A review on natural convective heat transfer of nanofluids

Haddad, Zoubida; Öztop, Hakan F.; Abu‐Nada, Eiyad; Mataoui, Amina

doi:10.1016/j.rser.2012.04.003

Cited by 265 publications

(114 citation statements)

References 86 publications

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“…where the nanofluid effective density, heat capacity, thermal expansion coefficient and thermal diffusivity are calculated from the following equations (Corcione, (2010) and Haddad et al, (2012)):…”

Section: Mathematical Formulationmentioning

confidence: 99%

Modeling of Free Convection Heat Transfer Enhancement Utilizing Nanofluid Inside a Wavy Wal Enclosure With a Pair of Hot and Cold Cylinders

Boulahia¹,

Wakif²,

Sehaqui³

2017

Frontiers in Heat and Mass Transfer

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In the present work, natural convection heat transfer of Cu-water nanofluid inside a wavy wall enclosure is investigated numerically by using the finite volume discretization method. The study examines the effect of the nanoparticle volume fraction, the Rayleigh number, the wave amplitude, and the undulations number on the heat transfer rate. The results show that the heat transfer rate inside the wavy enclosure enhances by decreasing the wavy surface amplitude and increasing undulations number. It is also found that by increasing the volume fraction of nanoparticles and Rayleigh number, the heat transfer rate increases.Keywords: Wavy Enclosure, Natural Convection, Nanofluid, Undulation, amplitude, circular Cylinder INTRODUCTIONNatural convection fluid flow and heat transfer inside a wavy enclosure is found in many engineering applications, such as industrial heat radiators, heat exchanger design, cooling of micro-electronic devices, solar collector, and double-wall thermal insulation. The heat transfer inside a wavy enclosure has not been investigated widely due to the complexity of the geometry. Natural convection in a wavy enclosures show enhanced heat transfer when compared to the corresponding enclosure with flat walls (Abu-Nada and Oztop, (2011)). Thus, the study of fluid flow and heat transfer within wavy-walled enclosures is useful for many engineering problems related to geometrical design requirements. One of the first works on the numerical simulation of natural convection inside cavities is the pioneering work of De Vahl Davis, (1983). He performed a numerical simulation on a square cavity with two vertical isothermal walls, one cold and one hot, and two horizontal adiabatic walls. This cavity with those boundary conditions is known as differentially heated cavity (DHC). Boulahia et al., (2016) analyzed the natural convection in a wavy bottom walled shallow enclosure without internal heat generation. They found that the heat transfer was increased with decreasing values of the non-dimensional wave length whereas it increased with increasing values of the aspect ratio and the Rayleigh number. Other examples can be found in reference Das and Mahmud, (2003). The aim of this study is to explore the heat transfer rate of natural convection heat transfer of nanofluid (Cu-water) in a wavy-wall enclosure. The first case under investigation is characterized the numerical models used in our study. The computational procedure elaborated in this study is validated against the numerical results of other investigations. We studied the effects wave amplitude a (from 0.05 to 0.2) and undulations number (from 1 to 3) on the heat transfer rate. Wide range of parameters such as Rayleigh number 10 10 , and volume fraction of nanoparticles 0 0.05 have been used. The new models of the thermal conductivity and effective viscosity investigated by Corcione, (2011) are used to estimate themophysical proprieties of the nanofluid. Our numerical results are presented in the form of plots of isotherms, streamlines and ave...

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Section: Mathematical Formulationmentioning

confidence: 99%

Modeling of Free Convection Heat Transfer Enhancement Utilizing Nanofluid Inside a Wavy Wal Enclosure With a Pair of Hot and Cold Cylinders

Boulahia¹,

Wakif²,

Sehaqui³

2017

Frontiers in Heat and Mass Transfer

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“…In an attempt to improve the heat transfer performance, Choi (1995) dispersed metallic nanoparticles with a high thermal conductivity in traditional working fluids to form so-called nanofluids. Many subsequent studies have shown that nanofluids yield a significant improvement in the heat transfer performance in a diverse range of engineering fields (Das et al, 2006;Wang et al, 2007;Yu et al, 2008;Kakac et al, 2009;Haddad et al, 2012). Said Bouchta, M'barek Feddaoui, and Hossine El Ihssini / American Journal of Heat and Mass Transfer (2017) Vol.…”

Section: Introductionmentioning

confidence: 99%

Natural Convection in a Square Cavity Containing a Nanofluid and a Partially-heated Square Block at the Centre

Bouchta¹,

Feddaoui²,

Ihssini³

2017

AJHMT

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This work focuses on the numerical study of natural convection fluid flow and heat transfer of (Cu, Al2O3 and TiO2)-water nanofluids in the annuli of two partially-heated square ducts. The left and right vertical walls of the outer duct have constant but different temperatures Th and Tc respectively, while the inner duct is maintained at the same and opposite temperatures. The ducts top and bottom walls are kept insulated. The governing equations are solved numerically using the finite-volume method. The SIMPLEC algorithm was employed to couple velocity and pressure fields. Using the developed in house code, the effects of pertinent parameters such as the Rayleigh number, volume fraction of nanoparticles and aspect ratio on the fluid flow and heat transfer inside the cavity were investigated. It is observed from the results that the average Nusselt number increases when both the Rayleigh number and the volume fraction of the nanoparticles increase. Moreover, heat transfer in nanofluid with Cu nanoparticles is much better than Al2O3 and TiO2 nanoparticles.

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“…Buoyancy driven heat transfer of nanofluids in C-shaped enclosures was analyzed by Mahmoodi (2012). Several other studies have been performed and are listed by Zoubida (2012).…”

Section: Introductionmentioning

confidence: 99%

Natural Convection of Nanofluids in Inclined E-Shaped Enclosures

Vyas¹

2017

AJHMT

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The present work introduces the use of E-shaped enclosure for heat transfer applications. Natural convection of different nanofluids in E-shaped enclosure inclined at different angles is analyzed for a range of Rayleigh numbers. Taking water as base fluid, enhancement in heat transfer by addition of Cu, Al2O3 and TiO2 nanoparticles is compared. The governing equations are discretized using finite volume method using a uniform collocated grid. SIMPLE algorithm with modified Rhie-Chow interpolation is used for pressure velocity coupling. The impact of addition of nanoparticles is analyzed by evaluating the average Nusselt number which is observed to increase considerably by addition of nanoparticles to the base fluid. The maximum enhancement is observed in the case wherein Cu nanoparticles are used. A significant variation of flow patterns is observed for different values of the inclination angle at different Rayleigh numbers and the effect of this on heat transfer characteristics is evaluated.Keywords: Nanofluid; Natural Convection; E-shape; Rayleigh-Benard convectionDimensional velocity components in x and y direction (m/s) U, V Non-Dimensional velocity components in X and Y direction p Pressure (N/m 2 ) P Non-Dimensional Pressure

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A review on natural convective heat transfer of nanofluids

Cited by 265 publications

References 86 publications

Modeling of Free Convection Heat Transfer Enhancement Utilizing Nanofluid Inside a Wavy Wal Enclosure With a Pair of Hot and Cold Cylinders

Modeling of Free Convection Heat Transfer Enhancement Utilizing Nanofluid Inside a Wavy Wal Enclosure With a Pair of Hot and Cold Cylinders

Natural Convection in a Square Cavity Containing a Nanofluid and a Partially-heated Square Block at the Centre

Natural Convection of Nanofluids in Inclined E-Shaped Enclosures

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