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Analyse structurale de l'écoulement turbulent dans un canal chauffé, avec réduction des traînées à l'aide d'agents tensioactifs.

Structural analysis of turbulent transport in a heated drag-reducing channel flow with surfactant additives.

Auteurs : LI H., KAWAGUCHI Y., HISHIDA K.

Type d'article : Article

Résumé

Turbulence transport features in a heated drag-reducing surfactant solution (CTAC, 30 wppm) channel flow was investigated by simultaneously measuring velocity and temperature fluctuations in the thermal boundary layer. Structural analysis showed that the drag-reducing additives inhibited the motions associated with ejections of low-momentum fluid away from the wall and sweeps of high-momentum fluid toward the wall (the second and fourth quadrant motion respectively) but had no obvious effect on the outward motion of high-momentum fluid and wall-ward motion of low-momentum fluid (the first and third quadrant motion respectively). The depression of wall-normal turbulent heat flux was due to the decreased contributions of the second and fourth quadrant motions.

Détails

  • Titre original : Structural analysis of turbulent transport in a heated drag-reducing channel flow with surfactant additives.
  • Identifiant de la fiche : 2005-1710
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 48 - n. 5
  • Date d'édition : 02/2005

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