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Document IIF

Transfert de chaleur en ébullition libre à partir de tubes horizontaux de surfaces de différentes rugosités.

Pool boiling heat transfer from horizontal tubes with different surface roughness.

Auteurs : LUKE A.

Type d'article : Article, Article de la RIF

Résumé

The influence of the roughness of a heating surface on the heat transfer coefficient has been investigated by experiments with propane boiling on single horizontal copper and steel tubes with different surface roughnesses (emery ground, fine or rough sandblasted). The results can be correlated in a preliminar manner by no longer separating the influence of surface roughness from the other parameters in an empirical prediction method. A detailed description of the three surfaces on the steel tube examined is given, with surface profiles, quasi three-dimensional topography presentation, SEM photographs, and with a statistical analysis of a selected roughness parameter. The size distributions of active nuceation sites have been determined using the model assumptions of Schömann of the heat transfer near growing and departing bubbles. The calculated results have been compared to experimental investigations by high speed video techniques. New measurements of the departure diameter and frequency of the bubbles at the same conditions as for the heat transfer measurements show that departure diameter and frequency are influenced by the azimuthal position of the active nucleation sites on the tube, and that the calculated results react sensitively on the input data for departure diameter and frequency.

Documents disponibles

Format PDF

Pages : 561-574

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 : Pool boiling heat transfer from horizontal tubes with different surface roughness.
  • Identifiant de la fiche : 1998-2209
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 20 - n. 8
  • Date d'édition : 12/1997

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