Synthesis and viscosity studies of novel ecofriendly ZnO–coconut oil nanofluid

Rashin, M. Nabeel; Hemalatha, J.

doi:10.1016/j.expthermflusci.2013.08.014

Cited by 63 publications

(8 citation statements)

References 23 publications

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“…6 represents the dependence of viscosity enhancement ratio on temperature for differ nanoparticles concentrations. As can be seen, deterioration of viscosity with temperature obvious, which is in accordance with earlier works 2,21 . Noticeably, viscosity of nanofluids relatively higher than that measured for the base fluid.…”

Section: Boiling Thermal Performancesupporting

confidence: 79%

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Thermal Performance and Viscosity of Biologically Produced Silver/Coconut Oil Nanofluids

Sarafraz¹

2017

Chem.Biochem.Eng.Q.

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In this work, thermal conductivity, viscosity, and boiling heat transfer coefficient of a biologically produced nano-coolant were experimentally quantified. The nanoparticles were produced from silver nitrate via the plant extraction method and by means of green tea leaf extract. The mean size of the particles was 50 nm, with spherical morphology and single-phase structure of Ag (silver). The synthesized particles were dispersed in coconut oil as base fluid. Thermal conductivity and viscosity of the nanofluid were experimentally measured and correlated based on temperature and concentration of nanoparticles via the regression analysis. Thermal performance of the nanofluid inside an annular heat exchanger with convective boiling conditions (in forced convection and nucleate boiling heat transfer regimes) was assessed. The results demonstrated a superior thermal performance in both heat transfer regions over the base oil, and revealed that this nanofluid can be used as a coolant as well as a lubricant in engines with high heat flux conditions, as its thermal conductivity and viscosity were enhanced due to the presence of Ag particles inside the oil.

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Section: Boiling Thermal Performancesupporting

confidence: 79%

“…water or oil). A very small amount of nanoparticles can provide dramatic improvements in thermal properties of a base fluid [2][3][4][5][6][7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance and Viscosity of Biologically Produced Silver/Coconut Oil Nanofluids

Sarafraz¹

2017

Chem.Biochem.Eng.Q.

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“…At low shear rates, as the spindle rotates in the fluid, the structure of the fluid molecules changes temporarily and gradually aligns themselves in the direction of increasing shear; it produces less resistance and hence a reduction in viscosity. When the shear rate is high enough, the maximum amount of possible shear ordering is attained, and the aggregates are broken down to smaller sizes, decreasing the friction and hence the viscosity [ 30 ]. If we increase the shear rate further, it will not make any alteration on the viscosity.…”

Section: Resultsmentioning

confidence: 99%

Investigation of thermal conductivity and rheological properties of nanofluids containing graphene nanoplatelets

et al. 2014

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In the present study, stable homogeneous graphene nanoplatelet (GNP) nanofluids were prepared without any surfactant by high-power ultrasonic (probe) dispersion of GNPs in distilled water. The concentrations of nanofluids were maintained at 0.025, 0.05, 0.075, and 0.1 wt.% for three different specific surface areas of 300, 500, and 750 m2/g. Transmission electron microscopy image shows that the suspensions are homogeneous and most of the materials have been well dispersed. The stability of nanofluid was investigated using a UV-visible spectrophotometer in a time span of 600 h, and zeta potential after dispersion had been investigated to elucidate its role on dispersion characteristics. The rheological properties of GNP nanofluids approach Newtonian and non-Newtonian behaviors where viscosity decreases linearly with the rise of temperature. The thermal conductivity results show that the dispersed nanoparticles can always enhance the thermal conductivity of the base fluid, and the highest enhancement was obtained to be 27.64% in the concentration of 0.1 wt.% of GNPs with a specific surface area of 750 m2/g. Electrical conductivity of the GNP nanofluids shows a significant enhancement by dispersion of GNPs in distilled water. This novel type of nanofluids shows outstanding potential for replacements as advanced heat transfer fluids in medium temperature applications including solar collectors and heat exchanger systems.

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“…It can maintain good dispersion stability even under the influence of external fields, such as centrifugal and magnetic fields. 2 Coconut oil has admirable biodegradability, environment friendliness, and nontoxicity, 19,20 which makes it a suitable base fluid for ecofriendly oil removal. The present study encompasses the synthesis of stable magnetite−coconut oil nanofluid, and its utility as an ecofriendly oil spill remover.…”

Section: Introductionmentioning

confidence: 99%

Novel Coconut Oil Based Magnetite Nanofluid as an Ecofriendly Oil Spill Remover

Rashin

Kutty

Hemalatha

2014

Ind. Eng. Chem. Res.

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The removal of oil spills from a water surface has huge industrial importance, in view of ecological safety. A novel, ecofriendly coconut oil based magnetite nanofluid is prepared by the coprecipitation method, for removing oil contaminants from water. Magnetic particles with face centered cubic crystal structure and superparamagnetic behavior are prepared and used to get a stable suspension in coconut oil. The superhydrophobicity and superoleophilicity of the nanofluid are examined through contact angle measurements. The fluid offers a contact angle of 166° which is greater than the critical angle of 150°, indicating its superhydrophobic nature. This paper demonstrates the usage of the magnetite–coconut oil nanofluid in the removal of an oil spill from water with 91% efficiency. The mechanism is based on the selective absorbance property of superhydrophobic and superoleophilic nanofluids, which can collect contaminant oil while completely repelling the water molecules. When magnetic nanofluid is added to oil contaminated water, the nonpolar hydrophobic part of the contaminant oil gets attached to the carrier fluid (coconut oil) through London dispersive forces; this is then collected along with the magnetic nanofluid, by applying a magnetic field. The proposed method is an efficient biocompatible one that can be used on a large scale, for the cleanup of oil spills on water surfaces.

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Synthesis and viscosity studies of novel ecofriendly ZnO–coconut oil nanofluid

Cited by 63 publications

References 23 publications

Thermal Performance and Viscosity of Biologically Produced Silver/Coconut Oil Nanofluids

Thermal Performance and Viscosity of Biologically Produced Silver/Coconut Oil Nanofluids

Investigation of thermal conductivity and rheological properties of nanofluids containing graphene nanoplatelets

Novel Coconut Oil Based Magnetite Nanofluid as an Ecofriendly Oil Spill Remover

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