Experimental investigation and mechanism analysis: Effect of nanoparticle size on viscosity of nanofluids

Hu, Xichen; Yin, Deshun; Chen, Xuan; Xiang, Guangjian

doi:10.1016/j.molliq.2020.113604

Cited by 37 publications

(24 citation statements)

References 34 publications

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“…This result agrees with other researchers' work [38,39]. Although, it could be expected that viscosity would decrease with increasing NP size [40], this performance depends to a great extent on the NP concentration, which can cause a decrease or an increase in viscosity as the size of the NPs increases. [41].…”

Section: Nanoparticles Size -Viscositysupporting

confidence: 93%

Nanofluid as Advanced Cooling Technology. Success Stories

Esarte¹,

Riehl²,

Mancin³

et al. 2021

Heat Transfer - Design, Experimentation and Applications

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Nanofluids are defined as heat transfer fluids with enhanced heat transfer properties by the addition of nanoparticles. Nanofluid’s stability, nanoparticles’ type and their chemical compatibility with the base fluid are essential not only to increase the nanofluid’s thermophysical properties but also to ensure a long-lasting and thermal efficient use of the equipment in which it is used. Some of these aspects are discussed in this chapter. Likewise, the improvement in terms of the heat transfer capacity (thermal resistance) that the use of nanofluids has on the heat pipes-thermosyphons is shown. On the other hand, the improvement in energy efficiency that nanofluid causes in a vapor compression system is also presented.

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Section: Nanoparticles Size -Viscositysupporting

confidence: 93%

Nanofluid as Advanced Cooling Technology. Success Stories

Esarte¹,

Riehl²,

Mancin³

et al. 2021

Heat Transfer - Design, Experimentation and Applications

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“…As the fullerene cluster size decreases the viscosity also decreases, which agrees with previous observations for oxide nanoparticles, carbon nanotubes, and graphene oxide. 26,27 The wear scars on the balls after friction tests (Figure S2a MO is widely used as a lubricant that can be enhanced with the addition of nanomaterials. The MO and nano oils (MO/ C 60/70 , MO/T2.5/C 60/70 , and MO/T25/C 60/70 ) were evaluated by the ball on disk method to understand their lubrication properties.…”

Section: Resultsmentioning

confidence: 99%

Tuning Autoxidation and Friction of Mineral Oil by Fullerene Cluster Properties

Morelos-Gómez

Kondo²,

Omori³

et al. 2023

Ind. Eng. Chem. Res.

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Lubricant oils can autoxidize due to contact with air and can be accelerated by heat and catalyzed with metal ion impurities. Therefore, new antioxidant additives are needed. Carbon nanomaterials exhibit excellent thermal oxidation resistance and can act as additives for lubricant oils to extend their operational lifetime. In this work, we studied the autoxidation behavior of a mixture of C60/C70 clusters in mineral oil (MO) containing different amounts of toluene during mixing. The addition of toluene during mixing increased the ratio of C60/C70 and the cluster size. The oil-fullerene mixtures (MO/C60/70) were heated at 150 °C for 48 h under magnetic stirring. FTIR analysis and TGA showed that the initial oxidation rate and high thermal oxidation (ca. 375 °C) decreased with the addition of fullerenes. Ball on disk friction tests showed that fullerenes effectively reduced the friction coefficient, favored by smaller C60/70 clusters. The obtained results demonstrate that small fullerene clusters with high C70 content can be achieved without the addition of toluene in mineral oil and exhibit higher antioxidation, and lower friction coefficient. Thus, fullerenes could be of high interest as an additive for lubricant oils.

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“…Table 3 presents the relative viscosity of metal oxide-based nanofluids at several different temperatures. Xichen et al [58] experimentally investigated the effect of nanoparticle size on the viscosity of nanofluids. Two types of nanoparticles (Al 2 O 3 and ZnO) were added to engine oil with varying particle sizes from 20 nm to 100 nm with solid volume fractions ranging from 1% to 5%.…”

Section: Viscositymentioning

confidence: 99%

A Review on Thermophysical Property Assessment of Metal Oxide-Based Nanofluids: Industrial Perspectives

Sujith

Kim

2022

Metals

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Energy consumption in the industrial sector can be significantly reduced by improving heat transfer rates in heat exchanger circuits, pool boiling, metal cutting industries, etc. Numerous energy-related issues can be overcome to a large extent by improving heat flow properties by utilizing nanofluids. The present contribution reviews the improvement in thermophysical properties of metal oxide-based nanofluids. Key parameters affecting the thermophysical properties of nanofluids, such as particle volume fraction, temperature, particle size and various stabilizers, were reviewed. The importance of DLVO theory and zeta potential to control the electrostatic repulsion and pH values of nanofluids for stable nanofluid formulations were discussed. It has been observed that classical theories of thermal conductivity and viscosity cannot predict exact values for a wide range of variables. Therefore, various extensive correlations have been introduced to predict the thermophysical properties of nanofluids. In these correlations, individual dependent variables such as particle size, temperature, nanofluid layer thickness, and Brownian velocity of nanoparticles, etc. were considered for more accurate prediction. The heat transfer efficiencies of nanofluids to base fluids in the laminar and turbulent regimes have been discussed using various figures of merits. Finally, the scope of industrial applications of metal oxide-based nanofluids and future research opportunities have been discussed.

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Experimental investigation and mechanism analysis: Effect of nanoparticle size on viscosity of nanofluids

Cited by 37 publications

References 34 publications

Nanofluid as Advanced Cooling Technology. Success Stories

Nanofluid as Advanced Cooling Technology. Success Stories

Tuning Autoxidation and Friction of Mineral Oil by Fullerene Cluster Properties

A Review on Thermophysical Property Assessment of Metal Oxide-Based Nanofluids: Industrial Perspectives

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