Thermal conductivity of nanoparticle suspensions

Putnam, Shawn A.; Cahill, David G.; Braun, Paul V.; Ge, Zhong; Shimmin, Robert G.

doi:10.1063/1.2189933

Cited by 273 publications

(146 citation statements)

References 48 publications

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“…The same year dispersed multiwall carbon nanotubes (MWCNT) in water measuring an enhancement up to 160% at only 1% volume fraction of MWCNT. From this moment, there have been many studies in three kinds of nanoparticles dispersed in heat transfer fluids, namely metallic particles as aluminum (Al) (Murshed et al, 2008) and gold (Au) (Putnam et al, 2006), CNT Segarra et al, 2013;Xie et al, 2003), and non-metallic particles as silica (SiO 2 ), alumina (Al 2 O 3 ) and titania (TiO 2 ) (Murshed et al, 2005). The convective heat transfer coefficient has been also studied Kim et al, 2009a,b).…”

Section: Introductionmentioning

confidence: 99%

Characterization of halloysite-water nanofluid for heat transfer applications

Alberola

Mondragón

Juliá

et al. 2014

Applied Clay Science

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Versión / Versió:Postprint Nanofluids based on water with halloysite (Hal) nanotubes were prepared and characterized in order to evaluate its suitability to be used as a heat transfer fluid. A characterization of the Hal powder nanoparticles was performed by means of SEM, TEM, WAXS, FTIR and TGA so that chemical composition, size and shape were determined. Stability of nanofluids was analyzed by means of zeta potential and light transmission measurements. Thermal conductivity, specific heat and viscosity of nanofluids prepared at different solid contents (0.5, 1, 3 and 5% volume fraction) and temperatures (40, 60 and 80°C) were obtained in order to optimize the Prandtl number. The nanofluids exhibited a good performance for its application as heat transfer fluids, with low Prandtl numbers compared to other commonly used nanofluids. High thermal conductivity enhancement with moderate viscosity and good stability results was obtained for the Hal nanofluid.

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Section: Introductionmentioning

confidence: 99%

Characterization of halloysite-water nanofluid for heat transfer applications

Alberola

Mondragón

Juliá

et al. 2014

Applied Clay Science

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“…The surface charge is one of the primary factors controlling nanoparticle aggregation. Furthermore, Cahill and collaborators 13 demonstrated that nanofluids exhibiting good dispersion do not show any unusual enhancement of thermal conductivity.…”

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confidence: 99%

Effect of aggregation on thermal conduction in colloidal nanofluids

Prasher

Evans

Meakin

et al. 2006

Applied Physics Letters

362

207

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Using effective medium theory the authors demonstrate that the thermal conductivity of nanofluids can be significantly enhanced by the aggregation of nanoparticles into clusters. Predictions of the effective medium theory are in excellent agreement with detailed numerical calculation on model nanofluids involving fractal clusters and show the importance of cluster morphology on thermal conductivity enhancements.

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“…Nanometer-sized stable metal, metal oxides or carbon particles in various forms could be suspended in the industrial heat transfer fluids (water and organic liquids), and can result in anomalously large enhancements of the thermal conductivities. [1][2][3][4][5] These reports show that only 5 vol. % of nanoparticles such as alumina (Al 2 O 3 ), copper oxide (CuO), and copper (Cu) dispersed in different base fluids, the thermal conductivity of the nanofluids was observed a significant improvement ($60%) as compared to the corresponding base fluids.…”

Section: Introductionmentioning

confidence: 99%

Near-Field Nanofluid Concentration Measurement by Rayleigh Particle Scattering Bragg Grating Evanescent Wave

2014

International Journal of Optomechatronics

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We report an approach to detect near-field nanofluid concentration by scattering Bragg grating evanescent wave (EW). Since the suspended nanoparticles can enhance the scattering intensity of the EW from the thinned and tapered fiber with Bragg grating, the reflectance ratio of Bragg grating is dependent on the corresponding refractive index (RI) of the nanofluid at different nanoparticle volume fraction. A critical reflectance ratio measurement identifies the nanofluid concentration. Theory and simulation of scattering Bragg grating EW was analyzed. The scattering Bragg grating EW fiber sensing probe was designed and fabricated by the wet chemical etching method, and calibration was made by several chemical solutions without suspended nanoparticles. The example application of the nanofluid containing dispersed 40 nm SiO 2 nanoparticles demonstrates the feasibility. The reflectance ratio decreases by over 3.2% with the nanofluid concentration increasing from 0.25 wt.% to 4 wt.%, while the temperature disturbance can be negligible.

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Thermal conductivity of nanoparticle suspensions

Cited by 273 publications

References 48 publications

Characterization of halloysite-water nanofluid for heat transfer applications

Characterization of halloysite-water nanofluid for heat transfer applications

Effect of aggregation on thermal conduction in colloidal nanofluids

Near-Field Nanofluid Concentration Measurement by Rayleigh Particle Scattering Bragg Grating Evanescent Wave

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