Estimation of the thermal properties of MgO-SiO2/water hybrid nanofluid and development of novel thermo-economically viable model for heat transfer applications

Poloju, Vamshi Krishna; Mukherjee, Sayantan; Mishra, Purna Chandra; Aljuwayhel, Nawaf F.; Ali, Naser; Khadanga, Vidyasri

doi:10.1007/s00231-023-03432-1

Cited by 4 publications

(2 citation statements)

References 37 publications

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“…Despite the presence of an interfacial nanolayer in epoxy/5 wt.% SiO 2 and MgO nanocomposites, the breakdown occurred to a lesser extent in the epoxy/MgO nanocomposite, as shown in Figure 11D [39,42,43]. This discrepancy can be attributed to the distinct thermal conductivity of each material [41].…”

Section: Dielectric Propertiesmentioning

confidence: 94%

Electrical Characterization of Epoxy Nanocomposite under High DC Voltage

Alsoud,

Daradkeh,

Al-Bashaish

et al. 2024

Polymers

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This work studies the direct current breakdown characteristics of unfilled epoxy and epoxy nonconductive nanocomposites (SiO2,MgO and Al2O3). It also examines the variation of electrical properties in epoxy nanocomposites. The novel aspect of this study is that the samples of Epoxy nanocomposite were exposed to high voltages of up to six kilo volts for three hours using field electron microscopy under high vacuum conditions (10−5 mbar). The current emitted from these samples was measured at three different intervals of time. In addition, the influence of high voltage on the permittivity, loss factor (tan(δ)), and conductivity of the epoxy nanocomposite was studied. This evaluation was conducted before and after applying the voltage at room temperature, The frequency range extends from 10−2–10−7 Hz using the Novo Control Alpha-A analyzer. Current–voltage characterization was performed through field electron microscopy. The samples were characterized by scanning electron microscopy–energy dispersive X-ray spectroscopy and Fourier Transform Infrared Spectroscopy. The unfilled epoxy exhibited structural degradation, resulting in the formation of holes when exposed to high voltages of up to six kilo volts, leading to a reduction in electrical properties. Nevertheless, the addition of nanoparticles shows a significant increase in the operational lifetime of the epoxy nanocomposite. The degree of increase in the lifetime of epoxy composite varied depending on several factors such as the type of NPs introduced and their respective sizes. The epoxy/Al2O3 nanocomposite comparing with epoxy/MgO and epoxy/SiO2 nanocomposite showed elevated resistance to direct current breakdown strength and maintaining its dielectric.

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Section: Dielectric Propertiesmentioning

confidence: 94%

Electrical Characterization of Epoxy Nanocomposite under High DC Voltage

Alsoud,

Daradkeh,

Al-Bashaish

et al. 2024

Polymers

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“…As they achieved, the greater thermal conductivity of TO indicates the superior heat transfer speeds, conducting to more desirable lifespan, smaller size transformers, and higher e ciency [5][6][7]. Several nanoparticles (NPs) and carbon nanostructures have been utilized to fabricate nano uids to solve this problem [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Graphene Nanoplatelets- and Multi-Walled Carbon Nanotubes-Based Transformer Oil Nanofluids as Coolants with Enhanced Performance

Shanbedi,

Dashtbozorg,

Karimi

et al. 2024

Preprint

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Transformer oil (TO) is a highly pure oil that has high durability at high temperatures and is a superior electrical insulator. TO is utilized as insulation and coolant. One of the common problems of TO is overheating, especially in warm seasons, which reduces the efficiency of the transformer, power outages, etc. In this research, heat transfer (H.T.) coefficient, dimensionless numbers, dielectric breakdown voltage, and physical properties of nanofluids were investigated to improve the efficiency of the transformer by adding nanofluids, including graphene nanoplatelets (GNP) and multi-walled carbon nanotubes (MWCNT) to TO. The results showed that the natural convection heat transfer coefficient of 0.005%wt GNP/TO increased 8.6% and 12.8% compared to pure TO and 0.005%wt MWCNT/TO, respectively. Besides, the forced convection heat transfer coefficient of 0.005%wt GNP/TO enhanced 8.3% and 9.0% compared to pure TO and 0.005%wt MWCNT/TO, respectively. Dielectric breakdown voltage in GNP/TO and MWCNT/TO nanofluids decreased compared to pure TO due to free electrons. The density of TO also increased by adding GNP and MWCNT. The thermal conductivity (T.C.) of GNP/TO nanofluid was also higher than pure oil and MWCNT/TO and increased by rising temperature, while the thermal conductivity of natural transformer oil was reduced by raising the temperature.

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