Heat transfer and rheological properties of transformer oil-oxidized MWCNT nanofluid

Beheshti, Amir; Shanbedi, Mehdi; Heris, Saeed Zeinali

doi:10.1007/s10973-014-4048-0

Cited by 126 publications

(49 citation statements)

References 35 publications

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“…It is also key factor to characterize the transformer oil. Beheshti et al [48] characterized all samples with pour point less than −45 ∘ C.…”

Section: Physical and Thermal Properties Physical And Thermalmentioning

confidence: 99%

“…Flash point is considered as one of the quality indicators to determine the chance of fire hazard. Beheshti et al [48] measured the flash point with respect to concentration of nanoparticles as shown in Figure 18. The flash point for nanofluid indicated 4.6% enhancement at concentration (0.001 mass fraction %) whereas flash point drops with further increase of concentration.…”

Section: Physical and Thermal Properties Physical And Thermalmentioning

confidence: 99%

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A Review on Properties, Opportunities, and Challenges of Transformer Oil-Based Nanofluids

Rafiq

2016

Journal of Nanomaterials

133

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The mineral oil or synthetic oil in conjunction with paper is mainly being applied as dielectric medium in many of the high voltage apparatus. However, the advent of high voltage levels such high voltage alternating current (HVAC) and high voltage direct current (HVDC) has prompted researchers to direct their focus onto an insulation system which can bear the rising high voltage levels. The modern insulating liquid material development is guided by various factors such as high electrical insulation requirements and other safety and economic considerations. Therefore transformer manufacturer companies have to design transformers with these new specific requirements. The transformer oil-based nanofluids with improved dielectric and thermal properties have the potential to replace mineral oil base products in the market place. They are favorable because they function more superior than mineral oil and they contribute definite insulating and thermal gains. This paper reviews recent status of nanofluids use as transformer oils. The nanofluids used as transformer oils are presented and their advantages are described in comparison with mineral oil. The multiple experimental works carried out by different researchers are described, providing an overview of the current research conducted on nanofluids. In addition scope and challenges being confronted in this area of research are clearly presented.

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“…It is also key factor to characterize the transformer oil. Beheshti et al [48] characterized all samples with pour point less than −45 ∘ C.…”

Section: Physical and Thermal Properties Physical And Thermalmentioning

confidence: 99%

Section: Physical and Thermal Properties Physical And Thermalmentioning

confidence: 99%

A Review on Properties, Opportunities, and Challenges of Transformer Oil-Based Nanofluids

Rafiq

2016

Journal of Nanomaterials

133

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“…The increase in thermal conductivity of nanofluids containing various types of nanoparticles was intensively studied [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. However, when planning the practical use of nanofluids, it should be taken into account that with increasing concentration of the nanoparticles in a liquid its viscosity increases [19,20,26].…”

Section: Introductionmentioning

confidence: 99%

Viscosity and thermal conductivity of MgO–EG nanofluids

Żyła

2017

J Therm Anal Calorim

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Nanofluids are a group of novel engineering materials that are increasingly being used, particularly in the processes of heat exchange. One of the most promising materials in this group is magnesium oxide-ethylene glycol (MgO-EG) nanofluid. The literature informs that this material is characterized by an significant increase in thermal conductivity with low dynamic viscosity increase. The aim of this paper is to provide experimental data on the dynamic viscosity and thermal conductivity of nanofluids containing MgO nanoparticles with 20 nm average size and ethylene glycol as base fluid. To determine dynamic viscosity and thermal conductivity of samples, a HAAKE MARS 2 rheometer (Thermo Electron Corporation, Karlsruhe, Germany) and KD2 Pro Thermal Properties Analyzer (Decagon Devices Inc., Pullman, Washington, USA) were used. Additionally, a comparison of the experimental results and the predictions of theoretical models was presented. It was presented that the vast majority of theoretical models does not describe in a correct way both viscosity and thermal conductivity. It was also shown that the enhancement of this basic physical properties might be described with good result with second degree polynomials. Finally, evaluation of the heat transfer performance was presented.

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“…Various fluids have been used to transfer energy that is absorbed by the evaporator [7,8]. Recently, because of nanofluids' unique properties with regard to high performance heat transfer, they have begun to attract the interest of many scientists [9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Choi and Eastman [23] were the first to synthesize a new nanofluid that had higher thermal conductivity than the base fluid.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer performance of two-phase closed thermosyphon with oxidized CNT/water nanofluids

et al. 2015

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Heat transfer and rheological properties of transformer oil-oxidized MWCNT nanofluid

Cited by 126 publications

References 35 publications

A Review on Properties, Opportunities, and Challenges of Transformer Oil-Based Nanofluids

A Review on Properties, Opportunities, and Challenges of Transformer Oil-Based Nanofluids

Viscosity and thermal conductivity of MgO–EG nanofluids

Heat transfer performance of two-phase closed thermosyphon with oxidized CNT/water nanofluids

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