Experimental study on the characteristics of thermal conductivity and shear viscosity of viscoelastic-fluid-based nanofluids containing multiwalled carbon nanotubes

Li, Feng-Chen; Yang, Juan-Cheng; Zhou, Wenwu; He, Yurong; Huang, Yimin; Jiang, Baocheng

doi:10.1016/j.tca.2013.01.023

Cited by 75 publications

(23 citation statements)

References 26 publications

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“…The reduction of the particle surface energy as a result of temperature increase would decrease the agglomeration of nanoparticles, and the reduction of viscosity would improve the Brownian motion. By taking into account the effects of the nano-scale, the effects of the interfacial interaction between nanoparticles and liquid as well as Brownian motion, the model was expressed as Li et al [93] modified Li-Qu-Feng [91] model in order to calculate thermal conductivity of CNTs nanofluids. They showed that Li-Qu-Feng [91] model underestimates the experiment results and is unable to predict thermal conductivity of CNTs nanofluids while no shape factor was included into the model for the special shape of CNTs.…”

Section: Hybrid Model and Other Effectsmentioning

confidence: 99%

A Review of Thermal Conductivity Models for Nanofluids

Aybar

Sharifpur

Azizian

et al. 2015

Heat Transfer Engineering

203

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Section: Hybrid Model and Other Effectsmentioning

confidence: 99%

A Review of Thermal Conductivity Models for Nanofluids

Aybar

Sharifpur

Azizian

et al. 2015

Heat Transfer Engineering

203

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“…where SH is the shape factor and assuming the spherical shape of nanoparticle, the factor can be taken as 3 (Li et al 2013). …”

Section: Efficiency Analysis Of Nanofluid-based Flat-plate Solar Collmentioning

confidence: 99%

Energy, economic, and environmental analysis of a flat-plate solar collector operated with SiO2 nanofluid

Faizal

Saidur

Mekhilef

et al. 2014

Clean Techn Environ Policy

104

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To overcome the environmental impact and declining source of fossil fuels, renewable energy sources need to meet the increasing demand of energy. Solar thermal energy is clean and infinite, suitable to be a good replacement for fossil fuel. However, the current solar technology is still expensive and low in efficiency. One of the effective ways of increasing the efficiency of solar collector is to utilize high thermal conductivity fluid known as nanofluid. This research analyzes the impact on the performance, fluid flow, heat transfer, economic, and environment of a flat-plate solar thermal collector by using silicon dioxide nanofluid as absorbing medium. The analysis is based on different volume flow rates and varying nanoparticles volume fractions. The study has indicated that nanofluids containing small amount of nanoparticles have higher heat transfer coefficient and also higher energy and exergy efficiency than base fluids. The measured viscosity of nanofluids is higher than water but it gives negligible effect on pressure drop and pumping power. Using SiO 2 nanofluid in solar collector could also save 280 MJ more embodied energy, offsetting 170 kg less CO 2 emissions and having a faster payback period of 0.12 years compared to conventional water-based solar collectors.

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“…Our previous experimental results and numerical simulation results have proved that the VFBN (the aqueous solution of CTAC/sodium salicylate (NaSal) system is used as viscoelastic base fluid, copper is used as nanoparticles) can realize the flow drag reduction effects compared with traditional nanofluid and the heat transfer enhancement compared with viscoelastic fluid. Some detailed experimental results and simulation results of VFBN can be seen in our previous publications [35][36][37][38][39]. Following the similar analysis procedure of nanofluid used by FSP, it is also valuable to investigate the synergy between the velocity filed and temperature gradient filed of VFBN under turbulent flow state.…”

Section: Introductionmentioning

confidence: 98%

Analysis of heat transfer performance for turbulent viscoelastic fluid-based nanofluid using field synergy principle

Yang

et al. 2015

Sci. China Technol. Sci.

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In this paper, the field synergy principle is firstly performed on the viscoelastic fluid-based nanofluid and other relevant fluid in channel at turbulent flow state to scrutinize their heat transfer performance based on our direct numerical simulation database. The cosine values of intersection angle between velocity vector and temperature gradient vector are calculated for different simulated cases with varying nanoparticle volume fraction, nanoparticle diameter, Reynolds number and Weissenberg number. It is found that the filed synergy effect is enhanced when the nanoparticle volume fraction is increased, nanoparticle diameter is decreased and Weissenberg number is decreased, i.e. the heat transfer is also enhanced. However, the filed synergy effect is weakened with the increase of Reynolds number which may be the possible reason for the power function relationship in empirical correlation of heat transfer between heat transfer performance and Reynolds number with the constant power exponent lower than 1. Finally, it is also observed that the field synergy principle can be used to analyze the heat transfer process of viscoelastic fluid-based nanofluid at the turbulent flow state even if some negative cosine values of intersection angle exist in the flow field. viscoelastic fluid-based nanofluid, filed synergy principle, intersection angle, turbulent drag reduction, heat transfer enhancement Citation:Yang J C, Li F C, Ni M J, et al. Analysis of heat transfer performance for turbulent viscoelastic fluid-based nanofluid using field synergy principle.

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Experimental study on the characteristics of thermal conductivity and shear viscosity of viscoelastic-fluid-based nanofluids containing multiwalled carbon nanotubes

Cited by 75 publications

References 26 publications

A Review of Thermal Conductivity Models for Nanofluids

A Review of Thermal Conductivity Models for Nanofluids

Energy, economic, and environmental analysis of a flat-plate solar collector operated with SiO2 nanofluid

Analysis of heat transfer performance for turbulent viscoelastic fluid-based nanofluid using field synergy principle

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