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Heat transfer characteristics in a concentric-tube closed thermosyphon.

[In Japanese. / En japonais.]

Author(s) : KAWABE H., TANAKA T., FUKUSAKO S.

Type of article: Article

Summary

An experimental study was performed to investigate the heat-transfer characteristics in a concentric-tube closed thermosyphon in which boiling and free convection take place. The outer tube of the thermosyphon used in this study was 100 mm in diameter and 3420 mm in height, consisting of both some individual electrical-heating copper tubes of 330 mm in length and lucite tubes of 60 mm in length. Inner copper tubes of 41.3 mm and 66.6 mm in diameter and 3270 mm in length were used. Experiments were carried out under constant wall-surface temperature conditions, and refrigerant R11 was utilized as a testing fluid. Out of a number of possible controlling variables, the effect of the heat flux, the void fraction, the ratio of heating length to the total test section length, and the diametric ratio of the concentric tube on the heat-transfer performance were determined.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 1993-0175
  • Languages: Japanese
  • Source: Trans. JAR - vol. 8 - n. 2
  • Publication date: 1991
  • Document available for consultation in the library of the IIR headquarters only.

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