Experimental characterization and modeling of thermophysical properties of nanofluids at high temperature conditions for heat transfer applications

The use of suspended nanoparticles in a base fluid has been practiced in the last years to increase its heat transfer capabilities. In this work, water based nanofluids of silica, alumina and carbon nanotubes were characterized regarding its later use in heat transfer applications. Well dispersed na...

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Bibliographic Details
Published in:Powder technology 2013-11, Vol.249, p.516-529
Main Authors: Mondragón, Rosa, Segarra, Carmen, Martínez-Cuenca, Raúl, Juliá, J. Enrique, Jarque, Juan Carlos
Format: Article
Language:English
Subjects:
aluminum oxide
Applied sciences
carbon nanotubes
Chemical engineering
Conductivity
Exact sciences and technology
Heat and mass transfer. Packings, plates
Heat transfer
Miscellaneous
Nanofluids
nanoparticles
silica
Solid-solid systems
specific heat
Stability
temperature
thermal conductivity
Viscosity
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Summary:The use of suspended nanoparticles in a base fluid has been practiced in the last years to increase its heat transfer capabilities. In this work, water based nanofluids of silica, alumina and carbon nanotubes were characterized regarding its later use in heat transfer applications. Well dispersed nanofluids were prepared at different volume fractions (up to 5v%) by dispersing the powder into the base fluid or by diluting commercial nanofluids acquired in suspension form. The thermal conductivity, the specific heat and the viscosity of all the prepared nanofluids were measured in order to optimize the Prandtl number and the heat transfer performance, at high temperature conditions (up to 80°C). Available models for these variables have been used to predict experimental data and the suitability of each one for the different sort of tested nanofluids has been obtained. Finally, the stability of the nanofluids was also studied through the evolution of the amount of light scattered by the sample during a period of time. [Display omitted] •Water-based SiO2, Al2O3 and CNT nanofluids have been prepared and characterized.•Measurements of thermal conductivity, viscosity, specific heat and stability•Measurements were carried out at different temperatures up to 80°C.•Evolution of physical properties with solid content has been modeled.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2013.08.035