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Propriétés thermophysiques des nano-émulsions utilisées comme matériaux d'accumulation thermique

Thermophysical properties of nanoemulsions as a thermal storage material.

Numéro : pap. ID: 405

Auteurs : FUMOTO K., KAWAJI M., KAWANAMI T.

Résumé

Latent functionally thermal fluids such as phase-change emulsions and microcapsule slurries are a novel kind of heat storage and heat transfer fluids. In this paper, thermophysical properties such as thermal conductivity, viscosity, and density of a nanoemulsion were discussed in the context of its use as a thermal storage material. Milky-white oil-in-water nanoemulsions were formed in distilled water/Tween 80 + Span 80/tetradecane by a low-energy emulsification method (e.g., phase inversion temperature method). The results showed that the viscosity of the nanoemulsion, which was prepared at an identical surfactant mixing ratio and phase-change material concentration as that of conventional emulsions, is lower than the viscosity of conventional emulsions. The surfactant concentration was found to contribute to the stability of the phase-change nanoemulsion. Moreover, it was clarified that Maxwell’s equation could be applied to the estimation of thermal conductivity of the nanoemulsion. Useful correlations among the thermal properties of the nanoemulsion (e.g., the temperature and concentration ratio of the constituents of the nanoemulsion) were determined.

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Pages : 8 p.

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Détails

  • Titre original : Thermophysical properties of nanoemulsions as a thermal storage material.
  • Identifiant de la fiche : 30002926
  • Langues : Anglais
  • Source : Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Date d'édition : 21/08/2011

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