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Experimental study of frost formation on straight cylindrical fins of cryogenic temperature under natural convection conditions.

Author(s) : CHEN Y., LIU Z., YU F., LI Y.

Type of article: IJR article

Summary

Frost deposition phenomena on cryogenic cold surfaces are receiving more and more attention from both researchers and various industries. However, frost formation on fins of cryogenic temperature has been not touched. Therefore, an experimental system of frost deposition on straight cylindrical fins with fin base temperature as low as -190 °C under natural convection conditions was established and a series of frost formation experiments under various conditions were carried out to analyze the characteristics and influence factors of frost formation. The results show that due to the change of frost formation mechanism, the frost formation on the fin is greatly different under different temperature ranges. The distribution of the frost layer thickness on the fins at cryogenic temperature is more uneven along both the fin axial and circumferential directions, and this characteristic is more significant in the early frost stage. The frost formation mechanism changes not only with the base temperature, but also along the fin length when the base temperature is low enough. For low fin base temperatures, say -190 °C, liquid air appears at the fin base, which will lead to no frost in the near-fin-base region for a long time, and lowering the fin base temperature will decrease frost layer thickness. The size of the near-fin-base region increases as the fin base temperature decreases. In addition, increasing air relative humidity or air temperature without changing other conditions will accelerate frost formation. The results also show that fin materials strongly affect the distribution of frost layer on fins.

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Pages: 51-59

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Details

  • Original title: Experimental study of frost formation on straight cylindrical fins of cryogenic temperature under natural convection conditions.
  • Record ID : 30029364
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 135
  • Publication date: 2022/03
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2021.12.020
  • Document available for consultation in the library of the IIR headquarters only.

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