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

Peru Fernández de Arroiabe, Asier Martinez-Urrutia, Xabier Peña, Manex Martinez-Agirre, M. Mounir Bou-Ali

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

32 Citas (Scopus)

Resumen

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.
Idioma originalInglés
Páginas (desde-hasta)12-21
Número de páginas10
PublicaciónInternational Journal of Refrigeration
Volumenunknown
DOI
EstadoPublicada - jun 2018

Palabras clave

  • Absorption technologies
  • Water-lithium bromide
  • Falling film
  • Contact angle
  • Wettability
  • CFD

Project and Funding Information

  • Funding Info
  • The authors would like to express their gratitude for the support of BEROA-GO 3.0 and research groups (No. IT009-16)

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