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Analyse du transfert de chaleur et de l'écoulement des fluides dans des échangeurs de chaleur à plaques à ailettes et à tubes avec une paire de générateurs de vortex en forme de bloc.

Heat transfer and fluid flow analysis in plate-fin and tube heat exchangers with a pair of block-shaped vortex generators.

Auteurs : LEU J. S., WU Y. H., JANG J. Y.

Type d'article : Article

Résumé

Numerical and experimental analyses were carried out to study the heat transfer and flow in the plate-fin and tube heat exchangers with inclined block-shaped vortex generators mounted behind the tubes. The effects of different span alpha angles were investigated in detail for Reynolds numbers ranging from 400 to 3000. Numerical simulation was performed by a 3D turbulence analysis of the heat transfer and fluid flow. Experiments were carried out by an infrared thermovision and a water tunnel system, respectively, to visualize the temperature distribution and local flow structure. The results indicated that the proposed heat transfer enhancement technique is able to generate longitudinal vortices and to improve the heat transfer performance in the wake regions. The case of alpha = 45° provides the best heat transfer augmentation. A reduction in fin area of 25% may be obtained if vortex generator embedded fins are used instead of plain fins at ReDh = 500.

Détails

  • Titre original : Heat transfer and fluid flow analysis in plate-fin and tube heat exchangers with a pair of block-shaped vortex generators.
  • Identifiant de la fiche : 2005-0602
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 47 - n. 19-20
  • Date d'édition : 09/2004

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