSSCM

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Recent studies have attempted to find methods and techniques that enable the development of heat transfer within thermal transformers. For this purpose, this paper includes a numerical simulation of a non-Newtonian fluid inside a chamber with four hot bodies. The chamber is exposed to a magnetic field of constant and uniform intensity. Also, the upper wall of the chamber has a horizontal movement. The study is based on the quality of heat transfer between the heated parts of the chamber and the complex fluid under the influence of a set of criteria, namely Reynolds number (= 1 to 40); Hartmann number (= 0 to 100); power-law index (= 0.6 to 1.4) and Richardson number (0 to 100). The interpretation of the results is done by displaying the path-lines and isotherms distribution. Also, the amount of thermal transfer of the hot bodies is given in terms of the Nusselt number. The results showed that the positioning of the hot bodies plays an important role in heat transfer. Moreover, increasing the value of the power-law index makes the fluid stickier, which reflects its negative effect on heat transfer.

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Section: Introductionmentioning

confidence: 94%

Behavior of Non-Newtonian Fluid in a Lid-Driven Chamber With Heated Bodies Subjected to a Uniform Magnetic Field

Anouar

2023

JSSCM

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“…It is used in either cooling systems for thermal transformers and heating devices or in thermal insulation systems. Because of the importance of these systems in daily life, researchers have provided interesting results from these systems under various initial conditions [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Lid-Driven Chamber with 3D Elliptical Obstacle under the Impacts of the Nano-Properties of the Fluid, Lorentz Force, Thermal Buoyancy, and Space Porosity

et al. 2022

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In this work, we have performed an investigation to increase our understanding of the motion of a hybrid nanofluid trapped inside a three-dimensional container. The room also includes a three-dimensional heated obstacle of an elliptic cross-section. The top wall of space is horizontally movable and adiabatic, while the lower part is zigzagged and thermally insulated as well. The lateral walls are cold. The container’s space is completely replete with Al2O3-Cu/water; the concentration of nanoparticles is 4%. The space is also characterized by the permeability, which is given by the value of the Darcy number (limited between 10−5 and 10−2). This studied system is immersed in a magnetic field with an intensity is defined in terms of Hartmann number (limited between 0 and 100). The thermal buoyancy has a constant impact (Gr = 1000). This study investigates the influences of these parameters and the inclination angle of the obstacle on the heat transfer coefficient and entropy generation. The Galerkin finite element method (GFEM) was the principal technique for obtaining the solution of the main partial equations. Findings from our work may be exploited to depict the conditions for which the system is effective in thermal cooling and the case in which the system is effective in thermal insulation.

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“…A strong evolution of thermal activity in terms of rotational speed was understood. Laidoudi et al (2021b) studied the thermal activity between two thermally different objects locked inside an isolated room. The aim of the study was to evaluate the thermal activity between the two elements under a set of conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Nanofluid Natural Convection Flow in a Cpu Heat Sink Using Buongiorno Tow-Phase Model

Anouar¹,

Mokhefi²

2022

JSSCM

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In this paper, a numerical investigation using the finite element method on the cooling capacity of an electronic heat sink has been presented. This heat sink is intended for cooling applications of micro-computer CPUs. It deals with a parallelepipedal block with rectangular fins, filled with a nanofluid and crossed by four cylindrical pipes in which a cooling gas flows and dissipates the heat generated by the processor. Indeed, the cooling occurs by three transfers: the first one evacuates the heat from the processor towards the gas, the second one transfers this heat towards the nanofluid and the last one is cooled from the ambient air by means of the fins laterally arranged on the block. From this work, it has been planned to contribute to the study of the behavior of a nanofluid in the heat sink in the presence of a uniform magnetic field in order to enhance the operating and cooling performances. The effects of some control parameters have been highlighted on the hydrodynamic, thermal, and mass behavior of the nanofluid, namely: the Rayleigh number (103 â‰¤ Ra â‰¤ 105), the Hartmann number (0 â‰¤ Ha â‰¤ 100), the angle of inclination of the magnetic field (0 â‰¤ Î³ â‰¤ 90Â°) and the nanoparticles diameter (1 nm â‰¤ dp â‰¤ 10 nm). On the other hand, a new fin design has been proposed in this study allowing the enhancement of the heat exchange rate with ambient medium. The studied phenomenon is governed by the equations of the two-phase nanofluid model proposed by Buongiorno and which describe the following balances: mass, momentum, energy and nanoparticles. The system of partial differential equations with initial-boundary conditions has been solved by the finite element method. After performing a mesh independence check and validating with previous papers, the results of the investigation were presented. They showed that the application of a magnetic field significantly reduces the rate of heat exchange. However, increasing the angle of inclination of this field promotes convective heat transfer. Moreover, the use of zigzag fins improves the cooling rate by about 4% for amplitude of 0.05 compared to the standard configuration.

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Natural-convection of Newtonian fluids between two concentric cylinders of a special cross-sectional form

Cited by 19 publications

References 31 publications

Behavior of Non-Newtonian Fluid in a Lid-Driven Chamber With Heated Bodies Subjected to a Uniform Magnetic Field

Behavior of Non-Newtonian Fluid in a Lid-Driven Chamber With Heated Bodies Subjected to a Uniform Magnetic Field

Lid-Driven Chamber with 3D Elliptical Obstacle under the Impacts of the Nano-Properties of the Fluid, Lorentz Force, Thermal Buoyancy, and Space Porosity

Numerical Investigation of the Nanofluid Natural Convection Flow in a Cpu Heat Sink Using Buongiorno Tow-Phase Model

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