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Estimation du coefficient de transfert de chaleur sur les ailettes verticales d'échangeurs de chaleur à tubes ailetés pour différentes vitesses d'air et pour divers espacements d'ailettes.

Estimation of heat transfer coefficient on the vertical plate fin of finned-tube heat exchangers for various air speeds and fin spacings.

Auteurs : CHEN H. T., CHOU J. C., WANG H. C.

Type d'article : Article

Résumé

The finite difference method in conjunction with the least-squares scheme and experimental temperature data is proposed to predict the average heat transfer coefficient and fin efficiency on a vertical square fin of one-circular tube plate finned-tube heat exchangers for various air speeds and fin spacings. The distribution of the heat transfer coefficient on the fin can be very non-uniform, thus the whole square fin is divided into several sub-fin regions in order to predict the heat transfer coefficient and fin efficiency values. These two predicted values can be obtained using the present inverse scheme in conjunction with the knowledge of the temperatures recordings at several selected measurement locations. The results show that the heat transfer coefficient on the upstream fin region can be markedly higher than that on the downstream fin region. The heat transfer coefficient value increases with increasing the fin spacing S and air speed V(air), and the fin efficiency value decreases with increasing the S and V(air) values. The heat transfer coefficient and fin efficiency values respectively approach their corresponding asymptotical values obtained from a single fin. The distributions of the fin temperature depart from the ideal isothermal situation and the fin temperature decreases more rapidly away from the circular center with increasing the fin spacing and air speed. [Reprinted with permission from Elsevier. Copyright, 2006].

Détails

  • Titre original : Estimation of heat transfer coefficient on the vertical plate fin of finned-tube heat exchangers for various air speeds and fin spacings.
  • Identifiant de la fiche : 2007-1035
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 50 - n. 1-2
  • Date d'édition : 01/2007

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