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Visualisation simultanée des zones sèches et des bulles lors de l'ébullition libre de R113 sur un appareil de chauffage horizontal.

Simultaneous visualization of dry spots and bubbles for pool boiling of R113 on a horizontal heater.

Auteurs : CHUNG H. J., NO H. C.

Type d'article : Article

Résumé

A new experimental attempt was made to simultaneously observe the dynamic behaviours of bubbles and dry spots in the vicinity of a boiling surface. The two-dimensional bubble structures were obtained separately. Visualization showed that the formation of bubbles and dry spots occurs simultaneously. At critical heat flux (CHF), the surface rewetting is repeated by the local nucleate boiling around the large vapour film. Just after CHF, nucleate boiling in the locally wetted region is extinguished, resulting in the dryout of the whole heater surface. The authors conclude that CHF is initiated from the locally limited nucleate boiling activity rather than any hydrodynamic instability.

Détails

  • Titre original : Simultaneous visualization of dry spots and bubbles for pool boiling of R113 on a horizontal heater.
  • Identifiant de la fiche : 2003-2746
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 46 - n. 12
  • Date d'édition : 06/2003

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