Synthesis of Al2O3–Cu/water hybrid nanofluids using two step method and its thermo physical properties

Suresh, S.; Venkitaraj, K.P.; Selvakumar, P.; Chandrasekar, M.

doi:10.1016/j.colsurfa.2011.08.005

Cited by 869 publications

(401 citation statements)

References 22 publications

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“…where q is constant heat rate applied to an infinitely long and small line source, DT 1 and DT 2 are the changes in the temperature at times t 1 and t 2 , respectively (Suresh et al 2011). The calibration of the sensor needle was carried out first by measuring thermal conductivity of distilled water.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Preparation and characterization of copper oxide nanofluid for heat transfer applications

et al. 2013

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Copper oxide nanofluid has been prepared by single-step wet chemical precipitation method. The preparation of nanofluid is carried out by reducing copper chloride with sodium hydroxide as reducing agent in deionised water as base fluid by means of conventional heating. The characterization of sample nano powder is done by X-ray diffraction (XRD), EDXA, SEM, and TGA. The mean size of the particle was determined from the XRD pattern by using the Scherrer formula and the average particle size was found to be 20 nm. Also an increase in thermal conductivity of the prepared copper oxide nanofluid was found to be 12.4 % compared to deionised water.

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Section: Thermal Conductivitymentioning

confidence: 99%

Preparation and characterization of copper oxide nanofluid for heat transfer applications

et al. 2013

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“…It is noteworthy to say that Relations (4) and (5) are derived from an experimental model [18]. In order to correlate these relations, two graphs are tted to the experimental data, which is illustrated in Figure 2.…”

Section: Problem Formulationmentioning

confidence: 99%

“…The hybrid nano uid density [31,32], heat capacity [32,33] electrical conductivity [34,35], viscosity, and thermal conductivity [18] are obtained from the following relations, respectively: …”

Section: Problem Formulationmentioning

confidence: 99%

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Analytical study of Al2O3-Cu/water micropolar hybrid nanofluid in a porous channel with expanding/contracting walls in the presence of magnetic field

2017

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Abstract. Forced convection uid ow and heat transfer were investigated in a porous channel with expanding or contracting walls, which was lled with Al2O3-Cu/water micropolar hybrid nano uid in the presence of magnetic eld. In order to solve the governing equations analytically, the least square method was employed. The hot bottom wall was cooled by the coolant uid, which was injected into the channel from the top wall. The range of nanoparticles volume fraction (90% Al 2 O 3 and 10% Cu by volume) was between 0% and 2%. The e ects of consequential parameters such as Reynolds number, Hartmann number, micro rotation factor, and nanoparticles volume fraction on velocity and temperature pro les were examined. The results show that with increasing Reynolds number, the values of temperature and micro rotation pro les decrease. Furthermore, when the hybrid nano uid is used, compared to common nano uid, the heat transfer coe cient will increase signi cantly. It is also observed that when the Hartmann number increases, Nusselt number increases, too.

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“…Researchers have very recently discovered a new way of synthesizing metallic nanoparticles that overcomes weaknesses such as low stability. Suresh et al (2011) recently added Cu nanoparticles to Al 2 O 3 nanoparticles and synthesized the mixture through a twostep thermomechanical method. The stability of the mixture was improved by adding alumina, a ceramic material, to the metallic copper nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Effect of heating rate and plant species on the size and uniformity of silver nanoparticles synthesized using aromatic plant extracts

et al. 2016

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Mixing aqueous silver solutions with aqueous leaf aromatic plant extracts from basil, mint, marjoram and peppermint resulted in the synthesis of quasi-spherical silver nanoparticles in a range of size between 2 and 80 nm in diameter as analyzed by analytical high-resolution electron microscopy. The average size could be controlled by applying heat to the initial reaction system at different rates of heating, and by the specific botanical species employed for the reaction. Increasing the rate of heating resulted in a statistically significant decrease in the size of the nanoparticles produced, regardless of the species employed. This fact was more evident in the case of marjoram, which decreased the average diameter from 27 nm at a slow rate of heating to 8 nm at a high rate of heating. With regard to the species, minimum sizes of \10 nm were obtained with basil and peppermint, while marjoram and mint yielded an average size between 10 and 25 nm. The results indicate that aromatic plant extracts can be used to achieve the controlled synthesis of metal nanoparticles.

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Synthesis of Al2O3–Cu/water hybrid nanofluids using two step method and its thermo physical properties

Cited by 869 publications

References 22 publications

Preparation and characterization of copper oxide nanofluid for heat transfer applications

Preparation and characterization of copper oxide nanofluid for heat transfer applications

Analytical study of Al2O3-Cu/water micropolar hybrid nanofluid in a porous channel with expanding/contracting walls in the presence of magnetic field

Effect of heating rate and plant species on the size and uniformity of silver nanoparticles synthesized using aromatic plant extracts

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