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Ecoulement parallèle diphasique d'azote liquide descendant à l'intérieur d'un canal rectangulaire vertical.

The two-phase cocurrent downflow of liquid nitrogen in a vertical rectangular channel.

Auteurs : PAVLENKO A. N., PECHERKIN N. I., CHEKHOVICH V. Yu., et al.

Type d'article : Article

Résumé

Experimental results for liquid nitrogen film flow under gravity in a vertical rectangular channel with a narrow gap are presented. The Reynolds number for liquid was changed from 200 to 2000. The Reynolds number for vapour was changed from 0 to 20 000. The flow pattern was observed in an optical cryostat. Pictures and video records were made. A film thickness was measured on wide and narrow sides of the channel by means of the capacity method. The amplitude, shape, and frequency of waves as well as the average film thickness were determined. Observations and measurements of the film thickness demonstrated that the film thickness on the wide side decreased in comparison with Nusselt theory because some amount of liquid overflowed to the corners of the channel and the narrow sides. The interface was covered by a complex system of waves whose structure depends on liquid and vapour flow rates.

Détails

  • Titre original : The two-phase cocurrent downflow of liquid nitrogen in a vertical rectangular channel.
  • Identifiant de la fiche : 2004-1533
  • Langues : Anglais
  • Source : J. Eng. Thermophys. - vol. 11 - n. 4
  • Date d'édition : 2003
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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