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Ecoulement turbulent dans des canaux : amélioration du transfert de chaleur et chute de pression due à la rugosité superficielle.

Heat-transfer enhancement and pressure loss by surface roughness in turbulent channel flows.

Auteurs : KATOH K., CHOI K. S., AZUMA T.

Type d'article : Article

Résumé

The results confirmed that the efficiency of heat-transfer surfaces is in general less than unity when the molecular Prandtl number of the working fluid is less than the turbulent Prandtl number. When the molecular Prandtl number is greater than the turbulent Prandtl number, it was shown that the efficiency could be greater than unity as long as the surface roughness is transitional. It is suggested that the breakdown of the Reynolds analogy being experimentally observed for the riblet surface seems to be due to the inhomogeneity of the heat flux over the micro-grooves at the initial stage of thermal boundary-layer development.

Détails

  • Titre original : Heat-transfer enhancement and pressure loss by surface roughness in turbulent channel flows.
  • Identifiant de la fiche : 2001-2142
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 43 - n. 21
  • Date d'édition : 11/2000

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