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Mécanismes d'écoulement dominants dans les modes d'évaporation à film tombant et par gouttelettes sur des nappes de tubes rectangulaires horizontaux.

Dominant flow mechanisms in falling-film and droplet mode evaporation over horizontal tectangular tube banks.

Numéro : pap. 2491

Auteurs : BUSTAMANTE J. G., GARIMELLA S.

Résumé

Flow visualization with high-speed video of evaporating water films falling over flat horizontal tubes, representative of the external surfaces of microchannel tubes, is presented. Experiments were conducted with 1.4 mm thick and 27 mm tall tubes over a film Reynolds number range of 23 < Re < 126. In addition to a qualitative description of the flow mechanisms, this work quantifies key droplet and wave characteristics using image analysis techniques. A semi-autonomous edge-detection technique is used to develop a mathematical description of the droplets and waves, allowing the surface area, volume, velocity, and frequency of the droplets, as well as the width, surface area, and velocity of the waves, to be measured. The results are useful for developing accurate, phenomena-based models for falling-film evaporation over flat horizontal tube banks.

Documents disponibles

Format PDF

Pages : 10 p.

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

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

Détails

  • Titre original : Dominant flow mechanisms in falling-film and droplet mode evaporation over horizontal tectangular tube banks.
  • Identifiant de la fiche : 30006322
  • Langues : Anglais
  • Source : 2012 Purdue Conferences. 14th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 16/07/2012

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