Particle shape effects on thermophysical properties of alumina nanofluids

Timofeeva, Elena V.; Routbort, J.L.; Singh, Dileep

doi:10.1063/1.3155999

Cited by 801 publications

(395 citation statements)

References 30 publications

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“…[38][39][40][41] powerlaw distance-decaying functions have been chosen, resulting in a fractional-order heat conduction equation with some specific fractional operators [38][39][40][41]. Results have been found in agreement with non-classical thermodynamic behavior observed, for instance, in micro-and nano-devices [42][43][44].…”

Section: Introductionsupporting

confidence: 61%

The finite element method for fractional non-local thermal energy transfer in non-homogeneous rigid conductors

Zingales

Failla

2015

Communications in Nonlinear Science and Numerical Simulation

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a b s t r a c tIn a non-local fractional-order model of thermal energy transport recently introduced by the authors, it is assumed that local and non-local contributions coexist at a given observation scale: while the first is described by the classical Fourier transport law, the second involves couples of adjacent and non-adjacent elementary volumes, and is taken as proportional to the product of the masses of the interacting volumes and their relative temperature, through a material-dependent, distance-decaying power-law function. As a result, a fractional-order heat conduction equation is derived. This paper presents a pertinent finite element method for the solution of the proposed fractional-order heat conduction equation. Homogenous and non-homogeneous rigid bodies are considered. Numerical applications are carried out on 1D and 2D bodies, including a standard finite difference solution for validation.

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Section: Introductionsupporting

confidence: 61%

The finite element method for fractional non-local thermal energy transfer in non-homogeneous rigid conductors

Zingales

Failla

2015

Communications in Nonlinear Science and Numerical Simulation

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“…There are very few results available in the literature about the effect of particle shape on the viscosity of nanofluids [38,39]. However, viscosity has strong dependence on the particle shape.…”

Section: Effect Of Particle Size and Shapementioning

confidence: 98%

“…However, viscosity has strong dependence on the particle shape. Timofeeva et al [39] reported that elongated particles increase the viscosity of nanofluids rather than spherical nanoparticles. Ferrouillat et al [40] presented another interesting study on the influence of nanoparticle shape factor on convective heat transfer and performance of water-based SiO 2 and ZnO nanofluids.…”

Section: Effect Of Particle Size and Shapementioning

confidence: 99%

A brief review on viscosity of nanofluids

et al. 2014

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Since the past decade, rapid development in nanotechnology has produced several aspects for the scientists and technologists to look into. Nanofluid is one of the incredible outcomes of such advancement. Nanofluids (colloidal suspensions of metallic and nonmetallic nanoparticles in conventional base fluids) are best known for their remarkable change to enhanced heat transfer abilities. Earlier research work has already acutely focused on thermal conductivity of nanofluids. However, viscosity is another important property that needs the same attention due to its very crucial impact on heat transfer. Therefore, viscosity of nanofluids should be thoroughly investigated before use for practical heat transfer applications. In this contribution, a brief review on theoretical models is presented precisely. Furthermore, the effects of nanoparticles' shape and size, temperature, volume concentration, pH, etc. are organized together and reviewed.

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“…Timofeeva et al [65] found that the thermal conductivity was not significantly affected by aggregation, whereas, Wamkam et al [65,66] observed a significant enhancement of thermal conductivities (>20%) in 3 wt % suspensions when aggregation was most pronounced. Both groups suggest that the reason for the discrepancy lies in the nature and amount of the agglomeration: strong aggregates, which could lead to k eff enhancement; and aggregate-like ensembles, which occur due to weak repulsive forces between particles and are unlikely to enhance k eff because of the solidliquid-solid interfacial resistance.…”

Section: 1 1 T H E R M a L C O N D U C T I V I T Ymentioning

confidence: 99%

Heat Transfer Fluids

Lenert

Nam

Wang

2012

Annual Rev Heat Transfer

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The choice of heat transfer fluids has significant effects on the performance, cost and reliability of solar thermal systems. In this chapter, we evaluate existing heat transfer fluids such as oils and molten salts based on a new figure of merit capturing the combined effects of thermal storage capacity, convective heat transfer characteristics and hydraulic performance of the fluids.Thermal stability, freezing point and safety issues are also discussed. Through a comparative analysis, we examine alternative options for solar thermal heat transfer fluids including watersteam mixtures (direct steam), ionic liquids/melts and suspensions of nanoparticles (nanofluids), focusing on the benefits and technical challenges. DOI: 10.1615/AnnualRevHeatTransfer.2012004122 SOURCE: Lenert, Andrej, Youngsuk Nam, and Evelyn N. Wang. "Heat Transfer Fluids." Annual Review of Heat Transfer 15, 2012. 2 DOI: 10.1615/AnnualRevHeatTransfer.2012004122 SOURCE: Lenert, Andrej, Youngsuk Nam, and Evelyn N. Wang. "Heat Transfer Fluids." Annual Review of Heat Transfer 15, 2012. 3 V averaged bulk velocity (ms -1 )

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Particle shape effects on thermophysical properties of alumina nanofluids

Abstract: Effect of temperature on turbulent and laminar flow efficacy analysis of nanofluids

Cited by 801 publications

References 30 publications

The finite element method for fractional non-local thermal energy transfer in non-homogeneous rigid conductors

The finite element method for fractional non-local thermal energy transfer in non-homogeneous rigid conductors

A brief review on viscosity of nanofluids

Heat Transfer Fluids

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