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Effets de la séparation de la vapeur sur les transitions de phase d'un film tombant entre des tubes horizontaux.

Vapour shear effects on falling-film mode transitions between horizontal tubes.

Auteurs : RUAN B., JACOBI A. M., LI L.

Résumé

A liquid falling between horizontal tubes can take the form of droplets, jets, or a continuous sheet mode, depending on the flow rate. The so-called falling-film flow regime is important to heat and mass transfer, and to maintaining wetted-surface conditions in a falling-film tube bundle, and the performance of such tube bundles is important in many air-conditioning systems. In this paper, we review prior work on falling film mode transitions between horizontal tubes and investigate vapour shear effects on the mode transitions. It is shown that vapour shear effects on mode transitions depend on liquid properties. Mode transition hysteresis is reduced by an increasing gas flow velocity. It is also found that the liquid feeding length can have an impact on falling-film mode transitions.

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  • 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 : Vapour shear effects on falling-film mode transitions between horizontal tubes.
  • Identifiant de la fiche : 2009-0085
  • Langues : Anglais
  • Source : 2008 Purdue Conferences. 19th International Compressor Engineering Conference at Purdue & 12th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Date d'édition : 14/07/2008

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