Investigation of thermal conductivity and viscosity of Fe3O4 nanofluid for heat transfer applications

Sundar, L. Syam; Singh, Manoj K.; Sousa, António C.M.

doi:10.1016/j.icheatmasstransfer.2013.02.014

Cited by 398 publications

(161 citation statements)

References 40 publications

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“…Previous works involving enhanced thermal conductivity of water usually comprises addition of CuO, [20][21][22] Al 2 O 3 6,22-24 and iron oxide 25,26 to water and all agreed on enhancement in thermal conductivity upon addition of NPs.…”

Section: Deterioration In Relative Thermal Conductivity Of Ag/w-dw Namentioning

confidence: 99%

The effect of functionalized silver nanoparticles over the thermal conductivity of base fluids

et al. 2017

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Thermal conductivities of nanofluids are expected to be higher than common heat transfer fluids. The use of metal nanoparticles has not been intensely investigated for heat transfer applications due to lack of stability. Here we present an experimental study on the effect of silver nanoparticles (Ag NPs) which are stabilized with surfactants, on the thermal conductivity of water, ethylene glycol and hexane. Hydrophilic Ag NPs were synthesized in aqueous medium with using gum arabic as surfactant and oleic acid/oleylamine were used to stabilize Ag NPs in the organic phase. The enhancement up to 10 per cent in effective thermal conductivity of hexane and ethylene glycol was achieved with addition of Ag NPs at considerably low concentrations (i.e. 2 and 1 per cent, by weight, for hexane and ethylene glycol respectively). However, almost 10 per cent of deterioration was recorded at effective thermal conductivity of water when Ag NPs were added at 1 per cent (by wt). Considerable amount of Gum Arabic in the medium is shown to be the major contributor to this fall, causing lowering of thermal conductivity of water. Same particles performed much better in ethylene glycol where the stabilizer does not lower the thermal conductivity of the base fluid. Also thermal conductivity of nanofluids was found to be temperature independent except water based Ag nanofluids above a threshold concentration. This temperature dependency is suggested to be due to inhibition of hydrogen bonding among water molecules in the presence of high amounts of gum arabic.

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Section: Deterioration In Relative Thermal Conductivity Of Ag/w-dw Namentioning

confidence: 99%

The effect of functionalized silver nanoparticles over the thermal conductivity of base fluids

et al. 2017

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“…They found that viscosity decreased with an increase in temperature. Sundar et al [58] investigated the viscosity of magnetic Fe 3 O 4 -water nanofluid within a temperature range of 20-60°C. They found a decrease in viscosity as the temperature increased.…”

Section: Effect Of Temperaturementioning

confidence: 99%

A brief review on viscosity of nanofluids

et al. 2014

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Since the past decade, rapid development in nanotechnology has produced several aspects for the scientists and technologists to look into. Nanofluid is one of the incredible outcomes of such advancement. Nanofluids (colloidal suspensions of metallic and nonmetallic nanoparticles in conventional base fluids) are best known for their remarkable change to enhanced heat transfer abilities. Earlier research work has already acutely focused on thermal conductivity of nanofluids. However, viscosity is another important property that needs the same attention due to its very crucial impact on heat transfer. Therefore, viscosity of nanofluids should be thoroughly investigated before use for practical heat transfer applications. In this contribution, a brief review on theoretical models is presented precisely. Furthermore, the effects of nanoparticles' shape and size, temperature, volume concentration, pH, etc. are organized together and reviewed.

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“…[2][3][4][5] It was shown by several studies that thermal conductivity of nanoparticle-based fluid systems increases with increasing particle volume concentrations regardless of the nanoparticle used. 2,3,5-10 The enhancement of thermal conductivity was also shown to depend on particle morphology, 11 particle size, [12][13][14][15][16] temperature, 4,12,17 particle type 18 and corresponding base fluid, [19][20][21] etc. Brownian motion and aggregation which improves the thermal transport were claimed to be the reasons of enhanced thermal conductivity of these nanofluid systems.…”

Section: Introductionmentioning

confidence: 99%

“…Their results showed that the thermal conductivity of magnetite based nanofluid increased with increasing particle concentration and temperature, which was attributed to the Brownian motion of the particles. 20,32 Abareshi et al 33 synthesized magnetite nanoparticles via a co-precipitation method and used tetramethyl ammonium hydroxide to obtain stability in aqueous medium. They showed an increase in thermal conductivity with increasing volume fraction and obtained an enhancement of up to 11.5% at 3 vol.…”

Section: Introductionmentioning

confidence: 99%

Deterioration in effective thermal conductivity of aqueous magnetic nanofluids

Altan

Gurten²,

Sommerdijk

et al. 2014

Journal of Applied Physics

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Common heat transfer fluids have low thermal conductivities, which decrease their efficiency in many applications. On the other hand, solids have much higher thermal conductivity values. Previously, it was shown that the addition of different nanoparticles to various base fluids increases the thermal conductivity of the carrier fluid remarkably. However, there are limited studies that focus on the thermal conductivity of magnetic fluids. In this study, thermal conductivity of magnetic nanofluids composed of magnetite nanoparticles synthesized via co-precipitation and thermal decomposition methods is investigated. Results showed that the addition of magnetite nanoparticles decreased the thermal conductivity of water and ethylene glycol. This decrease was found to increase with increasing particle concentration and to be independent of the synthesis method, the type of surfactant, and the interfacial thermal resistance. V C 2014 AIP Publishing LLC.

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Investigation of thermal conductivity and viscosity of Fe3O4 nanofluid for heat transfer applications

Cited by 398 publications

References 40 publications

The effect of functionalized silver nanoparticles over the thermal conductivity of base fluids

The effect of functionalized silver nanoparticles over the thermal conductivity of base fluids

A brief review on viscosity of nanofluids

Deterioration in effective thermal conductivity of aqueous magnetic nanofluids

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