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Transfert de chaleur lors de la convection naturelle du CO2 à une pression supercritique.

Natural convective cooling heat transfer of CO2 at the supercritical pressure.

Auteurs : ISHIHARA I., MORI H., MATSUMOTO R.

Résumé

This paper deals with the natural convective cooling heat transfer along the outside of the vertical cooled cylinder (heat transfer surface), which is obtained experimentally near the critical point at the supercritical pressure. Experiments were performed with changing in parameters: the CO2 fluid pressure= 7.4, 7.5 and 7.6 MPa, temperature of the heat transfer surface being the pseudocritical temperature and higher, temperature difference between transfer surface and the CO2 fluid temperature; temperature difference= 0-30 K. The state and flow of the CO2 fluid near the heat transfer surface was observed and the temperature distribution of the CO2 fluid adjacent to the surface was measured. The local heat flux and heat transfer coefficient were obtained and discussed in connection with above measurements and transport properties of the CO2. The "condensation-like" phenomenon was observed and the heat transfer characteristics have a close similarity to the condensation heat transfer obtained in the subcritical region.

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Pages : 2006-2

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Détails

  • Titre original : Natural convective cooling heat transfer of CO2 at the supercritical pressure.
  • Identifiant de la fiche : 2008-0078
  • Langues : Anglais
  • Source : 7th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2006). Proceedings
  • Date d'édition : 29/05/2006

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