Numerical investigation on nanofluids turbulent convection heat transfer inside a circular tube

Bianco, Vincenzo; Manca, Oronzio; Nardini, Sergio

doi:10.1016/j.ijthermalsci.2010.03.008

Cited by 215 publications

(126 citation statements)

References 30 publications

(69 reference statements)

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“…This confirms the previous results of Akbari et al [19] and Bianco et al [17]. On the other hand, the heat transfer coefficient predicted by the mixture model clearly increases with increased nanoparticle concentration in agreement with previous observations [18,19,30,41]. The superiority of the mixture model may be easily explained.…”

Section: Comparative Analysis Of Single-phase and Mixture Modelssupporting

confidence: 92%

“…Many authors [18,19,30,41] have already shown that the mixture model performs better than single-phase or other two-phase models like the Eulerian or volume of fluid models. Nevertheless, it is crucial to use appropriate correlations for the effective nanofluid properties to obtain accurate results with single-phase models.…”

Section: Comparative Analysis Of Single-phase and Mixture Modelsmentioning

confidence: 99%

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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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Section: Comparative Analysis Of Single-phase and Mixture Modelssupporting

confidence: 92%

Section: Comparative Analysis Of Single-phase and Mixture Modelsmentioning

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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“…Equation (3) was originally introduced in [20] for determining density and then widely employed in [21][22][23][24]. So, the density of hybrid nanofluid is specified by…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…Equation (6) that is utilized for specifying heat capacity was first employed in [20] and then used in many articles [22,23,25]:…”

Section: Mathematical Modelingmentioning

confidence: 99%

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Augmentation of the Heat Transfer Performance of a Sinusoidal Corrugated Enclosure by Employing Hybrid Nanofluid

Takabi

Salehi

2014

Advances in Mechanical Engineering

416

230

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This paper numerically examines laminar natural convection in a sinusoidal corrugated enclosure with a discrete heat source on the bottom wall, filled by pure water, Al 2 O 3 /water nanofluid, and Al 2 O 3 -Cu/water hybrid nanofluid which is a new advanced nanofluid with two kinds of nanoparticle materials. The effects of Rayleigh number (10 3 ≤ Ra ≤ 10 6 ) and water, nanofluid, and hybrid nanofluid (in volume concentration of 0% ≤ ≤ 2%) as the working fluid on temperature fields and heat transfer performance of the enclosure are investigated. The finite volume discretization method is employed to solve the set of governing equations. The results indicate that for all Rayleigh numbers been studied, employing hybrid nanofluid improves the heat transfer rate compared to nanofluid and water, which results in a better cooling performance of the enclosure and lower temperature of the heated surface. The rate of this enhancement is considerably more at higher values of Ra and volume concentrations. Furthermore, by applying the modeling results, two correlations are developed to estimate the average Nusselt number. The results reveal that the modeling data are in very good agreement with the predicted data. The maximum error for nanofluid and hybrid nanofluid was around 11% and 12%, respectively.

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The effects of the use of hybrid and mono nanofluids on thermal performance in flat‐plate solar collectors

Yurddaş

Çerçi

Çavdar

et al. 2021

Environ Prog Sustainable Energy

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Since considerable amount of energy is spent in water heating processes in the world, solar energy systems are of great importance while heating water. Amongst these systems, flat-plate solar collector systems have an extensive area of use in residences. Therefore, nanofluid system has been investigated in order to enhance the efficiency in water heating through flat plate solar collectors and to benefit from solar energy more effectively. A simplified model has been taken into consideration to design the model of this system and complete the analyzes more rapidly. To identify the accurateness of the model, comparisons have been made against an experimental and a numerical study; and, a decent convergence to the experimental data has been obtained. Nanofluids used in the system have been applied in hybrid structure. The analysis has been conducted for the case of that two different nanometer-sized metal nanoparticles (SiO 2 and Cu) are mixed in water-based base fluid with different volume concentrations. Influences of nanofluids in different volume fractions on thermal performance have been investigated and compared against water and each other. In the system having 30 angle, diversified flow rates and heat fluxes have also been evaluated. It is concluded that water-based nanofluids enhances thermal performance; and, amongst these, the nanofluid including Cu nanoparticles augments thermal performance much better. To avoid precipitation problems within the system, thermal performance has been increased by virtue of using nanofluids with lower volumetric concentrations in hybrid form by adding certain amount of Cu nanoparticle instead of using high volumetric concentrations of SiO 2 nanoparticles. In comparison to water, these nanofluids we utilized have increased thermal performance in the rates of 2.03% (2%SiO 2 + 1%Cu-H 2 O), 3.218% (1%SiO 2 + 2%Cu-H 2 O), 0.943% (3%SiO 2 -H 2 O), 4.076% (3%Cu-H 2 O), 4.083% (3%SiO 2 + 2%Cu-H 2 O), 4.935% (2%SiO 2 + 3%Cu-H 2 O), 1.569% (5%SiO 2 -H 2 O), and 6.508% (5%Cu-H 2 O).

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Numerical investigation on nanofluids turbulent convection heat transfer inside a circular tube

Cited by 215 publications

References 30 publications

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

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

Augmentation of the Heat Transfer Performance of a Sinusoidal Corrugated Enclosure by Employing Hybrid Nanofluid

The effects of the use of hybrid and mono nanofluids on thermal performance in flat‐plate solar collectors

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