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Mesures LDV des paramètres dynamiques des bulles d'ébullition sur deux tubes à surface augmentée immergés dans du R134a saturé.

LDV assisted bubble dynamic parameter measurements from two enhanced tubes boiling in saturated R134a.

Auteurs : HSIEH S. S., LAI W. C., TSAI H. H.

Type d'article : Article

Résumé

This article presents LDV measurements and heat transfer experiments for nucleate pool boiling from two horizontal enhanced tubes with porous copper on copper surfaces immersed in saturated R134a. The influence of tube position (alignment) and tube pitch on bubble dynamics and boiling characteristics were studied. Photographs indicate that the average number of bubbles increases with heat fluxes; this is in agreement with previous studies on single tubes. However, the bubble departure diameters of the upper tube show an opposite trend with an increase compared with previous single-tube studies. LDV measurements show that the present tube arrangement has a significant influence on the local velocity in both magnitude and trend. The heat transfer mechanism and modelling for the upper tube were studied and developed.

Détails

  • Titre original : LDV assisted bubble dynamic parameter measurements from two enhanced tubes boiling in saturated R134a.
  • Identifiant de la fiche : 2004-0591
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 46 - n. 25
  • Date d'édition : 12/2003

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