Study of thermal conductivity of nanofluids for the application of heat transfer fluids

Yoo, Dae-Hwang; Hong, Kyong-Soo; Yang, Ho‐Soon

doi:10.1016/j.tca.2006.12.006

Cited by 296 publications

(119 citation statements)

References 11 publications

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“…The thermal conductivities of alumina/DI water, alumina/EG, and copper oxide/EG are compared with available published results [38][39][40][41][42]. The nanofluids were dispersed using the bath sonicator and the results are presented in results within the experimental uncertainty.…”

Section: Comparison With Publishedmentioning

confidence: 99%

Effects of Particle Surface Charge, Species, Concentration, and Dispersion Method on the Thermal Conductivity of Nanofluids

Gowda

Sun

Wang

et al. 2010

Advances in Mechanical Engineering

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The purpose of this experimental study is to evaluate the effects of particle species, surface charge, concentration, preparation technique, and base fluid on thermal transport capability of nanoparticle suspensions (nanofluids). The surface charge was varied by changing the pH value of the fluids. The alumina (Al 2 O 3 ) and copper oxide (CuO) nanoparticles were dispersed in deionized (DI) water and ethylene glycol (EG), respectively. The nanofluids were prepared using both bath-type and probe sonicator under different power inputs. The experimental results were compared with the available experimental data as well as the predicted values obtained from Maxwell effective medium theory. It was found that ethylene glycol is more suitable for nanofluids applications than DI water in terms of thermal conductivity improvement and stability of nanofluids. Surface charge can effectively improve the dispersion of nanoparticles by reducing the (aggregated) particle size in base fluids. A nanofluid with high surface charge (low pH) has a higher thermal conductivity for a similar particle concentration. The sonication also has a significant impact on thermal conductivity enhancement. All these results suggest that the key to the improvement of thermal conductivity of nanofluids is a uniform and stable dispersion of nanoscale particles in a fluid.

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Section: Comparison With Publishedmentioning

confidence: 99%

Effects of Particle Surface Charge, Species, Concentration, and Dispersion Method on the Thermal Conductivity of Nanofluids

Gowda

Sun

Wang

et al. 2010

Advances in Mechanical Engineering

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“…It provides more interesting application in industrial fluids system including as heat transfer, magnetic, and lubricant [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Electrical Conductivity Enhancement of Water Based Maghemite (γ-Fe<sub>2</sub>O<sub>3</sub>) Nanofluids

Nurdin¹

2017

IJMSA

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Abstract:The study of this research is to measure the electrical conductivity of maghemite nanofluids. Maghemite nanofluids were prepared by dissolving maghemite nanoparticles in water as base fluids. The investigation on electrical conductivity of maghemite nanofluids have been performed at different particle volume fractions and temperatures. The electrical conductivity was measured by a 4-cell conductivity electrode meter. The electrical conductivity of maghemite nanofluids was linearly increased as the particle volume fraction and temperature rises. The highest enhancement of electrical conductivity of maghemite nanofluids due to the particle volume fraction and temperature are 160.49% and 22.55%, respectively. This condition obtained at a particle volume fraction of 2.5% and temperature 60°C. Significant effect of particle volume fraction and temperature were considered.

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“…Figure 12 shows the Field Emission Scanning Electron Microscopic (FESESM) image of the prepared TiO 2 nanofluid. Yoo et al [69] found that TiO 2 nanofluid showed higher thermal conductivity as compared to the nanofluid of Al 2 O 3 . TiO 2 nanofluid containing 1 vol.% nanoparticles.…”

Section: Ultrasonication Methodsmentioning

confidence: 99%

Preparation Techniques of TiO2 Nanofluids and Challenges: A Review

et al. 2018

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Titanium dioxide (TiO 2 ) has been used extensively because of its unique thermal and electric properties. Different techniques have been used for the preparation of TiO 2 nanofluids which include single-step and two-step methods. In the natural world, TiO 2 exists in three different crystalline forms as anatase, brookite, and rutile. Nanoparticles are not used directly in many heat transfer applications, and this provides a major challenge to researchers to advance towards stable nanofluid preparation methods. The primary step involved in the preparation of nanofluid is the production of nano-sized solid particles by using a suitable technique, and then these particles are dispersed into base fluids like oil, water, paraffin oil or ethylene glycol. However, nanofluid can also be prepared directly by using a liquid chemical method or vapor deposition technique (VDT). Nanofluids are mostly used in heat transfer applications and the size and cost of the heat transfer device depend upon the working fluid properties, thus, in the past decade scientists have made great efforts to formulate stable and cost-effective nanofluids with enhanced thermophysical properties. This review focuses on the different synthesis techniques and important physical properties (thermal conductivity and viscosity) that need to be considered very carefully during the preparation of TiO 2 nanofluids for desired applications.

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Study of thermal conductivity of nanofluids for the application of heat transfer fluids

Cited by 296 publications

References 11 publications

Effects of Particle Surface Charge, Species, Concentration, and Dispersion Method on the Thermal Conductivity of Nanofluids

Effects of Particle Surface Charge, Species, Concentration, and Dispersion Method on the Thermal Conductivity of Nanofluids

Investigation on Electrical Conductivity Enhancement of Water Based Maghemite (γ-Fe<sub>2</sub>O<sub>3</sub>) Nanofluids

Preparation Techniques of TiO2 Nanofluids and Challenges: A Review

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Study of thermal conductivity of nanofluids for the application of heat transfer fluids

Cited by 296 publications

References 11 publications

Effects of Particle Surface Charge, Species, Concentration, and Dispersion Method on the Thermal Conductivity of Nanofluids

Effects of Particle Surface Charge, Species, Concentration, and Dispersion Method on the Thermal Conductivity of Nanofluids

Investigation on Electrical Conductivity Enhancement of Water Based Maghemite (γ-Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;) Nanofluids

Preparation Techniques of TiO2 Nanofluids and Challenges: A Review

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Investigation on Electrical Conductivity Enhancement of Water Based Maghemite (γ-Fe<sub>2</sub>O<sub>3</sub>) Nanofluids