Measurement of temperature-dependent viscosity and thermal conductivity of alumina and titania thermal oil nanofluids

Cieśliński, Janusz T.; Ronewicz, Katarzyna; Smoleń, Sławomir

doi:10.1515/aoter-2015-0031

Cited by 18 publications

(13 citation statements)

References 14 publications

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“…In order to avoid impact of the potential nanoparticle agglomeration, the viscosity of fresh prepared nanofluid was measured. Details of the measurement set-up and procedure are described in [18,19].…”

Section: Viscositymentioning

confidence: 99%

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A Comparison of Empirical Correlations of Viscosity and Thermal Conductivity of Water-Ethylene Glycol-Al2O3 Nanofluids

2020

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Because of their superb thermal conductivity, nanofluids are seen as new generation of cooling mediums in many engineering applications. It is well established that even a small amount of nanoparticles mixed with a base fluid may result in distinct thermal conductivity enhancement. On the other hand, addition of nanoparticles to the base fluid results in its substantial viscosity increase. Therefore, it is very difficult to evaluate the relative importance of viscosity and thermal conductivity of the nanofluid on convective heat transfer performance. In order to estimate such resultant impact properly, it is necessary to develop reliable correlation equations for predictions of these two thermophysical properties of nanofluids. In this paper, the thermal conductivity and dynamic viscosity of five fluids, i.e., pure water, ethylene glycol (EG) and three mixtures of water and EG with volume ratio of 40:60, 50:50 and 60:40 have been experimentally determined. The aforementioned fluids served as base fluids in nanofluids with Al2O3 nanoparticles at the concentration of 0.01%, 0.1% and 1% by weight. A set of 20 correlations for prediction of thermal conductivity and dynamic viscosity of base fluids and corresponding nanofluids has been developed. Moreover, present results have been confronted with literature data and predictions made by use of carefully selected recognized literature correlations.

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Section: Viscositymentioning

confidence: 99%

“…In order to avoid impact of potential agglomeration the thermal conductivity of fresh prepared nanofluid was measured (according to the work in [6] many abnormal thermal conductivity data in nanofluids result from unstable nanofluids). The details of the measurement set-up and procedure are described in [18,19].…”

Section: Thermal Conductivitymentioning

confidence: 99%

A Comparison of Empirical Correlations of Viscosity and Thermal Conductivity of Water-Ethylene Glycol-Al2O3 Nanofluids

2020

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“…The first stage of the research on the properties of nanofluids used in different applications involves their preparation, that is the proper 'combining' of the base fluid with a dispersant appearing in the form of spherical or cylindrical solid particles (nanopowders/nanoadditives/ nanoparticles) sized from 1 to 100 nm. The most frequently used base fluids include: deionized water, oil [49,50], ethylene and propylene glycol, glycerol and their mixtures, e.g., water and ethylene glycol (40:60 proportion by volume) [51].…”

Section: Preparationmentioning

confidence: 99%

Efficient Stabilization of Mono and Hybrid Nanofluids

Wciślik

2020

Energies

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Currently; the transfer of new technologies makes it necessary to also control heat transfer in different industrial processes—both in practical and research—applications. Not so long ago water and ethylene glycol were the most frequently used media in heat transfer. However, due to their relatively low thermal conductivity, they cannot provide the fast and effective heat transfer necessary in modern equipment. To improve the heat transfer rate different additives to the base liquid are sought, e.g., nanoadditives that create mono and hybrid nanofluids with very high thermal conductivity. The number of scientific studies and publications concerning hybrid nanofluids is growing, although they still represent a small percentage of all papers on nanofluids (in 2013 it was only 0.6%, and in 2017—ca. 3%). The most important point of this paper is to discuss different ways of stabilizing nanofluids, which seems to be one of the most challenging tasks in nanofluid treatment. Other future challenges concerning mono and hybrid nanofluids are also thoroughly discussed. Moreover, a quality assessment of nanofluid preparation is also presented. Thermal conductivity models are specified as well and new representative mono and hybrid nanofluids are proposed.

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“…For this reason, there are several methods to improve the heat transfer characteristics, which consist in adding high conducting solid particles to the base fluid. The resulting fluid is called the 'nanofluid' [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Unconfined laminar nanofluid flow and heat transfer around a rotating circular cylinder in the steady regime

Bouakkaz

Salhi

Khelili

et al. 2017

Archives of Thermodynamics

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In this work, steady flow-field and heat transfer through a copper-water nanofluid around a rotating circular cylinder with a constant nondimensional rotation rate α varying from 0 to 5 was investigated for Reynolds numbers of 5-40. Furthermore, the range of nanoparticle volume fractions considered is 0-5%. The effect of volume fraction of nanoparticles on the fluid flow and heat transfer characteristics are carried out by using a finite-volume method based commercial computational fluid dynamics solver. The variation of the local and the average Nusselt numbers with Reynolds number, volume fractions, and rotation rate are presented for the range of conditions. The average Nusselt number is found to decrease with increasing value of the rotation rate for the fixed value of the Reynolds num- * Corresponding Author.

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Measurement of temperature-dependent viscosity and thermal conductivity of alumina and titania thermal oil nanofluids

Cited by 18 publications

References 14 publications

A Comparison of Empirical Correlations of Viscosity and Thermal Conductivity of Water-Ethylene Glycol-Al2O3 Nanofluids

A Comparison of Empirical Correlations of Viscosity and Thermal Conductivity of Water-Ethylene Glycol-Al2O3 Nanofluids

Efficient Stabilization of Mono and Hybrid Nanofluids

Unconfined laminar nanofluid flow and heat transfer around a rotating circular cylinder in the steady regime

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