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Impact of roughness of a nickel metallic surface on the supercooling degree of a water-ethanol aqueous solution.

Author(s) : FAUCHEUX M., HAVET M., LEBAIL A.

Summary

This paper presents a study on the impact of the roughness of a metallic surface on the magnitude of the supercooling degree during freezing of an aqueous solution. Nickel surfaces of known roughness ranging from 0.05 to 12.5 micro-m were used. An aqueous solution of ethanol (5% w/w) was considered as a model solution. On each surface, a 20 micro-l droplet was crystallized. A thermocouple in each droplet permitted to measure the supercooling degree when phase change occurred. In our conditions, the supercooling degree was between 4.9 and 17°C. The authors showed that roughness has a strong influence on the supercooling phenomena, confirming that the lower the roughness, the higher the supercooling. A power law trend was observed between the roughness and the supercooling. Moreover, experimental results pointed out that this dependency is more sensitive for roughness less than 3.2 micro-m.

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Pages: 2006-4

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Details

  • Original title: Impact of roughness of a nickel metallic surface on the supercooling degree of a water-ethanol aqueous solution.
  • Record ID : 2007-0203
  • Languages: English
  • Source: 7th Conference on Phase-Change Materials and Slurries
  • Publication date: 2006/09/13

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