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. 2022 Apr 27;12(9):1489.
doi: 10.3390/nano12091489.

Electrohydrodynamics Analysis of Dielectric 2D Nanofluids

Mrutyunjay Maharana  1   2 , Niharika Baruah  3 , Sisir Kumar Nayak  3 , Niranjan Sahoo  3 , Kai Wu  1 , Lalit Goswami  4
Affiliations

Electrohydrodynamics Analysis of Dielectric 2D Nanofluids

Mrutyunjay Maharana et al. Nanomaterials (Basel). .

Abstract

The purpose of this present study is to prepare a stable mineral-oil (MO)-based nanofluid (NF) for usage as a coolant in a transformer. Nanoparticles (NPs) such as hexagonal boron nitride (h-BN) and titanium oxide (TiO2) have superior thermal and electrical characteristics. Their dispersion into MO is likely to elevate the electrothermal properties of NFs. Therefore, different batches of NFs are prepared by uniformly dispersing the insulating h-BN and semiconducting TiO2 NP of different concentrations in MO. Bulk h-BN NP of size 1μm is exfoliated into 2D nanosheets of size 150-200 nm, subsequently enhancing the surface area of exfoliated h-BN (Eh-BN). However, from the zeta-potential analysis, NP concentration of 0.01 and 0.1 wt.% are chosen for further study. The thermal conductivity and ACBDV studies of the prepared NF are performed to investigate the cooling and insulation characteristics. The charging-dynamics study verifies the enhancement in ACBDV of the Eh-BN NF. Weibull statistical analysis is carried out to obtain the maximum probability of ACBDV failure, and it is observed that 0.01 wt.% based NF has superior cooling and insulation properties than MO and remaining batches of NFs.

Keywords: 2D nanomaterials; breakdown; charge dynamics; electrophoresis; nanodielectrics; thermal conductivity; voltage.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) Preparation of nanofluids; (b) stability of NFs at different concentrations of nanofiller.
Figure 2
Figure 2
Thermal conductivity of NFs with the rise in temperature.
Figure 3
Figure 3
Mean ACBDV of MO and NFs at 18 and 24 ppm moisture content.
Figure 4
Figure 4
Enhancement of ACBDV of NFs between 0.01 and 0.1 wt.% of NP concentration for a moisture level of 18 and 24 ppm.
Figure 5
Figure 5
Enhancement of ACBDV of NFs between 18 and 24 ppm moisture level for 0.01 and 0.1 wt % of NP concentration.
Figure 6
Figure 6
Weibull probability distribution fluid samples (a) 18 ppm (b) 24 ppm.
Figure 7
Figure 7
Study of zeta potential with the surface layer of the NPs.
Figure 8
Figure 8
Charging of the NP (a) particle exposed to an external field, (b) ionization or polarization of the NP, (c) depletion of the positive ions, and (d) complete depletion of the positive ions.
Figure 9
Figure 9
Charging characteristics of Eh-BN and TiO2 in MO.
See this image and copyright information in PMC

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