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Sous-refroidissement dans des émulsions d'hexadécane.

Subcooling in hexadecane emulsions.

Auteurs : GÜNTHER E., SCHMID T., MEHLING H., et al.

Résumé

When a liquid starts to solidify only when cooled well below its melting temperature, this is called subcooling. From nucleation theory, subcooling is expected to increase for small volumes due to statistics and seed isolation effects. PCM emulsions are superior in their heat transfer rates compared to larger PCM modules. In principle, the smaller the droplets, the larger is the risk for significant subcooling. Due to the limitations of theoretic models, it is necessary to use experimental investigations to predict from what droplet size on subcooling becomes problematic in a PCM. In this paper, the authors present an experimental study on subcooling in hexadecane emulsions. Different hexadecane-water-surfactant systems with droplet size in the range of about 0.1 to 20 micrometers were prepared and analyzed. The authors have observed an increased subcooling of at least 10 K for small droplets. The surfactants also have an impact on the melting and solidification temperatures.

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Pages : 2009-4

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Détails

  • Titre original : Subcooling in hexadecane emulsions.
  • Identifiant de la fiche : 2009-1654
  • Langues : Anglais
  • Source : 8th Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning
  • Date d'édition : 03/06/2009

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