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Amélioration du transfert de chaleur à l'aide de générateurs de vortex au sein d'échangeurs de chaleur compacts aux tubes lisses ailetés.

Heat transfer enhancement by winglet-type vortex generator arrays in compact plain-fin-and-tube heat exchangers.

Auteurs : JOARDAR A., JACOBI A. M.

Type d'article : Article, Article de la RIF

Résumé

The potential of winglet type vortex generator (VG) arrays for air-side heat transfer enhancement is experimentally evaluated by full-scale wind-tunnel testing of a compact plain-fin-and-tube heat exchanger. The effectiveness of a 3VG alternate-tube inline array of vortex generators is compared to a single-row vortex generator design and the baseline configuration. The winglets are placed in a common-flow-up orientation for improved tube wake management. The overall heat transfer and pressure drop performance are assessed under dry-surface conditions over a Reynolds number range based on hydraulic diameter of 220 inferior or equal to Re inferior or equal to 960. It is found that the air-side heat transfer coefficient increases from 16.5 to 44% for the single-row winglet arrangement with an increase in pressure drop of less than 12%. For the three-row vortex generator array, the enhancement in heat transfer coefficient increases with Reynolds number from 29.9 to 68.8% with a pressure drop penalty from 26% at Re= 960 to 87.5% at Re= 220. The results indicate that vortex generator arrays can significantly enhance the performance of fin-tube heat exchangers with flow depths and fin densities typical to those used in air-cooling and refrigeration applications.

Documents disponibles

Format PDF

Pages : 87-97

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Heat transfer enhancement by winglet-type vortex generator arrays in compact plain-fin-and-tube heat exchangers.
  • Identifiant de la fiche : 2008-0555
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 31 - n. 1
  • Date d'édition : 01/2008

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