Numerical investigation of combined buoyancy-thermocapillary convection and entropy generation in 3D cavity filled with Al 2 O 3 nanofluid

Kolsi, Lioua; Lajnef, Emtinene; Aich, Walid; Alghamdi, Abdulaziz S.; Aichouni, Mohamed; Borjini, Mohamed Naceur; Aïssia, Habib Ben

doi:10.1016/j.aej.2016.09.005

Cited by 57 publications

(15 citation statements)

References 20 publications

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“…They further indicated that the fluid temperature increases when the internal heat generation parameter increases. Other interesting results related to MHD, thermo-capillary convection and partially heated cavity can be found in the literature [10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 84%

Magneto-thermocapillary-buoyancy convection in a square cavity with partially active vertical walls

et al. 2019

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Effect of magnetic field on combined surface tension and buoyancy convection in an enclosure with partially active vertical walls is investigated numerically. The active part of the left side wall is at a higher temperature than the active part of the right side wall. The bottom and the inactive parts of the side walls are adiabatic and capillary forces occur at the top free surface. The governing equations are discretized by the finite volume method. The results are obtained for Pr = 0.054, 0 ≤ Ha ≤ 100, 0 ≤ Ma ≤ 10000, and 2.10 4 ≤ Gr ≤ 2.10 6. The flow structure and temperature field were presented by streamlines and isotherms respectively. The surface tension effect of is manifested by increasing Marangoni number. The application of magnetic field was found to control the flow and to oppose the capillary effects.

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Section: Introductionmentioning

confidence: 84%

Magneto-thermocapillary-buoyancy convection in a square cavity with partially active vertical walls

et al. 2019

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“…Huminic and Huminic [ 26 ] studied heat transfer and entropy generation of nanofluids under laminar flow regime in helical heat exchangers; these authors found that heat transfer coefficients, Nusselt number, and heat exchanger effectiveness increased in proportion to nanoparticle volume concentration, while entropy generation due to thermal effects was reduced. Kolsi et al [ 27 ] carried out numerical simulations of convection and entropy caused by the combined effects of convection and thermocapillarity in a cavity containing a nanofluid. The effects of thermocapillary activity and the increase in the volume fraction of nanoparticles resulted in increased entropy.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Nanofluid Irreversibilities in a Heat Exchanger Used with an Aqueous Medium

Ovando-Chacon¹,

Ovando-Chacón

León³

et al. 2020

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Heat exchangers play an important role in different industrial processes; therefore, it is important to characterize these devices to improve their efficiency by guaranteeing the efficient use of energy. In this study, we carry out a numerical analysis of flow dynamics, heat transfer, and entropy generation inside a heat exchanger; an aqueous medium used for oil extraction flows through the exchanger. Hot water flows on the shell side; nanoparticles have been added to the water in order to improve heat transfer toward the cold aqueous medium flowing on the tube side. The aqueous medium must reach a certain temperature in order to obtain its oil extraction properties. The analysis is performed for different Richardson numbers (Ri = 0.1–10), nanofluid volume fractions (φ = 0.00–0.06), and heat exchanger heights (H = 0.6–1.0). Results are presented in terms of Nusselt number, total entropy generation, Bejan number, and performance evaluation criterion. Results showed that heat exchanger performance increases with the increase in Ri when Ri > 1 and when reducing H.

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“…Nevertheless, opposite results are observed with larger nanoparticles diameter. Buoyancy-thermocapillary driven convection flow and heat transfer inside 3D differentially heated cavity filled with Al 2 O 3 nanofluid are carried out by Kolsi et al [13]. It was mentioned that the increase of nanoparticles volume fraction leads to an enhancement of heat transfer as well as the flow intensity regardless the Marangoni number values.…”

Section: Introductionmentioning

confidence: 99%

3D Magneto-Buoyancy-Thermocapillary Convection of CNT-Water Nanofluid in the Presence of a Magnetic Field

et al. 2020

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A numerical study is performed to investigate the effects of adding Carbon Nano Tube (CNT) and applying a magnetic field in two directions (vertical and horizontal) on the 3D-thermo-capillary natural convection. The cavity is differentially heated with a free upper surface. Governing equations are solved using the finite volume method. Results are presented in term of flow structure, temperature field and rate of heat transfer. In fact, results revealed that the flow structure and heat transfer rate are considerably affected by the magnitude and the direction of the magnetic field, the presence of thermocapillary forces and by increasing nanoparticles volume fraction. In opposition, the increase of the magnetic field magnitude leads to the control the flow causing flow stabilization by merging vortexes and reducing heat transfer rate.

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Numerical investigation of combined buoyancy-thermocapillary convection and entropy generation in 3D cavity filled with Al 2 O 3 nanofluid

Cited by 57 publications

References 20 publications

Magneto-thermocapillary-buoyancy convection in a square cavity with partially active vertical walls

Magneto-thermocapillary-buoyancy convection in a square cavity with partially active vertical walls

Numerical Study of Nanofluid Irreversibilities in a Heat Exchanger Used with an Aqueous Medium

3D Magneto-Buoyancy-Thermocapillary Convection of CNT-Water Nanofluid in the Presence of a Magnetic Field

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