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Ébullition libre sur un faisceau de tubes en mousse métallique : caractéristiques du transfert de chaleur et visualisation de l’écoulement.

Pool boiling on metal-foam enhanced tube bundle: Heat transfer characteristics and flow visualization.

Numéro : 1098

Auteurs : YANG C.-M., MUNEESHWARAN M., WANG P., NAWAZ K.

Résumé

A flooded evaporator configuration is common in large central air conditioning or process cooling systems. It is basically a shell and tube heat exchanger, in which a secondary fluid (brine or water) circulates inside the tube bundle and is cooled by the vaporization of the refrigerant on the outside surface of the tubes. The enhanced pool boiling process enables the compact design of flooded evaporators, which substantially reduces the refrigerant charge. High-porosity metal foam, with a large surface-area-to-volume ratio, could provide an extended heat transfer area and a high-density of nucleation sites. This study experimentally investigated the pool boiling heat transfer and flow characteristics on metal-foam enhanced tube bundles. The enhanced bundle consists of four aluminum tubes with aluminum foam brazed around the outer surface, which are horizontally mounted in a staggered arrangement. The results showed that the metal-foam enhanced tube bundles improved the heat transfer coefficient by 100-160% with a lower wall temperature difference of 1-10°C, compared to the baseline. In addition, the tube pitch played a significant role in determining the pool boiling behavior of the tube bundles.

Documents disponibles

Format PDF

Pages : 11 p.

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

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

Détails

  • Titre original : Pool boiling on metal-foam enhanced tube bundle: Heat transfer characteristics and flow visualization.
  • Identifiant de la fiche : 30033547
  • Langues : Anglais
  • Sujet : Généralités
  • Source : 14th IEA Heat Pump Conference 2023, Chicago, Illinois.
  • Date d'édition : 05/2023

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