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Transfert de chaleur lors du refroidissement à l'intérieur de tubes dans un système au dioxyde de carbone transcritique. 2. Comparaison entre le calcul numérique et divers modèles d'écoulements turbulents.

In-tube cooling heat transfer of supercritical carbon dioxide. 2. Comparison of numerical calculation with different turbulence models.

Auteurs : DANG C., HIHARA E.

Type d'article : Article, Article de la RIF

Résumé

A major difficulty in the numerical calculation of the heat transfer of supercritical carbon dioxide is the proper selection of the turbulence model. Because the thermophysical properties significantly depend on temperature and pressure, conventional turbulence models proposed for constant-property conditions might not be valid for supercritical pressure conditions, and therefore need to be analysed carefully. Here, four turbulence models were applied to both heating and cooling conditions of supercritical carbon dioxide, and the simulation results of heat transfer coefficient were then compared with experimental data. The JL model (low Reynolds number k-epsilon model by Jones and Launder) showed the best agreement with the experimental data. The three other models (a mixing length model by Bellmore and Reid, and two other low Reynolds number k-epsilon models, respectively, by Launder and Sharma and by Myong and Kasagi) should be re-examined because they use a dimensionless distance from the wall gamma. The turbulent Prandtl number did not significantly affect the calculation results of heat transfer coefficient. (See also this Bulletin, reference 2005-0110.)

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Pages : 748-760

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Détails

  • Titre original : In-tube cooling heat transfer of supercritical carbon dioxide. 2. Comparison of numerical calculation with different turbulence models.
  • Identifiant de la fiche : 2005-0107
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 7
  • Date d'édition : 11/2004

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