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Amélioration du transfert de chaleur dans les échangeurs de chaleur à écoulement croisé en utilisant des tubes ovales et de multiples ailettes delta.

Heat transfer enhancement in cross-flow heat exchangers using oval tubes and multiple delta winglets.

Auteurs : TIWARI S., MAURYA D., BISWAS G., et al.

Type d'article : Article

Résumé

A three-dimensional study of laminar flow and heat transfer in a channel with built-in oval tube and delta winglets was carried out through the solution of the complete Navier-Stokes and energy equations using a body-fitted grid and a finite-volume method. The geometrical configuration represents an element of a gas-liquid fin-tube cross-flow heat exchanger. The size of such heat exchangers can be reduced through enhancement of transport coefficients on the air (gas) side, which are usually small compared with the liquid side. In a suggested strategy, oval instead of circular tubes were used, and delta-winglet type vortex generators in various configurations were mounted on the fin surface. An evaluation of the strategy was attempted. The structures of the velocity field and the heat transfer characteristics are presented. The results indicate that vortex generators in conjunction with the oval tube show definite promise for the improvement of fin-tube heat exchangers.

Détails

  • Titre original : Heat transfer enhancement in cross-flow heat exchangers using oval tubes and multiple delta winglets.
  • Identifiant de la fiche : 2004-1645
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 46 - n. 15
  • Date d'édition : 07/2003

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