Role of interfacial layer and clustering on the effective thermal conductivity of CuO–gear oil nanofluids

Kole, Madhusree; Dey, T.K.

doi:10.1016/j.expthermflusci.2011.06.010

Cited by 101 publications

(46 citation statements)

References 50 publications

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“…It was also reported that 5% volume fraction of TiO2 nanoparticles and 7.5% of volume fraction of CuO enhanced thermal conductivity of water by 33% and 32%, respectively [20,21], whereas 5% volume of ZnO enhanced thermal conductivity of water by 12% [22]. So far, several mechanisms of thermal conductivity enhancement of nanofluids has been proposed, such as the Brownian motion of nanoparticles [23], molecular-level layering of the liquid at the liquid particle interface [24], the nature of heat transport in the nanoparticles, and the effect of nanoparticle clustering [25].…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity and Specific Heat Capacity of Dodecylbenzenesulfonic Acid-Doped Polyaniline Particles—Water Based Nanofluid

2015

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Nanofluid has attracted great attention due to its superior thermal properties. In this study, chemical oxidative polymerization of aniline was carried out in the presence of dodecylbenzenesulfonic acid (DBSA) as a dopant. Particles of DBSA-doped polyaniline (DBSA-doped PANI) with the size range of 15 to 50 nm were obtained, as indicated by transmission electron microscope (TEM). Results of ultra violet-visible (UV-Vis) absorption and Fourier transform infrared (FTIR) spectroscopies as well as thermogravimetric analysis showed that PANI nanoparticles were doped with DBSA molecules. The doping level found was 36.8%, as calculated from elemental analysis data. Thermal conductivity of water was enhanced by 5.4% when dispersed with 1.0 wt% of DBSA-PANI nanoparticles. Specific heat capacity of water-based nanofluids decreased with increasing amount of DBSA-PANI nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Thermal Conductivity and Specific Heat Capacity of Dodecylbenzenesulfonic Acid-Doped Polyaniline Particles—Water Based Nanofluid

2015

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“…Substitution of relation (16) in (1) closes the problem of determining the effective thermal conductivity of the nanofluid.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…There has been recently much attention paid to some particular heat transfer mechanisms in nanofluids, such as formation of a nano-liquid-layer around the nanoparticles (liquid layering) [13][14][15][16], particles clustering [17][18][19][20] and Brownian motion of particles [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

The role of several heat transfer mechanisms on the enhancement of thermal conductivity in nanofluids

Machrafi

Lebon

2016

Continuum Mech. Thermodyn.

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A modelling of the thermal conductivity of nanofluids based on extended irreversible thermodynamics is proposed with emphasis on the role of several coupled heat transfer mechanisms: liquid interfacial layering between nanoparticles and base fluid, particles agglomeration and Brownian motion. The relative importance of each specific mechanism on the enhancement of the effective thermal conductivity is examined. It is shown that sizes of the nanoparticles and the liquid boundary layer around the particles play a determining role. For nanoparticles close to molecular range, the Brownian effect is important. At nanoparticles of the order of 1-100 nm, both agglomeration and liquid layering are influent. Agglomeration becomes the most important mechanism at nanoparticle sizes of the order of 100 nm and higher.The theoretical considerations are illustrated by three case-studies: suspensions of alumina rigid spherical nanoparticles in water, ethylene glycol and a 50/50 w% water/ethylene-glycol mixture, respectively, good agreement with experimental data is observed.

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“…The liquid molecules close to the nanoparticles form a nanolayer which functions as a bridge linking the additional nanoparticles and the liquid molecules, thus causing the increase of thermal conductivity [5]. Moreover, Keblinski presented a ballistic phonon transport theory that the ballistic phonons originated in one particle can spread to an adjacent particle and contribute to the remarkable enhancement much compared to Brownian motion even at extremely low mass fraction [6].…”

Section: Effect On Thermal Conductivitymentioning

confidence: 99%

Investigating the Influence of Different Types of Nanoparticles on Thermal and Dielectric Properties of Insulation in Converter Transformer

Du¹

2017

Properties and Applications of Polymer Dielectrics

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Converter transformer is the extraordinarily vital apparatus in the high-voltage direct current (HVDC). Transformer oil and oil-impregnated paper are considered as the essential parts of converter transformer, which has suffered various complex electric fields such as AC/DC composite electric field and polarity reversal. The occurrence of discharge or insulation failure in oil-paper insulation system will threaten the safety of the entire grid. Hence, efforts should be focused on investigating the charge behavior and improving the property of dielectric.This chapter presents a study aimed at investigating the influence of different types of nanoparticles on thermal and dielectric properties along with the relation between them and the effects of switching overvoltage on the charge coupling behavior of oil-impregnated paper, and the surface charge behavior on double-layer oil-paper insulation under pulse voltage is investigated.

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Role of interfacial layer and clustering on the effective thermal conductivity of CuO–gear oil nanofluids

Cited by 101 publications

References 50 publications

Thermal Conductivity and Specific Heat Capacity of Dodecylbenzenesulfonic Acid-Doped Polyaniline Particles—Water Based Nanofluid

Thermal Conductivity and Specific Heat Capacity of Dodecylbenzenesulfonic Acid-Doped Polyaniline Particles—Water Based Nanofluid

The role of several heat transfer mechanisms on the enhancement of thermal conductivity in nanofluids

Investigating the Influence of Different Types of Nanoparticles on Thermal and Dielectric Properties of Insulation in Converter Transformer

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