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Etude expérimentale des effets de l'angle spiral sur l'augmentation du transfert de chaleur par évaporation dans des tubes à micro-ailettes internes.

Experimental study of the effects of the spiral angle on evaporative heat transfer enhancement in microfin tubes.

Auteurs : OH S. Y., BERGLES A. E.

Résumé

The in-tube evaporative heat transfer of the hydrofluorocarbon R134a was examined for a smooth tube and five microfin tubes. The heat transfer coefficient in the smooth tube was compared with four correlations. The Yoshida correlation was found to be the best in annular flow, and the Kandlikar correlation with FK= 2.33 was the best in stratified flow, but the latter needs clarification for its applicability to the low quality range because of the strong nucleate boiling effect caused by the large value of FK. The effect of the spiral angle of microfin tubes was investigated to determine the optimal spiral angle.

Détails

  • Titre original : Experimental study of the effects of the spiral angle on evaporative heat transfer enhancement in microfin tubes.
  • Identifiant de la fiche : 1999-3442
  • Langues : Anglais
  • Source : ASHRAE Transactions. 1998 annual Meeting, Toronto, Ontario + CD-ROM.
  • Date d'édition : 1998
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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