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Document IIF

Etude expérimentale de l'effet de la direction de l'écoulement sur le transfert de chaleur du dioxyde de carbone surcritique s'écoulant dans un tube vertical refroidi.

Experimental investigation of the effect of flow direction on heat transfer of supercritical carbon dioxide flowing in a cooled vertical tube.

Auteurs : BRUCH A., COLASSON S., BONTEMPS A.

Résumé

The heat transfer coefficient of turbulent flows of supercritical carbon dioxide was experimentally investigated for vertical flows. The test section consists of two subsections connected in series and forming a U-tube. Each subsection is a 0.75 m-long vertical tube-in-tube counter-flow heat exchanger, with CO2 flowing in the inner copper tube of 6-mm diameter and cooling water flowing in the annulus. Experimental results indicate that strong differences on heat transfer coefficients appear with flow direction, indicating an influence of buoyancy forces on heat transfer process. Results are presented on a dimensionless form commonly used in the studies of mixed convection in heating but not used in studies of cooling of supercritical carbon dioxide. Based on the experimental data collected in this work, correlations have been developed for upward and downward turbulent flows, respectively. The results complete the missing data of the literature on turbulent vertical mixed convection in cooling conditions.

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Format PDF

Pages : ICR07-B1-560

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    20 €

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Détails

  • Titre original : Experimental investigation of the effect of flow direction on heat transfer of supercritical carbon dioxide flowing in a cooled vertical tube.
  • Identifiant de la fiche : 2007-2510
  • Langues : Anglais
  • Source : ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Date d'édition : 21/08/2007

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