Thermo-physical properties of pure ethylene glycol and water–ethylene glycol mixture-based boron nitride nanofluids

Michael, Monisha; Zagabathuni, Aparna; Ghosh, Sudipto; Pabi, S.K.

doi:10.1007/s10973-018-7965-5

Cited by 19 publications

(9 citation statements)

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“…Such shear thinning behavior possibly arises from the alignment of the nanoparticle clusters in the flow direction taking place with the increasing shear rate, thereby resulting in an initial decrease in viscosity. Other researchers have also observed similar behaviour [27] [17]. A constant viscosity is observed for shear rate beyond 24.5 s −1 .…”

Section: Resultssupporting

confidence: 74%

“…Ilhan et al [16] also analyzed the heat transfer properties of h-BN-water nanofluids. Michael et al [17] measured the thermo-physical properties of h-BN nanofluids having EG and EG/W (40/60) mixture ratio as the base fluid. A TC enhancement as high as 15.5% with EG as the base fluid and 12.5% with EG/W (40/60) as the base fluid for 3 vol% of h-BN was reported.…”

Section: Introductionmentioning

confidence: 99%

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Effect of particle concentration and temperature on the thermo-physical properties of ethylene glycol–water mixture based boron nitride nanofluids

et al. 2020

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Present article focusses on the thermal and rheological characteristics of ethylene glycol-water mixture (volume = 60/40) based boron nitride (h-BN) nanofluids measured at different volume concentrations (0.5-2 vol% h-BN) between temperatures 30-60 °C. X-ray diffraction and TEM analysis have confirmed the hexagonal structure of h-BN nanoparticles and the size range of the nanoparticles is within 90-170 nm. To optimize the ultrasonication time, the thermal conductivity of h-BN nanofluids has been monitored after each 30 min of sonication until a maximum thermal conductivity increase is achieved. The thermal conductivity of h-BN nanofluids shows an increasing trend with respect to particle concentration. Also, the thermal conductivity enhancement exhibits a temperature independent nature. The viscosity studies carried out over a shear rate of 0.612-122 s −1 revealed an increasing trend with the increasing concentration of h-BN loading. For all the volume concentrations, at lower shear rates, the viscosity initially decreased, displaying a non-Newtonian nature, and with a further increase in shear rate, the viscosity stays constant exhibiting a Newtonian nature. Based on the experimental outcomes, a correlation is introduced. The correlation showed a strong agreement with the current results, with an R 2 value of 0.99.

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Section: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Effect of particle concentration and temperature on the thermo-physical properties of ethylene glycol–water mixture based boron nitride nanofluids

et al. 2020

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“…İlhan et al [34] reported an enhancement of thermal conductivity for hexagonal BN nanofluids of up to 26%, 22% and 16% at volume concentrations of 3% for water, water/ethylene glycol mixture and ethylene glycol based nanofluids, respectively. Lastly, Michael et al [35] investigated near spherical BN nanoparticles in the concentration range 0.5-3 in vol.% dispersed in ethylene glycol and a mixture of water/ethylene glycol. Thermal conductivity enhancement of these nanofluids is higher than 12% at 3 vol.% without change with temperature increase.…”

Section: Introductionmentioning

confidence: 99%

Boron nitride nanotubes-based nanofluids with enhanced thermal properties for use as heat transfer fluids in solar thermal applications

Gómez‐Villarejo

Estellé

Navas

2020

Solar Energy Materials and Solar Cells

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Nanofluids are considered as promising alternative in heat exchange processes to the classical fluids, which usually present poor thermal properties. One interesting application for nanofluids is as heat transfer fluid in solar thermal applications plants. Boron nitride nanotubes present interesting thermophysical properties for use in nanofluids. Therefore, nanofluids based on boron nitride nanotubes were prepared by a two-step method, dispersing this nanomaterial in a heat transfer fluid typically used. Stability, rheological and thermal properties of the nanofluids were analysed. To check the stability, ultraviolet-visible spectroscopy and particle size and -potential measurements were performed for a month, obtaining that the nanofluids were stable. Furthermore, surface tension was measured and no significant differences were observed with regard to the base fluid. In a variable range of temperature, nanofluids show Newtonian behaviour with a slight increase in viscosity. Besides, the boron nitride nanotubes caused an increase in thermal conductivity of up to 33% with regard to the base fluid. The use of these nanofluids also led to an improvement in the heat transfer coefficient under turbulent flow conditions of up to 18%. Finally, the analysis of the outlet temperature in solar thermal applications shows that these nanofluids are a promising alternative in this application.

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“…The temperature rise is supposed to intensify the Brownian motion, which results in more collision as well as a reduction in the viscosity. Besides this, at a higher temperature, the surfactant adsorption might start dissociating, leading to aggregation and instability, which affects the thermal performance [ 45 ]. In contrast to pristine nanofluids, the surfactant induced steric effect competes to balance the gravity effect and suppresses the quick flocculation up to certain concentrations (of SDS) beyond which flocculation might happen.…”

Section: Resultsmentioning

confidence: 99%

“…Unlike the current investigation, previous studies have not shown any significant temperature dependence of nanofluids relative to thermal conductivity in the presence of surfactants. However, the increase in the absolute thermal conductivity of nanofluids has been referred to as the intrinsic behavior of base fluids [ 45 ]. In addition, it has also been reported that the addition of surfactants into the base fluid network may affect the thermal conductivity and viscosity [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

Two-Dimensional Tungsten Disulfide-Based Ethylene Glycol Nanofluids: Stability, Thermal Conductivity, and Rheological Properties

et al. 2020

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Developing stable nanofluids and improving their thermo-physical properties are highly important in heat transfer applications. In the present work, the stability, thermal conductivity, and rheological properties of tungsten disulphide (WS2) nanoparticles (NPs) with ethylene glycol (EG) were profoundly examined using a particle size analyzer, zeta-sizer, thermal property analyzer, rheometer, and pH measuring system. WS2 NPs were characterized by various techniques, such as XRD (X-Ray Diffraction), FTIR (Fourier Transform Infrared Spectroscopy), FESEM (Field emission scanning electron microscopy), and high-resolution transmission electron microscopy (HRTEM). The nanofluids were obtained with the two-step method by employing three volume concentrations (0.005%, 0.01%, and 0.02%) of WS2. The influence of different surfactants (Sodium dodecyl sulphate (SDS), Sodium dodecylbenzenesulfonate (SDBS), Cetyltrimethylammonium bromide (CTAB)) with various volume concentrations (0.05–2%) on the measured properties has also been evaluated. Pristine WS2/EG nanofluids exhibit low zeta potential values, i.e., −7.9 mV, −9.3 mV, and −5 mV, corresponding to 0.005%, 0.01%, and 0.02% nanofluid, respectively. However, the zeta potential surpassed the threshold (±30 mV) and the maximum values reached of −52 mV, −45 mV, and 42 mV for SDS, SDBS, and CTAB-containing nanofluids. This showed the successful adsorption of surfactants onto WS2, which was also observed through the increased agglomerate size of up to 1720 nm. Concurrently, particularly for 0.05% SDS with 0.005% WS2, thermal conductivity was enhanced by up to 4.5%, with a corresponding decrease in viscosity of up to 10.5% in a temperature range of (25–70 °C), as compared to EG. Conversely, the viscoelastic analysis has indicated considerable yield stress due to the presence of surfactants, while the pristine nanofluids exhibited enhanced fluidity over the entire tested deformation range. The shear flow behavior showed a transition from a non-Newtonian to a Newtonian fluid at a low shear rate of 10 s−1. Besides this, the temperature sweep analysis has shown a viscosity reduction in a range of temperatures (25–70 °C), with an indication of a critical temperature limit. However, owing to an anomalous reduction in the dynamic viscosity of up to 10.5% and an enhancement in the thermal conductivity of up to 6.9%, WS2/EG nanofluids could be considered as a potential candidate for heat transfer applications.

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Thermo-physical properties of pure ethylene glycol and water–ethylene glycol mixture-based boron nitride nanofluids

Cited by 19 publications

References 49 publications

Effect of particle concentration and temperature on the thermo-physical properties of ethylene glycol–water mixture based boron nitride nanofluids

Effect of particle concentration and temperature on the thermo-physical properties of ethylene glycol–water mixture based boron nitride nanofluids

Boron nitride nanotubes-based nanofluids with enhanced thermal properties for use as heat transfer fluids in solar thermal applications

Two-Dimensional Tungsten Disulfide-Based Ethylene Glycol Nanofluids: Stability, Thermal Conductivity, and Rheological Properties

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