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Prévision des facteurs de friction et des coefficients de transfert de chaleur lors d'un écoulement turbulent à l'intérieur de tubes ondulés à inserts sous forme de rubans torsadés.

Prediction of friction factors and heat transfer coefficients for turbulent flow in corrugated tubes combined with twisted tape inserts: heat transfer coefficients.

Auteurs : ZIMPAROV V.

Type d'article : Article

Résumé

A simple mathematical model following the suggestion of Smithberg and Landis has been created to predict the heat transfer coefficients for the case of a turbulent flow in a spirally corrugated tube combined with a twisted tape insert. The heat transfer can be predicted from the combined effects of the axial and the tangential boundary layer flows coupled with an additional "vortex mixing" effect near the wall through the solution of the corresponding momentun and energy transfer equations. The "wall roughness" has an effect simultaneously on the axial velocity, secondary fluid motion and resulting swirl mixing. The calculated heat transfer coefficients have been compared to 544 experimental points obtained from 57 tubes tested. Results show that 438 points (80.5%) have a relative difference of less than ±15% and 106 points (19.5%) have a relative difference between ±(15-20)%.

Détails

  • Titre original : Prediction of friction factors and heat transfer coefficients for turbulent flow in corrugated tubes combined with twisted tape inserts: heat transfer coefficients.
  • Identifiant de la fiche : 2004-1644
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 47 - n. 2
  • Date d'édition : 01/2004

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