Dielectric Properties of Boron Nitride-Ethylene Glycol (BN-EG) Nanofluids

Fal, Jacek; Cholewa, M.; Gizowska, Magdalena; Witek, A.; Żyła, Gaweł

doi:10.1007/s11664-016-4971-x

Cited by 11 publications

(5 citation statements)

References 66 publications

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“…Meanwhile, BNNTS are basically electrically insulators and are appealing insulating materials with high thermal conductivity [35]. BN is also a highly stable dielectric ceramic material and interesting behaviour has been reported related to the electric and magnetic properties of nanofluids based on BN [36][37][38].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Experimental analysis of water-based nanofluids using boron nitride nanotubes with improved thermal properties

Gómez‐Villarejo

Aguilar

Hamze

et al. 2019

Journal of Molecular Liquids

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Nowadays, the use of nanofluids as alternative to commonly-used industrial heat transfer fluids is a topic of increasing interest. Analysing the improved efficiency of heat transfer processes according to advanced nanomaterials and obtaining stable nanofluids is one of the most interesting challenges. This paper presents a study of nanofluids based on boron nitride nanotubes and using an aqueous solution of Triton X-100 (which acts as a surfactant) as the base fluid. UV-vis spectroscopy, particle size measurements (size between 150-170 nm) and  potential (at about -25 mV) showed that stable nanofluids were obtained. Surface tension measurements were also performed. The surface tension of water was weakly affected by the presence of any amount of nanoparticles and was mainly governed by the presence of surfactant. The rheological properties of the fluids were also analysed, as were their isobaric specific heat and thermal conductivity values. A Newtonian behaviour was observed for the base fluid and the nanofluids, with no significant increase in viscosity. The isobaric specific heat increased by 8% and thermal conductivity by 10 % compared with the base fluid.Thus, the results obtained are interesting because while thermal properties improved with nanoparticle content, rheological behaviour did not change. Consequently, the nanofluids studied in the current paper do not raise the pressure drop and pumping power significantly and may therefore be a good option for thermal system applications. HighlightsStable nanofluids based on boron nitride nanotubes were prepared and analysed Isobaric specific heat increased by 8% and thermal conductivity by 10 % Newtonian behaviour was found for nanofluids with no significant increase in viscosity Surface tension was mainly governed by the presence of Triton X-100 as surfactant Rheological behaviour is not changed with nanoparticle content

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Section: Accepted Manuscriptmentioning

confidence: 99%

Experimental analysis of water-based nanofluids using boron nitride nanotubes with improved thermal properties

Gómez‐Villarejo

Aguilar

Hamze

et al. 2019

Journal of Molecular Liquids

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“…Jacek et al demonstrate that the addition of BN nanoplates in the ethylene glycol significantly increases the direct current (DC) and AC conductivity of base fluids. An 11‐fold increase in the dc conductivity is found for 20 wt.% of BN‐nanofluid [20]. Itseems that nanofluids with the same nanofillers but with different base fluid showed different dielectric performances.…”

Section: Introductionmentioning

confidence: 99%

Exponentially reduced carrier mobility of natural ester via blocking effect of 2D hexagonal boron nitride nanosheets

Huang

et al. 2020

High Voltage

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In this work, the boron nitride (BN) nanosheets were dispersed in natural esters to fabricate the dielectric nanofluid. Microstructures and chemical compositions of the nanosized BN are determined. The stability, viscosity, and thermal conductivity of the BN nanofluid, were obtained. And the dissipation factor, electrical conductivity, and relative permittivity of the BN nanofluid, were measured. The ion mobilities and migrating times of the nanofluid were measured under different volumetric fractions of BN nanosheets and temperatures. Results show that the electrical conductivity and dissipation factor of the nanofluid decreased by 54% and 48% with the addition of only 0.1% of BN nanosheets under 110°C. Both the half‐reduced carrier mobility of the nanofluid and the declined ion concentration by blocking of BN nanosheet contributed to the exponentially reduced electrical conductivity and enhanced dielectric performances of the BN nanofluid. The suppression coefficient k is proposed to quantitatively describe the hinder effect of ion migration in nanofluids by 2D BN nanosheet. Results provide a strategy to design and develop advanced nanofluids with low‐dielectric loss by aids of surface adsorption of ion and steric hindrance of 2D nanosheets.

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“…Salehirad and Nikje 30 revealed that the addition of a low weight fraction of modified BN to the mineral oil could improve its thermal conductivity and electrical features without suppressing other properties. Fal et al 31 investigated the electrical conductivity of BN nanofluids. The results proved that the volume concentration could have an influence on electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the temperature distribution inside the engine compartment of a fuel cell vehicle with nanofluids as coolant

Tao

Chen

et al. 2021

Int J Energy Res

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Proton exchange membrane fuel cells have a development prospect to replace the internal combustion engines due to their sustainability and environmental friendliness. However, one of the challenges is the requirement of heat removal from fuel cell engines and keep operation at relatively low temperatures (ie,~60 C-80 C). In the current research, the thermal performance of zinc oxide (ZnO) and boron nitride (BN) nanofluids is investigated by numerical simulation inside the engine compartment for a fuel cell vehicle. The maximum heat transfer rate was obtained by theoretical calculation and onedimensional simulation. The results revealed that the maximum heat transfer rate for ZnO nanofluids and BN nanofluids had increased by 7.6% and 2.0% than 50% water and ethylene glycol (WEG), respectively. Compared to 50% WEG, the energy consumption of the pump and fan could be further reduced with the nanofluids as a coolant. The influence on the temperature field and flow field inside the engine compartment of fuel cell vehicle is revealed with nanofluids by computational fluid dynamic. The results could provide data for the manufacturers to use nanofluids as a coolant to optimize the structure arrangement inside the engine compartment of fuel cell vehicle.

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Dielectric Properties of Boron Nitride-Ethylene Glycol (BN-EG) Nanofluids

Cited by 11 publications

References 66 publications

Experimental analysis of water-based nanofluids using boron nitride nanotubes with improved thermal properties

Experimental analysis of water-based nanofluids using boron nitride nanotubes with improved thermal properties

Exponentially reduced carrier mobility of natural ester via blocking effect of 2D hexagonal boron nitride nanosheets

Numerical investigation on the temperature distribution inside the engine compartment of a fuel cell vehicle with nanofluids as coolant

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