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Etude des effets du PVA (alcool polyvinylique) sur le phénomène de surfusion d'eau.

Study on effects of PVA (polyvinyl alcohol) on supercooling phenomena of water.

Auteurs : KUMANO H., HIRATA T., KUDOH T.

Résumé

In this paper, effects of polymer additive on supercooling of water were investigated experimentally. Polyvinyl alcohol (PVA) were used as the additives, and the samples were prepared by dissolving PVA in water. Since characteristics of PVA are decided by degree of polymerization and saponification of PVA, concentration, degree of polymerization and saponification of PVA were varied as the experimental parameters. Moreover, effects of purity of the water was also considered. The sample was cooled, and the temperature at the instant when ice appears was measured. Since freezing of supercooled water is statistical phenomenon, many experiments were carried out and average degrees of supercooling were obtained for each experimental condition. As the result, it was found that PVA affects nucleation of supercooling and the degree of supercooling increases by adding the PVA despite of low purity of the water. Especially, it is found that the average degree of supercooling increases with increase of degree of saponification of PVA. However, the average degree of supercooling are independent of the degree of polymerization of PVA in the range of this study.

Documents disponibles

Format PDF

Pages : pp. 494-499

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Study on effects of PVA (polyvinyl alcohol) on supercooling phenomena of water.
  • Identifiant de la fiche : 2009-2241
  • Langues : Anglais
  • Source : ACRA-2009. The proceedings of the 4th Asian conference on refrigeration and air conditioning: May 20-22, 2009, Taipei, R.O.C.
  • Date d'édition : 20/05/2009

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