Subcooling in hexadecane emulsions / E. Günther in International journal of refrigeration, Vol. 33 N° 8 (Décembre 2010)  

Public ISBD [article]  inInternational journal of refrigeration > Vol. 33 N° 8 (Décembre 2010) . - pp. 1605-1611 Titre : Subcooling in hexadecane emulsions Titre original : Sous-refroidissement des émulsions d'hexadécane Type de document : texte imprimé Auteurs : E. Günther, Auteur ; T. Schmid, Auteur ; H. Mehling, Auteur Année de publication : 2011 Article en page(s) : pp. 1605-1611 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Subcooling Latent heat Paraffin Emulsion Phase change-material Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération 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, we present an experimental study on subcooling in hexadecane emulsions. Different hexadecane–water–surfactant systems with droplet size in the range of about 0.1–20 μm were prepared and analyzed. We 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. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710001684 [article] Subcooling in hexadecane emulsions = Sous-refroidissement des émulsions d'hexadécane [texte imprimé] / E. Günther, Auteur ; T. Schmid, Auteur ; H. Mehling, Auteur . - 2011 . - pp. 1605-1611. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 8 (Décembre 2010) . - pp. 1605-1611 Mots-clés : Subcooling Latent heat Paraffin Emulsion Phase change-material Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération 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, we present an experimental study on subcooling in hexadecane emulsions. Different hexadecane–water–surfactant systems with droplet size in the range of about 0.1–20 μm were prepared and analyzed. We 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. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710001684

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