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Amélioration du transfert de chaleur laminaire et transitionnel dans des tubes grâce à des inserts en fils torsadés.

Enhancement of laminar and transitional flow heat transfer in tubes by means of wire coil inserts.

Auteurs : GARCÍA A., SOLANO J. P., VICENTE P. G., et al.

Type d'article : Article

Résumé

This work presents an extensive experimental study on three wire coils of different pitch inserted in a smooth tube in laminar and transition regimes. Isothermal pressure drop tests and heat transfer experiments under uniform heat flux conditions have been carried out. The friction factor increases lie between 5 and 40% in the fully laminar region. The transition from laminar flow to turbulent flow is continuous, without the instabilities and the pressure drop fluctuations that a smooth tube presents. At Reynolds numbers below 200, wire coils do not enhance heat transfer with respect to a smooth tube. For Reynolds numbers between 200 and 1000, wire coils remarkably increase heat transfer. At Reynolds numbers above Re about 1000-1300, transition from laminar to turbulent flow takes place. At Reynolds number around 1000, wire inserts increase the heat transfer coefficient up to eight times with respect to the smooth tube. A performance comparison between wire coils and twisted tape inserts has shown that wire inserts perform better than twisted tapes in the low Reynolds number range: Re= 700-2500. [Reprinted with permission from Elsevier. Copyright, 2007].

Détails

  • Titre original : Enhancement of laminar and transitional flow heat transfer in tubes by means of wire coil inserts.
  • Identifiant de la fiche : 2007-1972
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 50 - n. 15-16
  • Date d'édition : 07/2007

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