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Transfert de chaleur lors de l'ébullition en convection forcée sous-refroidie de R134a et caractéristiques des bulles dans un tube horizontal annulaire.

Subcooled flow boiling heat transfer of R134a and bubble characteristics in a horizontal annular duct.

Auteurs : YIN C. P., YAN Y. Y., LIN T. S., et al.

Type d'article : Article

Résumé

The effects of the imposed wall heat flux, mass flux, liquid subcooling and saturation temperature of R134a were examined in detail. Significant hysteresis was noted in the boiling curves during the onset of nucleate boiling (ONB). The temperature undershoot at ONB is rather large for most cases. The boiling heat transfer was slightly higher for a lower saturation temperature and was little affected by the mass flux. However, for a higher subcooling of the refrigerant better heat transfer results. Flow visualization allowed to investigate bubble generation along with heat flux and subcooling variations. Empirical correlations for the heat transfer coefficient and bubble departure diameter in the subcooled flow boiling of R134a were proposed.

Détails

  • Titre original : Subcooled flow boiling heat transfer of R134a and bubble characteristics in a horizontal annular duct.
  • Identifiant de la fiche : 2001-0067
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 43 - n. 11
  • Date d'édition : 06/2000

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