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Evaporation éclair d'un film d'eau : impact de la hauteur du liquide et de la vitesse de dépressurisation.

Flash evaporation from a water pool: influence of the liquid height and of the depressurization rate.

Auteurs : SAURY D., HARMAND S., SIROUX M.

Type d'article : Article

Résumé

This article presents a study about the influence of the initial water height and of the depressurization rate on the flash evaporation of a water film. An experimental study is carried out with initial water height ranging from 25 to 250 mm, superheats between 2 and 44 K, and an initial liquid temperature from 45 to 85 °C. The visualization of the phenomenon using a CCD camera points out the influence of the initial water level on the flashing phenomenon in a qualitative way. The thermal balance allows the authors to correlate the mass evaporated with the liquid temperature, and then to quantify the influence of the initial water height on several parameters: maximal amplitude of the phenomenon, flashing time and liquid mass evaporated. The authors also analyse the influence of relatively low depressurization rate (from 0 to 3.5 bars) on the flashing time, the mass evaporated, and the mass flow rate. Finally, dimensionless correlations between these parameters are proposed.

Détails

  • Titre original : Flash evaporation from a water pool: influence of the liquid height and of the depressurization rate.
  • Identifiant de la fiche : 2006-0633
  • Langues : Anglais
  • Source : International Journal of thermal Sciences - vol. 44 - n. 10
  • Date d'édition : 10/2005

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