Frost deposition on cooled surfaces under reduced pressure

Satoshi Fukada, Kunihiro Inoue, Masabumi Nishikawa

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Abstract

Deposition rates and growth rates of frost on cooled surfaces under reduced pressure were obtained by using a freezing apparatus to reproduce natural convection where an upper surface was cooled at constant temperature and water was evaporated from a lower surface. It was designed for a basic study of a cryogenic freezer proposed for a fuel clean-up system of a fusion reactor. The experiment was carried out in the ranges of 6 × 102 Pa to 1 × 105 Pa of total pressure and 77 K to 261 K of the cooling temperature. Sh numbers at the initial stage of frosting could be fitted to values evaluated using a conventional correlation of natural convection multiplied by a factor based on the critical supersaturation model. Frost thickness and average frost density under reduced pressure grew with the square root of time. In addition, frost thickness increased with [(Ts1-Tw1)t]0.5 over all the ranges of the experimental conditions except where frost melted on the interface. The difference in frost thickness with the total pressure was qualitatively correlated by a parameter which was defined by the ratio of latent heat flux to sensitive heat flux.

Original languageEnglish
Pages (from-to)166-172
Number of pages7
Journalkagaku kogaku ronbunshu
Volume21
Issue number1
DOIs
Publication statusPublished - Jan 1 1995

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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