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An explanation of the Al2O3 nanofluid thermal conductivity based on the phonon theory of liquid

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  • Iacobazzi, Fabrizio
  • Milanese, Marco
  • Colangelo, Gianpiero
  • Lomascolo, Mauro
  • de Risi, Arturo

Abstract

In the present work a systematic investigation on several mechanisms affecting the thermal conductivity of Alumina based nanofluid, such as layering, Brownian motion, clustering, ballistic phonon motion, thermal boundary resistance and mass difference scattering, is presented. The effect of mass difference scattering is for the first time suggested and studied in the present work. Both theoretical and experimental approaches have been carried out in order to analyze the competition of these phenomena and to identify the most relevant. This was obtained by comparing micrometric and nanometric particles suspended in liquid water (293 K), frozen water (253 K) and diathermic oil (293 K). Each of the above-mentioned conditions was selected to make dominant only one of the mechanisms that affect nanofluid thermal conductivity. The main results of this investigation concern the mass difference scattering, which has been found to be the most intensive mechanism reducing the nanofluid thermal conductivity with respect to the microfluid one.

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  • Iacobazzi, Fabrizio & Milanese, Marco & Colangelo, Gianpiero & Lomascolo, Mauro & de Risi, Arturo, 2016. "An explanation of the Al2O3 nanofluid thermal conductivity based on the phonon theory of liquid," Energy, Elsevier, vol. 116(P1), pages 786-794.
    • Handle: RePEc:eee:energy:v:116:y:2016:i:p1:p:786-794
    DOI: 10.1016/j.energy.2016.10.027
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    1. Colangelo, Gianpiero & Favale, Ernani & de Risi, Arturo & Laforgia, Domenico, 2012. "Results of experimental investigations on the heat conductivity of nanofluids based on diathermic oil for high temperature applications," Applied Energy, Elsevier, vol. 97(C), pages 828-833.
    2. Bianco, Vincenzo & Manca, Oronzio & Nardini, Sergio, 2014. "Performance analysis of turbulent convection heat transfer of Al2O3 water-nanofluid in circular tubes at constant wall temperature," Energy, Elsevier, vol. 77(C), pages 403-413.
    3. Lomascolo, Mauro & Colangelo, Gianpiero & Milanese, Marco & de Risi, Arturo, 2015. "Review of heat transfer in nanofluids: Conductive, convective and radiative experimental results," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 1182-1198.
    4. Tsang, Eric W. K., 2014. "Old and New," Management and Organization Review, Cambridge University Press, vol. 10(03), pages 390-390, November.
    5. Colangelo, Gianpiero & Favale, Ernani & Miglietta, Paola & Milanese, Marco & de Risi, Arturo, 2016. "Thermal conductivity, viscosity and stability of Al2O3-diathermic oil nanofluids for solar energy systems," Energy, Elsevier, vol. 95(C), pages 124-136.
    6. Solangi, K.H. & Kazi, S.N. & Luhur, M.R. & Badarudin, A. & Amiri, A. & Sadri, Rad & Zubir, M.N.M. & Gharehkhani, Samira & Teng, K.H., 2015. "A comprehensive review of thermo-physical properties and convective heat transfer to nanofluids," Energy, Elsevier, vol. 89(C), pages 1065-1086.
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