CFD and experimental investigation on the heat transfer characteristics of alumina nanofluids under the laminar flow regime

Azari, Ahmad; Kalbasi, Mansour; Rahimi, Masoud

doi:10.1590/0104-6632.20140312s00001959

Cited by 31 publications

(8 citation statements)

References 46 publications

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“…They presented the results in the form of percentages for both spherical and platelet-shaped nanoparticles under high Reynolds numbers. Similarly, an experimental study is presented by Azari et al [64] for alumina nanofluid flow. They successfully analyzed the two-phased model theoretical results with practically obtained information.…”

Section: Introductionmentioning

confidence: 86%

Viscoelastic MHD Nanofluid Thin Film Flow over an Unsteady Vertical Stretching Sheet with Entropy Generation

et al. 2019

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The boundary-layer equations for mass and heat energy transfer with entropy generation are analyzed for the two-dimensional viscoelastic second-grade nanofluid thin film flow in the presence of a uniform magnetic field (MHD) over a vertical stretching sheet. Different factors, such as the thermophoresis effect, Brownian motion, and concentration gradients, are considered in the nanofluid model. The basic time-dependent equations of the nanofluid flow are modeled and transformed to the ordinary differential equations system by using similarity variables. Then the reduced system of equations is treated with the Homotopy Analysis Method to achieve the desire goal. The convergence of the method is prescribed by a numerical survey. The results obtained are more efficient than the available results for the boundary-layer equations, which is the beauty of the Homotopy Analysis Method, and shows the consistency, reliability, and accuracy of our obtained results. The effects of various parameters, such as Nusselt number, skin friction, and Sherwood number, on nanoliquid film flow are examined. Tables are displayed for skin friction, Sherwood number, and Nusselt number, which analyze the sheet surface in interaction with the nanofluid flow and other informative characteristics regarding this flow of the nanofluids. The behavior of the local Nusselt number and the entropy generation is examined numerically with the variations in the non-dimensional numbers. These results are shown with the help of graphs and briefly explained in the discussion. An analytical exploration is described for the unsteadiness parameter on the thin film. The larger values of the unsteadiness parameter increase the velocity profile. The nanofluid film velocity shows decline due the increasing values of the magnetic parameter. Moreover, a survey on the physical embedded parameters is given by graphs and discussed in detail.

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Section: Introductionmentioning

confidence: 86%

Viscoelastic MHD Nanofluid Thin Film Flow over an Unsteady Vertical Stretching Sheet with Entropy Generation

et al. 2019

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“…In that, Labonté et al [16] showed that the model with constant properties tends to underestimate the wall shear stress and overestimate the heat transfer coefficient. Azari et al [20] found that the single-phase model with constant physical properties provides an acceptable agreement with the experimental data and the temperature-dependent model improves the predictions of the discrete two-phase flow model for low volume fractions in nanoparticles, typically ϕ = 0.03%. On the contrary, at higher particle concentrations ϕ = 3.5%, the two-phase flow performs best.…”

Section: Introductionmentioning

confidence: 89%

“…For example, Mehrez et al [15] numerically investigated the entropy generation and the mixed convection heat transfer of copper/water-based nanofluids in an inclined open cavity with uniform heat flux at the wall. During the last decade, many other authors compared the performance of the different single and two-phase models with constant or temperature-dependent properties in the context of nanofluid flows [16][17][18][19][20][21]. A detailed state-of-the-art review has been besides recently proposed by Kakaç and Pramuanjaroenkij [10].…”

Section: Introductionmentioning

confidence: 99%

Further Investigation on Laminar Forced Convection of Nanofluid Flows in a Uniformly Heated Pipe Using Direct Numerical Simulations

Sekrani

Poncet

2016

Applied Sciences

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Abstract:In the present paper, laminar forced convection nanofluid flows in a uniformly heated horizontal tube were revisited by direct numerical simulations. Single and two-phase models were employed with constant and temperature-dependent properties. Comparisons with experimental data showed that the mixture model performs better than the single-phase model in the all cases studied. Temperature-dependent fluid properties also resulted in a better prediction of the thermal field. Particular attention was paid to the grid arrangement. The two-phase model was used then confidently to investigate the influence of the nanoparticle size on the heat and fluid flow with a particular emphasis on the sedimentation process. Four nanoparticle diameters were considered: 10, 42, 100 and 200 nm for both copper-water and alumina/water nanofluids. For the largest diameter d np = 200 nm, the Cu nanoparticles were more sedimented by around 80%, while the Al 2 O 3 nanoparticles sedimented only by 2.5%. Besides, it was found that increasing the Reynolds number improved the heat transfer rate, while it decreased the friction factor allowing the nanoparticles to stay more dispersed in the base fluid. The effect of nanoparticle type on the heat transfer coefficient was also investigated for six different water-based nanofluids. Results showed that the Cu-water nanofluid achieved the highest heat transfer coefficient, followed by C, Al 2 O 3 , CuO, TiO 2 , and SiO 2 , respectively. All results were presented and discussed for four different values of the concentration in nanoparticles, namely ϕ = 0, 0.6%, 1% and 1.6%. Empirical correlations for the friction coefficient and the average Nusselt number were also provided summarizing all the presented results.

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“…In addition to the enhancement of the thermal conductivity, a volume of a fraction of 2.5% (nanoparticle/base fluid) can also lead to improving convective heat transfer coefficient at a high flow rate [2] [13-15]. Therefore, many numerical and experimental studies have reported that using a base fluid with nanoparticles increased the thermal performance compared to a conventional fluid and this enhancement increase as the concentration of the particles increased [4]. However, a recent numerical study [10] showed that the nanoparticle size has no major impact on the properties of the heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Heat Transfer Rate in Helically Coiled Pipe Using Al2O3/Water Nanofluid

Hasan

2020

DJES

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Nanofluid materials play an important role in the industry nowadays, which has drawn the attention of researchers to enhance the characteristics of the heat transfer of the fluids in the coiled shape heat exchangers. The effect of using Al2O3/water Nano fluid on the characteristic of the heat transfer rate inside the helically coiled pipe was numerically studied at different Reynolds numbers. Moreover, fluid flow analyses were investigated numerically in terms of pressure and velocity profile. The heat transfer enhancement using this Nano fluid has been studied and then compared to pure water at Reynolds number values of 200, 600, and 1500 respectively. The results showed that a reduction in the temperature of the outer wall pipe when Al2O3/water Nano fluid was applied particularly at a low Reynolds number compared to pure water. Generally speaking, it has been seen that the reduction in the temperature profile is much better than the high Reynolds number.

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CFD and experimental investigation on the heat transfer characteristics of alumina nanofluids under the laminar flow regime

Cited by 31 publications

References 46 publications

Viscoelastic MHD Nanofluid Thin Film Flow over an Unsteady Vertical Stretching Sheet with Entropy Generation

Viscoelastic MHD Nanofluid Thin Film Flow over an Unsteady Vertical Stretching Sheet with Entropy Generation

Further Investigation on Laminar Forced Convection of Nanofluid Flows in a Uniformly Heated Pipe Using Direct Numerical Simulations

Numerical Investigation of Heat Transfer Rate in Helically Coiled Pipe Using Al2O3/Water Nanofluid

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