Structure and rheology of SiO2 nanoparticle suspensions under very high shear rates.
Phys Rev E Stat Nonlin Soft Matter Phys
; 80(5 Pt 1): 051403, 2009 Nov.
Article
en En
| MEDLINE
| ID: mdl-20364981
High shear rate experiments have been performed with capillary microviscometers onto SiO2 nanoparticles dispersed in alcohol (so-called nanofluids). The aim of these experiments was to investigate the processes of aggregation and dislocation of the nanoparticles in a shear flow under perikinetic and orthokinetic conditions. Shear rates as high as 2x10(5) s-1 were obtained in pressure-driven microchannels laminar flows. All the nanofluids under test have displayed a Newtonian behavior but with a strong enhanced viscosity, that is, the consequence of an effective volume concentration higher than the real one. It was possible to determine the average size of the aggregates and to find a correlation between their structure and the range of the hydrodynamic Peclet number at which experiments were performed. These results display a strong evidence of the role of aggregates and support the recent conclusions about the controversy of the thermal properties of nanofluids.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Reología
/
Suspensiones
/
Dióxido de Silicio
/
Nanopartículas
/
Modelos Químicos
Idioma:
En
Revista:
Phys Rev E Stat Nonlin Soft Matter Phys
Asunto de la revista:
BIOFISICA
/
FISIOLOGIA
Año:
2009
Tipo del documento:
Article
País de afiliación:
Francia
Pais de publicación:
Estados Unidos