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Document IIF

Films tombants : de l'hydrodynamique aux calculs du transfert de matière.

From measurements of hydrodynamics to computation of species transport in falling films.

Auteurs : SUBRAMANIAM V., GARIMELLA S.

Type d'article : Article, Article de la RIF

Résumé

Falling films on horizontal tube banks are widely used in absorption heat pumps. Liquid film heat and mass transfer models in the literature are based on simplistic assumptions about such flows. Droplets forming under the tubes fall on subsequent tubes, and the ensuing waviness and mixing on the liquid film affect absorption. High-speed flow visualization, image analysis, and computations are used to understand the effect of hydrodynamics on local absorption phenomena. Image analysis mathematically describes the interface, and the surface area and volume of the droplets. These flows are also numerically analyzed using the volume-of-fluid method for the liquid-vapour interface. The 3-D model corroborates with high fidelity the droplet formation, detachment and impact observed in experiments. Fully resolved 3-D computations of the coupled fluid flow and heat and mass transfer reveal the local gradients and transfer rates, and their spatial and temporal variations in the falling-film and inter-tube regions.

Documents disponibles

Format PDF

Pages : 607-626

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : From measurements of hydrodynamics to computation of species transport in falling films.
  • Identifiant de la fiche : 2009-1558
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 4
  • Date d'édition : 06/2009

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