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Amélioration du transfert de chaleur de la condensation de la vapeur dans un condenseur horizontal multitubulaire en ajoutant de l'ammoniac.

The enhancement of steam condensation heat transfer in a horizontal shell and tube condenser by addition of ammonia.

Auteurs : PHILPOTT C., DEANS J.

Type d'article : Article

Résumé

This article reports on the rates of condensation heat transfer for weak ammonia-water mixtures in a horizontal, shell and tube condenser. It was shown that for inlet ammonia concentrations in the range 0.2-0.9 wt.% the average condensation heat transfer for the condenser was enhanced by up to 14%. Furthermore, local enhancement of the condensation heat transfer of up to 34% occurred at local bulk vapour concentrations between 0.2 and 2 wt.% ammonia. This enhancement was caused by the Marangoni effect which produced a disturbed, turbulent banded condensate film and a corresponding drop in the thermal resistance of the condensate film.

Détails

  • Titre original : The enhancement of steam condensation heat transfer in a horizontal shell and tube condenser by addition of ammonia.
  • Identifiant de la fiche : 2005-0622
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 47 - n. 17-18
  • Date d'édition : 08/2004

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