Experimental investigations and theoretical determination of thermal conductivity and viscosity of TiO 2 –ethylene glycol nanofluid

Khedkar, Rohit S.; Shrivastava, Neeraj; Sonawane, Shriram S.; Wasewar, Kailas L.

doi:10.1016/j.icheatmasstransfer.2016.02.004

Cited by 106 publications

(20 citation statements)

References 31 publications

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“…Patel et al [78] observed that the increments in thermal conductivity of the nanofluids were directly proportional to temperature. This result was in agreement with observations reported later by [34,39,55,80,81,88,95,99,100,104,109,[111][112][113][115][116][117][118]131]. Even in case of dispersing nanotubes in base fluids, the thermal conductivity enhancement increased with increasing temperature nonlinearly [28,79,102,119,147].…”

Section: Nanoparticle Thermal Conductivitysupporting

confidence: 93%

Experimental studies of nanofluid thermal conductivity enhancement and applications: A review

Tawfik

2017

Renewable and Sustainable Energy Reviews

296

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In many applications, there is a critical need for enhancing the poor thermal conductivity of conventional fluids in order to develop efficient heat transfer fluids. This requirement can be met through dispersing nanometric particles in a given base fluid such as water, ethylene glycol, oil or air. The resulting nanofluids enhanced thermal conductivity of the base fluids. In order to evaluate this enhancement, nanofluid thermal conductivity is required to be measured. Several methods and techniques are covered in the present contribution. In addition, enhancements recorded experimentally are reviewed and summarized. Different parameters affecting on such enhancement are covered, including: nanoparticle concentration, size, shape and thermal conductivity. In addition, base fluid type, nanofluid bulk temperature and dispersion techniques are also covered parameters. However, nanofluids have the potential to contribute in several practical applications including solar thermal, transportation, electronic cooling, medical, detergency and military applications. In the present work, a brief overview of evolution in the use of nanofluids in some applications has been presented. According to this contribution, there is a critical need for further fundamental and applications of nanofluids studies in order to understand the physical mechanisms of using nanofluids as well as explore different aspects of applications of nanofluids.

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Section: Nanoparticle Thermal Conductivitysupporting

confidence: 93%

Experimental studies of nanofluid thermal conductivity enhancement and applications: A review

Tawfik

2017

Renewable and Sustainable Energy Reviews

296

View full text Add to dashboard Cite

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“…Preparation of nanofluids also has two methods: one-step method and two-step method. Most literature reported that the nanofluids prepared by two-step method have a good stability [12,13].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electrical Insulation and Heat Transfer Performance of Vegetable Oil Based Nanofluids

Yao

Huang

et al. 2018

Journal of Nanomaterials

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Nanoparticles enhance the electrical insulation and thermal properties of vegetable oil, and such improvements are desirable for its application as an alternative to traditional insulating oil for power transformers. However, the traditional method of insulating nanofluids typically achieves high electrical insulation but low thermal conductivity. This work reports an environmentally friendly vegetable oil using exfoliated hexagonal boron nitride (h-BN) showing high thermal conductivity and high electrical insulation. Stable nanofluids were prepared by liquid exfoliation of h-BN in isopropyl alcohol. With 0.1 vol.% of the nano-oil, the AC breakdown voltage increased by 18% at 25 ∘ C and 15% at 90 ∘ C. Both the positive and negative lightning impulse breakdown voltages of the nanooil were also enhanced compared with those of the pure oil. Moreover, the thermal conductivity of the nano-oil increased by 11.9% at 25 ∘ C and 14% at 90 ∘ C. Given its high thermal conductivity, the nano-oil exhibited faster heating and cooling effects than the pure oil. Nano-oils with an electric field (either DC or AC) displayed a faster thermal response than that without an electric field. The reason is that h-BN is oriented under the electric field and formed a thermal network to increase the heat transfer.

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“…TiO 2 –EG nanofluids have been examined for rheological properties by Cabaleiro et al [ 16 ], and they presented that this material exhibit a non-Newtonian shear-thinning nature, on the other hand Khedkar et al [ 17 ] classified this material as Newtonian fluid. This shows that the physical properties of nanofluids require further experimental studies.…”

Section: Introductionmentioning

confidence: 99%

“…al. [ 17 ] presented results of experimental investigations and theoretical determination of thermal conductivity of TiO 2 –ethylene glycol nanofluids. They confirmed that thermal conductivity in these nanofluids increase linearly with volume concentration of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Electrical Conductivity and Permittivity of SC-TiO 2 -EG Nanofluids

et al. 2016

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The paper presents experimental studies of dielectric properties of nanofluids based on ethylene glycol and SC-TiO2 nanoparticles with average size of 15–40 nm with various mass concentrations. The dielectric permittivity both real part and imaginary part as a function of temperature and frequency were measured. Also, dependence ac conductivity on frequency, temperature, and mass concentration were investigated. Based on the curves of ac conductivity, dc conductivity was calculated, and 400 % enhancement in dc conductivity was exposed.

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Experimental investigations and theoretical determination of thermal conductivity and viscosity of TiO 2 –ethylene glycol nanofluid

Cited by 106 publications

References 31 publications

Experimental studies of nanofluid thermal conductivity enhancement and applications: A review

Experimental studies of nanofluid thermal conductivity enhancement and applications: A review

Enhanced Electrical Insulation and Heat Transfer Performance of Vegetable Oil Based Nanofluids

Experimental Investigation of Electrical Conductivity and Permittivity of SC-TiO 2 -EG Nanofluids

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