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Amélioration du transfert de masse par des ondes dans un film liquide tombant à l'intérieur d'un tube vertical.

Wave-augmented mass transfer in a liquid film falling inside a vertical tube.

Auteurs : PARK C. D., NOSOKO T., GIMA S., et al.

Type d'article : Article

Résumé

Uniformly distributed water films were formed inside vertical tubes, and partial disintegrations of hump-like surface waves into clusters of dimples were observed on the films at the Reynolds number more or less 40 and larger, associated with marked deceleration of mass-transfer augmentation. In about 1 m or taller films with the uniform distribution, two empirical correlations between the Sherwood number and Reynolds number at the ranges of Reynolds number= 20-40 and 40-400 were constructed. The transition to turbulent flow occurs in the films with decelerating inlet flow in the range of Reynolds number= 400-700 where the Sherwood number sharply rises, suggesting that the laminar developing entry region rapidly shortens and almost disappears, though the region had been observed only in film flow measurements. Periodic perturbations imposed on the inlet flow trigger tall humps close to the inlet, causing the laminar developing region to vanish and the critical Reynolds number to drop from 400 to about 300.

Détails

  • Titre original : Wave-augmented mass transfer in a liquid film falling inside a vertical tube.
  • Identifiant de la fiche : 2004-2165
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 47 - n. 12-13
  • Date d'édition : 06/2004

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