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Transfert de chaleur et caractéristiques de frottement des tubes ondulés en spirale utilisés pour la condensation externe d'ammoniac.

Heat transfer and friction characteristics of spirally corrugated tubes for outer ammonia condensation.

Auteurs : FERNÁNDEZ-SEARA J., UHÍA F. J.

Type d'article : Article, Article de la RIF

Résumé

Experimental research was conducted to evaluate the heat transfer and friction characteristics of spirally corrugated tubes for the outer condensation of ammonia. The tested tubes were made of stainless steel with 18/20 mm nominal diameters. Experiments were carried out at saturation temperature of 40°C and wall subcoolings from 1 to 7.5°C. Heat transfer coefficients on both sides of the tubes and friction factors inside the tubes were experimentally determined. The condensation coefficients turned out to be close to those of a smooth tube. The inner heat transfer enhancement factors ranged from 2.11 to 2.53. The friction factors were 4–5 times higher than those of a smooth tube. The overall heat transfer performance of the corrugated tubes was around 1.27 times higher than the performance provided by smooth tubes

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Pages : 2022-2032

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Détails

  • Titre original : Heat transfer and friction characteristics of spirally corrugated tubes for outer ammonia condensation.
  • Identifiant de la fiche : 30005924
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 35 - n. 7
  • Date d'édition : 11/2012

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