Natural convection of silica–water nanofluids based on experimental measured thermophysical properties: critical analysis

Haddad, Zoubida; Abid, C.; Mohamad, A. A.; Rahli, Ouamar; Bawazer, S.

doi:10.1007/s00231-015-1682-4

Cited by 17 publications

(9 citation statements)

References 55 publications

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“…Haddad et al (2014) compared the results of measured data and theoretical models for thermophysical properties of SiO 2 – water nano liquids in a heat exchanger for 10 4 < Ra < 10 6 . They mentioned that at higher Ra, the heat transfer illustrates a descending trend when measured data for properties are used.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional modelling of natural convection and entropy generation in a vertical cylinder under heterogeneous heat flux using nanofluids

Rashidi

Kolsi

Ahmadi

et al. 2019

HFF

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Purpose This study aims to investigate a three-dimensional computational modelling of free convection of Al2O3 water-based nanofluid in a cylindrical cavity under heterogeneous heat fluxes that can be used as a thermal storage tank. Design/methodology/approach Effects of different heat flux boundary conditions on heat transfer and entropy generation were examined and the optimal configuration was identified. The simulation results for nanoparticle (NP) volume fractions up to 4 per cent, and Rayleigh numbers of 104, 105 and 106 were presented. Findings The results showed that for low Ra (104) the heat transfer and entropy generation patterns were symmetric, whereas with increasing the Rayleigh number these patterns became asymmetric and more complex. Therefore, despite the symmetric boundary conditions imposed on the periphery of the enclosure (uniform in Ɵ), it was necessary to simulate the problem as three-dimensional instead of two-dimensional. The simulation results showed that by selecting the optimal values of heat flux distribution and NP volume fraction for these systems the energy consumption can be reduced, and consequently, the energy efficiency can be ameliorated. Originality/value The results of the present study can be used for the design of energy devices such as thermal storage tanks, as both first and second laws of thermodynamics have been considered. Using the optimal design will reduce energy consumption.

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Section: Introductionmentioning

confidence: 99%

Three-dimensional modelling of natural convection and entropy generation in a vertical cylinder under heterogeneous heat flux using nanofluids

Rashidi

Kolsi

Ahmadi

et al. 2019

HFF

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“…Wen and Ding (2005a) also found a decrease of natural convective HTC of TiO 2 (30-40 nm) water nanofluids in a vessel as compared to that of pure water. Haddad et al (2016) studied natural convection of SiO 2 (20 nm)-water nanofluid in an enclosure and found that uncertainties in the predictive models for the effective thermal conductivity and dynamic viscosity of nanofluids leads to erroneous evaluation of the convective heat transfer with nanofluids. The heat transfer across the enclosure using different models can be enhanced or deteriorated with respect to the base fluid.…”

Section: Heat Transfer Characteristicsmentioning

confidence: 99%

A Review on Heat Transfer Enhancement With Nanofluids

Guo

2020

J Enh Heat Transf

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Advances in technology miniaturization with increasing power density call for new technologies for enhancing heat transfer. Enhancement of heat transfer with the use of nanofluids has been a hectic topic of research and development since the term "nanofluid" was first used in 1995, mainly because the thermophysical properties of nanofluids in most reports in the literature showed supremacy or improvement over their base fluids, which may not allow fulfillment of the present cutting-edge technology needs. Significant progress in this field has been made in the past two decades. This review summarizes a variety of the experimentally measured thermal properties of common nanofluids, the enhancement mechanisms discovered or hypothesised, the models used for properties and heat transfer characteristics, and the applications of nanofluids for enhancing heat transfer. The model of an artificial neutral network is particularly emphasized. Applications to cooling technology, renewable energy and energy systems, and building technology are detailed. Challenges and areas for future research are identified.

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“…In recent years, heat transfer of nanofluid in cavities with various boundary conditions has been investigated. For instance, natural convection of Nanofluid in cavities with different boundary condition and boundary shapes in presence of various barriers inside the cavity has been numerously studied …”

Section: Introductionmentioning

confidence: 99%

“…For instance, natural convection of Nanofluid in cavities with different boundary condition and boundary shapes in presence of various barriers inside the cavity has been numerously studied. [19][20][21][22][23][24][25][26][27][28] Furthermore, mixed convection of Newtonian nanofluid flow in cavities with a different structure of the cavity has been considered by many researchers. [29][30][31][32][33][34][35][36] In some special cases, mixed convection heat transfer in lid-driven rectangular enclosures with an effect of different aspect ratio has been considered.…”

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confidence: 99%

Numerical investigation of non‐Newtonian nanofluid mixed convection in a two‐opposite direction lid‐driven cavity with variable properties

Nazari

Akbari

2018

Heat Trans. Asian Res.

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The mixed convection fluid flow in a square cavity filled with AL2O3‐water non‐Newtonian nanofluid is numerically analyzed. The left and right vertical boundaries of the enclosure have been kept in the constant temperature. Remaining walls of the cavity have been considered to have adiabatic boundary condition. Two different cases have been considered. In the first case, left and right side walls have been moved vertically with constant speed Vb in opposite directions. In the second case, the directions of their motions have been reversed. The transport equations, written in terms of the primitive variables for the non‐Newtonian nanofluid, have been solved numerically using the finite volume method. The shear stresses were calculated using the Ostwald‐de Waele model for the shear‐thinning nanofluid. The model introduced by Patel et al was used to obtain the thermal conductivity of the nanofluid. The variation of the fluid flow with respect to the Richardson number and volume fraction of the nanoparticles was investigated through a parametric study. Even though increasing the volume fraction of nanoparticles leads to heat transfer enhancement, for the second case of this study, for Ri = 1, the average Nusselt number initially drops sharply by increasing the volume fraction of nanoparticles, then remains constant.

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Natural convection of silica–water nanofluids based on experimental measured thermophysical properties: critical analysis

Cited by 17 publications

References 55 publications

Three-dimensional modelling of natural convection and entropy generation in a vertical cylinder under heterogeneous heat flux using nanofluids

Three-dimensional modelling of natural convection and entropy generation in a vertical cylinder under heterogeneous heat flux using nanofluids

A Review on Heat Transfer Enhancement With Nanofluids

Numerical investigation of non‐Newtonian nanofluid mixed convection in a two‐opposite direction lid‐driven cavity with variable properties

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