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CO2 : transfert de chaleur lors de l'ébullition libre sur un tube horizontal.

Pool boiling heat transfer of carbon dioxide on a horizontal tube.

Auteurs : LOEBL S., KRAUS W. E., QUACK H.

Type d'article : Article, Article de la RIF

Résumé

Carbon dioxide is again becoming an important refrigerant. While the thermophysical properties are well known, there is a lack of data on its heat transfer characteristics. In this study, heat transfer coefficients for nucleate boiling of carbon dioxide are determined using a standard apparatus for the investigation of pool boiling based on a set-up from Karlsruhe and built at the authors' institute. Electrically heated horizontal cylinders with an outer diameter of 16 mm and a length of 100 mm are used as heating elements. Measurements with constant heat flux are performed for different wall materials and surface roughness. Heat fluxes of up to 80 000 W/m2 are applied. The influences of wall material and roughness on the heat transfer coefficient are evaluated separately. The obtained coefficients are compared to generally accepted correlations and to experimental results of other authors, who used similar configurations with copper tubes and carbon dioxide. These are the only previous experimental data, which could be found. Results for copper, stainless steel and aluminium as wall materials are presented.

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Format PDF

Pages : 1196-1204

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  • Prix public

    20 €

  • Prix membre*

    Gratuit

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Détails

  • Titre original : Pool boiling heat transfer of carbon dioxide on a horizontal tube.
  • Identifiant de la fiche : 2006-0624
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 28 - n. 8
  • Date d'édition : 12/2005

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