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

Author(s) : KUMANO H., HIRATA T., KUDOH T.

Summary

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.

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Pages: pp. 494-499

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Details

  • Original title: Study on effects of PVA (polyvinyl alcohol) on supercooling phenomena of water.
  • Record ID : 2009-2241
  • Languages: English
  • Source: ACRA-2009. The proceedings of the 4th Asian conference on refrigeration and air conditioning: May 20-22, 2009, Taipei, R.O.C.
  • Publication date: 2009/05/20

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