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Etude numérique du coefficient de transfert de chaleur et de l'efficacité des ailettes des échangeurs de chaleur à tubes et ailettes ondulées.

Numerical study of local heat transfer coefficient and fin efficiency of wavy fin-and-tube heat exchangers.

Auteurs : TAO Y. B., HE Y. L., HUANG J., et al.

Type d'article : Article

Résumé

Three-dimensional numerical simulations were performed for laminar flow of wavy fin-and-tube heat exchangers by using body-fitted coordinates method with fin efficiency effect accounted. The prediction results of average Nusselt number, friction factor and fin efficiency were compared with the related experimental correlations. For Reynolds numbers based on the tube outside diameter ranging from 500 to 4000, the mean deviation is 3.3% for Nusselt number, 1.9% for friction factor and 3.6% for fin efficiency. The distributions of local Nusselt number and fin efficiency on fin surface were studied at wavy angle equal to 0° (plain plate fin), 10 and 20° respectively. The local Nusselt number decreases along the air flow direction, but fin efficiency increases in general. The wavy angle can greatly affect the distributions of local Nusselt number and fin efficiency, and make the distributions present fluctuation along the flow direction. The result also shows that the fin efficiency at the inlet region of wavy fin is larger than that of plain plate fin at the same region. With the increase of Reynolds number, the effects of wavy angle on the distributions of local Nusselt number and fin efficiency are more and more significant. [Reprinted with permission from Elsevier. Copyright, 2006].

Détails

  • Titre original : Numerical study of local heat transfer coefficient and fin efficiency of wavy fin-and-tube heat exchangers.
  • Identifiant de la fiche : 2007-1970
  • Langues : Anglais
  • Source : International Journal of thermal Sciences - vol. 46 - n. 8
  • Date d'édition : 08/2007

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