Thermal conductivity and dielectric characteristics of transformer oil filled with bn and Fe&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; nanoparticles

Du, B. X.; Li, Xiayu; Li, J.

doi:10.1109/tdei.2015.005079

Cited by 45 publications

(37 citation statements)

References 26 publications

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“…According to this, the shorter variations of resistivity and dissipation factor are produced with the same kind of nanoparticle-those with a semi-conductive nature (TiO 2 ). This has already been seen in other works with nanoparticles of a different nature [45,46]. This also agrees with the previous BDV results, as the nanoparticle capable of a better enhancement of this parameter in the base fluid (TiO 2 ) is the one that presents an improvement in its resistivity and a lower increase of the loss factor.…”

Section: Discussionsupporting

confidence: 93%

“…In the case of the thermal properties, the limited affectation found can be easily due to the low concentrations used in this research. Despite that the majority of references reflect improvements of the thermal conductivity beyond the uncertainty gap of this research, there are examples at similar concentrations with affectations close to 0, with titania nanoparticles [17] or other species [46,47], in mineral oils. The same could be said about the viscosity, as there exist studies with limited variations in this parameter due to the nanoparticles [40,41,47].…”

Section: Discussionmentioning

confidence: 94%

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Titania Nanofluids Based on Natural Ester: Cooling and Insulation Properties Assessment

et al. 2020

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The assessment of a TiO2 vegetal-based dielectric nanofluid has been carried out, and its characteristics and behavior have been tested and compared with a previously tested maghemite nanofluid. The results obtained reflect a similar affectation of the main properties, with a maximal improvement of the breakdown voltage of 33% at 0.5 kg/m3, keeping the thermal conductivity and the viscosity almost constant, especially the first one. This thermal characterization agrees with the results obtained when applying the TiO2 optimal nanofluid in the cooling of an experimental setup, with a slightly worse performance than the base fluid. Nevertheless, this performance is the opposite to that noticed with the ferrofluid, which was capable of improving the cooling of the transformer and decreasing its temperature. The similarities between the characterizations of both nanofluids, the differences in their cooling performances and their different magnetic natures seem to point out the presence of additional thermomagnetic buoyancy forces to support the improvement of the cooling.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 94%

Titania Nanofluids Based on Natural Ester: Cooling and Insulation Properties Assessment

et al. 2020

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“…Researchers worldwide have studied dielectric properties of transformer oil based nanofluid using insulating, conductive and semi-conductive nanoparticles and have demonstrated its improved dielectric strength and increased heat transfer capability of the liquid [5][6][7][8][9]. Du et al [10] studied both thermal and dielectric properties of transformer oil based nanofluid using boron nitride (BN) and Fe 3 O 4 nanoparticles. They observed an increase in thermal diffusivity, thermal conductivity and breakdown strength.…”

Section: Introductionmentioning

confidence: 99%

Investigation on heat transfer characteristics of nano titania added transformer oil with hotspot temperature

et al. 2020

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The heat transfer characteristics of nanofluid produced by mixing nano titania with transformer oil, facilitated by addition of surfactants are analyzed. A 2D model is used to analyze the heat transfer and fluid flow characteristics of nano fluid for understanding the formation of hot spots in the chamber filled with nanofluid. Governing equations for conservation of mass, momentum and energy for capturing the above characteristics are described. The temperature along the vertical mid line from the hot spot are measured experimentally and compared with simulation results. Temperature distribution obtained for nanofluid and transformer oil under both steady and transient state has revealed high rate of heat dissipation in nanofluid. Streamlines have shown the presence of press board affects flow in the bulk of the cavity. Nusselt number estimated across the edges of the hot spot has shown higher convective heat transfer in nanofluid.

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“…The idea of adding particles in order to increase thermal conductivity goes back to Maxwell in 1873 [1] and Choi et al [2] were the first to add magnetic nanoparticles Fe 3 O 4 to pure transformer oil and to develop the first nanofluid that demonstrated better thermal conductivity. However, several researchers soon realized that the dispersion of some nanoparticles increased the breakdown voltage at the same time [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and their interest also turned to this direction.…”

Section: Introductionmentioning

confidence: 99%

“…Researchers in [3][4][5][6][7][8][9][10] studied iron oxide nanoparticles, Fe 3 O 4 and Fe 2 O 3 , and found they enhanced dielectric and the cooling performance of the constitutive base fluids when they were dispersed in either mineral or natural ester oils. The dispersion of two-dimensional nanoparticles, such as boron nitride (BN) or graphene nanoparticles, also enhanced the cooling capacities of transformer oil [3,11].…”

Section: Introductionmentioning

confidence: 99%

Dielectric Insulation Characteristics of Natural Ester Fluid Modified by Colloidal Iron Oxide Ions and Silica Nanoparticles

et al. 2019

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In this study, the dielectric characteristics of two types of natural esters modified into nanofluids are studied. The AC breakdown voltage was investigated for colloidal Fe2O3 and SiO2 nanoparticles effectively scattered in natural ester oil. The experimental results identify an increase in the breakdown voltage of the nanofluid with colloidal Fe2O3 conductive nanoparticles. In contrast, the breakdown voltage was reduced by adding SiO2 nanoparticles in the same matrix. The potential well distribution of the two different types of nanoparticles was also calculated in order for the results of the experiment to be explained. The dielectric losses of the colloidal nanofluid are compared with the matrix oil and studied at 25 °C and 100 °C in the frequency regime of 10−1–106 Hz. The experimental data and the theoretical study reveal that conductivity along with the permittivity of nanoparticles constitute a pivotal parameter in the performance of nanofluid. Specific concentrations of nanoparticles with different electrical conductivity and permittivity than those of matrix oil increase the breakdown voltage strength. Simultaneously, the addition of nanoparticles having electrical conductivity and permittivity comparable to the matrix oil results in reducing the breakdown voltage.

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Thermal conductivity and dielectric characteristics of transformer oil filled with bn and Fe<sub>3</sub>O<sub>4</sub> nanoparticles

Cited by 45 publications

References 26 publications

Titania Nanofluids Based on Natural Ester: Cooling and Insulation Properties Assessment

Titania Nanofluids Based on Natural Ester: Cooling and Insulation Properties Assessment

Investigation on heat transfer characteristics of nano titania added transformer oil with hotspot temperature

Dielectric Insulation Characteristics of Natural Ester Fluid Modified by Colloidal Iron Oxide Ions and Silica Nanoparticles

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