Rheology of concentrated disperse systems and minimum energy dissipation principle

Quemada, D.

doi:10.1007/bf01516932

Cited by 501 publications

(273 citation statements)

References 35 publications

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“…Viscosity ratio was calculated from nanofluid and base fluid viscosities (η nf and η bf respectively). The viscosity of the nanofluid increases with solid content according to the models available in literature (Quemada, 1977). As the solid content increases, there exists more interaction between particles so that clusters are formed providing a higher viscosity.…”

Section: Thermophysical Properties Of Nanofluidsmentioning

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: Thermophysical Properties Of Nanofluidsmentioning

confidence: 99%

Characterization of halloysite-water nanofluid for heat transfer applications

Alberola

Mondragón

Juliá

et al. 2014

Applied Clay Science

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“…It is shown that the only variable that has a significant effect in the range of variables studied is the solid content, which has a positive effect, as can be seen in Figure 7. It is known that the viscosity of a suspension increases on adding solid particles due to the hydrodynamic interactions as well as the colloidal interactions that take place in the fluid flow [28][29][30][31]. It can be seen that on increasing the solid mass load from 0.02 to 0.10 there is no significant increase, but when raised from 0.10 to 0.20 the viscosity rises significantly due to the increase in the interactions and collisions among particles that lead to the formation of agglomerates.…”

Section: Viscosity ηmentioning

confidence: 99%

Characterization of silica–water nanofluids dispersed with an ultrasound probe: A study of their physical properties and stability

et al. 2012

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of silica-water nanofluids dispersed with an ultrasound probe: A study of their physical properties and stability. Powder Technology, 2012, Vol. 224 AbstractThe stability and agglomeration state of nanofluids are key parameters for their use in different applications. Silica nanofluids were prepared by dispersing the nanoparticles in distilled water using an ultrasonic probe, which has proved to be the most effective system and gives the best results when compared with previous works. Results were obtained concerning the influence of the solid content, pH and salt concentration on the zeta potential, electrical double layer, viscosity, elastic and viscous moduli, particle size and light backscattering. Measurement of all these properties provides information about the colloidal state of nanofluids. The most important variable is the solid content.Despite the agglomeration due to high concentration, nanofluids with low viscosity and behaving like liquid were prepared at 20% of mass load thanks to the good dispersion achieved with the ultrasonic treatment. The pH of the medium can be used to control the stability, since the nanofluids are more stable under basic conditions far from the isoelectric point (IEP) and settle at pH = 2. Therefore, stable nanofluids for at least 48 h, with high solid content, can be prepared at high pH value (pH > 7) due to the electrostatic repulsion between particles.

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“…The Quemada Equation (5) is on the basis of particles' interactions and their different morphologies (Quemada, 1977).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Piezoresistivity and Mechanical Behavior of Metal-polymer Composites under Uniaxial Pressure

Abyaneh¹,

Ekar²,

Kulkarni³

2012

JMSR

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The piezoresistive response of copper and nickel particles reinforced polydimethylsiloxane (PDMS) polymer, forming metal-polymer composites were investigated under uniaxial pressure. Electrical and mechanical properties of composite samples containing Cu and Ni conductive fillers at different loadings in polydimethylsiloxane (PDMS) polymer matrix have been presented here. Well-dispersed metal-polymer composites were fabricated by a wet mixing route. The resulting Cu-PDMS and Ni-PDMS composite samples show the resistivity changes by more than 2 and 10 orders of magnitude around 4MPa pressure, respectively. The mechanical tests have shown that these composite samples have high stress sensitivity which makes them good piezoresistive candidates for practical applications.

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Rheology of concentrated disperse systems and minimum energy dissipation principle

Cited by 501 publications

References 35 publications

Characterization of halloysite-water nanofluid for heat transfer applications

Characterization of halloysite-water nanofluid for heat transfer applications

Characterization of silica–water nanofluids dispersed with an ultrasound probe: A study of their physical properties and stability

Piezoresistivity and Mechanical Behavior of Metal-polymer Composites under Uniaxial Pressure

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