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The role of several heat transfer mechanisms on the enhancement of thermal conductivity in nanofluids

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Abstract

A modelling of the thermal conductivity of nanofluids based on extended irreversible thermodynamics is proposed with emphasis on the role of several coupled heat transfer mechanisms: liquid interfacial layering between nanoparticles and base fluid, particles agglomeration and Brownian motion. The relative importance of each specific mechanism on the enhancement of the effective thermal conductivity is examined. It is shown that the size of the nanoparticles and the liquid boundary layer around the particles play a determining role. For nanoparticles close to molecular range, the Brownian effect is important. At nanoparticles of the order of 1–100 nm, both agglomeration and liquid layering are influent. Agglomeration becomes the most important mechanism at nanoparticle sizes of the order of 100 nm and higher. The theoretical considerations are illustrated by three case studies: suspensions of alumina rigid spherical nanoparticles in water, ethylene glycol and a 50/50w% water/ethylene glycol mixture, respectively, good agreement with experimental data is observed.

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  1. Thermodynamics of Irreversible Phenomena, University of Liège, Allée du 6-Août, 19, 4000, Liège, Belgium

    H. Machrafi & G. Lebon

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  1. H. Machrafi
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  2. G. Lebon
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Communicated by Andreas Öchsner.

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Machrafi, H., Lebon, G. The role of several heat transfer mechanisms on the enhancement of thermal conductivity in nanofluids. Continuum Mech. Thermodyn. 28, 1461–1475 (2016). https://doi.org/10.1007/s00161-015-0488-4

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