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Influence de l'angle de contact sur la mouillabilité des films tombants à tubes horizontaux en mode gouttelette et jet.

Influence of the contact angle on the wettability of horizontal-tube falling films in the droplet and jet flow modes.

Auteurs : FERNANDEZ ARROIABE P., MARTINEZ-URRUTIA A., PEÑA X., et al.

Type d'article : Article, Article de la RIF

Résumé

Wettability has a key impact on the performance of LiBr-H2O horizontal-tube falling film absorbers working under typical operating conditions. Therefore, it is necessary to study the influence of the wettability properties on the film hydrodynamics and wetted area. This work analyses the influence of the contact angle (0–120°) on the transient film hydrodynamics and the wetted area in the droplet and jet flow modes (7?=?Re?=?53). The comparison between two-dimensional and three-dimensional models evidences that three-dimensional models are needed for incomplete wetting conditions. The influence of the contact angle on both the film hydrodynamics and wetted area is demonstrated using 3D unsteady CFD model. Furthermore, the results indicate that each Reynolds number has a maximum contact angle to wet the whole tube steadily. When the value of the contact angle is lower than this maximum value, the contact angle has not influence on the wetting ratio. In contrast, at higher values, the wetting ratio decreases as the contact angle increases.

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Format PDF

Pages : 12-21

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

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Détails

  • Titre original : Influence of the contact angle on the wettability of horizontal-tube falling films in the droplet and jet flow modes.
  • Identifiant de la fiche : 30023927
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 90
  • Date d'édition : 06/2018
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2018.04.003

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