Backward-facing step heat transfer of the turbulent regime for functionalized graphene nanoplatelets based water–ethylene glycol nanofluids

Amiri, Ahmad; Arzani, H.; Kazi, S.N.; Chew, Bee Teng; Badarudin, A.

doi:10.1016/j.ijheatmasstransfer.2016.02.042

Cited by 39 publications

(7 citation statements)

References 35 publications

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“…other researchers [23]. The highest h were obtained at the higher c Reynolds number of 16000 and weight concentration of 0.1 wt.%, similar results were obtained by the previous researcher for a study of heat transfer in BFS [36].…”

Section: Resultssupporting

confidence: 87%

Toward improved heat dissipation of the turbulent regime over backward-facing step for the AL2O3-water nanofluids: An experimental approach

et al. 2019

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Experimental study of nanofluid flow and heat transfer to fully developed turbulent forced convection flow in a uniformly heated tubular horizontal backward-facing step has reported in the present study. To study the forced convective heat transfer coefficient in the turbulent regime, an experimental study is performed at a different weight concentration of Al O nanoparticles. The experiment had conducted for water and 2 3 Al O-water nanofluid for the concentration range of 0 to 0.1 wt.% and Reynolds number 2 3 of 4000 to 16000. The average heat transfer coefficient ratio increases significantly as Reynolds number increasing, increased from 9.

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Section: Resultssupporting

confidence: 87%

Toward improved heat dissipation of the turbulent regime over backward-facing step for the AL2O3-water nanofluids: An experimental approach

et al. 2019

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“…Similar trends were obtained also by Amiri et al[126] who focused on the ethylene glycol-functionalized graphene nanoplatelets (EGGnP) which were synthesized covalently, dispersed in water+ethylene glycol (40:60 volumetric ratio) without using any surfactant. Amiri et al[126] confirmed the Newtonian behavior of EGGnP dispersions loaded with nanoparticle concentrations in the range of 0.01-0.2 wt.% at 298 K and shear rates between 20-160 s -1 .Additionally, viscosity measurements in the temperature range from 298 to 338 K showed that, even though the viscosity increased with the concentration of nanoparticles, those rises were almost insignificant when compared with the water-EG mixture. Other authors interested in the study of functionalized graphene, as Arzani et al[127] who prepared aqueous nanofluids loaded with 0.025-0.1 wt% of either covalent (GnP-COOH) and noncovalent (GnP-SDBS) functionalized graphene nanoplatelets.…”

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confidence: 83%

Graphene-based nanofluids: A comprehensive review about rheological behavior and dynamic viscosity

Hamze

Cabaleiro

Estellé

2021

Journal of Molecular Liquids

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Graphene derivatives are promising nanomaterials for producing nanofluids due to their excellent intrinsic characteristics. Among thermophysical profile, and in addition to thermal properties, relevant property to evaluate the potential of graphene-based nanofluids as efficient and reliable heat transfer fluids is viscosity, and rheological behavior in a wider sense. Therefore, the aim of this review paper is to give a comprehensive overview of the current knowledge and results about the rheological properties of graphene-based nanofluids. After a brief description of the most common methods used for fabricating or extracting graphene derivatives, the main steps of graphenebased nanofluids preparation are introduced. Then, literature results on Newtonian/non-Newtonian behavior as well as variations in apparent dynamic viscosity of suspensions containing graphene derivatives are reviewed, analyzing the effects of shear rate, concentration, base fluids and temperature. Such an analysis is performed distinguishing the different types of graphene derivatives, namely graphene oxide, reduced graphene oxide, pristine graphene, graphene quantum dots, functionalized and doped graphene. Also, the impact of base fluid, temperature, concentration and surfactant on viscosity enhancement of graphene-based nanofluids is graphically and newly presented and discussed. In addition, the current models for viscosity prediction or correlation of those nanofluids are detailed. Finally, challenges and future works are summarized.

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“…The mass and momentum transfer in the nanofluid improved, which leads to an improvement of the heat transfer. Amiri et al [26] added an experimental study on the thermo-physical properties of egg nucleoplasmin (EggNP). The results indicate that a greater weight nanofluid concentration involves a faster rate of heat transfer on a backward facing step.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Curvature Angle in a Conduit with an Adiabatic Cylinder over a Backward Facing Step on the Magnetohydrodynamic Behaviour in the Presence of a Nanofluid

Derbal¹,

Bouzit²,

Mokhefi³

et al. 2023

sv-jme

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A backward facing duct are present in various industrial applications especially those focused on heat transfer. The flow through a curved backward facing duct especially in the presence of nanofluid presents complexities compared to a straight backward facing step (BFS) duct. Therefore, the present numerical study deals a nanofluid flow (Fe3O4-H2O) forced convection in a curved backward facing duct. The objective of this investigation is to visualize at different curvature angles g (0°, 30°, 45°, 60°, 90°) imposed on the top wall of the duct, the effect of Hartmann number Ha (0, 50, 100), magnetic field inclination angle γ (0°, 60°, 90°), Reynolds number Re (10, 100, 200) and nanoparticle volume fraction φ (0 %, 0.05 %, 0.1 %). The dimensionless governing equations are solved using the multigrid finite element method. The results showed that the heat transfer was enhanced at the curved angle g = 90° for large Hartman numbers, thus, the average Nusselt number increased with a ratio of 240.74 % in the case of Hartmann number (Ha = 100).

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Backward-facing step heat transfer of the turbulent regime for functionalized graphene nanoplatelets based water–ethylene glycol nanofluids

Cited by 39 publications

References 35 publications

Toward improved heat dissipation of the turbulent regime over backward-facing step for the AL2O3-water nanofluids: An experimental approach

Toward improved heat dissipation of the turbulent regime over backward-facing step for the AL2O3-water nanofluids: An experimental approach

Graphene-based nanofluids: A comprehensive review about rheological behavior and dynamic viscosity

Effect of the Curvature Angle in a Conduit with an Adiabatic Cylinder over a Backward Facing Step on the Magnetohydrodynamic Behaviour in the Presence of a Nanofluid

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