On the gradient diffusion hypothesis and passive scalar transport in turbulent flows / Daniel P. Combest in Industrial & engineering chemistry research, Vol. 50 N° 15 (Août 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 8817–8823 Titre : On the gradient diffusion hypothesis and passive scalar transport in turbulent flows Type de document : texte imprimé Auteurs : Daniel P. Combest, Auteur ; Palghat A. Ramachandran, Auteur ; Milorad P. Dudukovic, Auteur Année de publication : 2011 Article en page(s) : pp. 8817–8823 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Turbulent flow Transport process Diffusion Résumé : A discussion of modeling passive scalar transport in turbulent flows is given. Several methods employed to dose the scalar-flux term ⟨u'φ'⟩ that arises during Reynolds averaging are provided. Alternatives and improvements to the gradient diffusion hypotheses are addressed, most notably, the need for an alternative to the global constant turbulent Schmidt and Prandtl numbers. The reader is given a brief history covering methods used to predict turbulent Schmidt and Prandtl numbers, along with recommendations for future research, based partially on studies by Professor Stuart Churchill. More detailed formulations of turbulent Schmidt or Prandtl numbers will enable better approximations of the influence of turbulence in models of passive scalar flows using the gradient diffusion hypothesis. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395827 [article] On the gradient diffusion hypothesis and passive scalar transport in turbulent flows [texte imprimé] / Daniel P. Combest, Auteur ; Palghat A. Ramachandran, Auteur ; Milorad P. Dudukovic, Auteur . - 2011 . - pp. 8817–8823. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 8817–8823 Mots-clés : Turbulent flow Transport process Diffusion Résumé : A discussion of modeling passive scalar transport in turbulent flows is given. Several methods employed to dose the scalar-flux term ⟨u'φ'⟩ that arises during Reynolds averaging are provided. Alternatives and improvements to the gradient diffusion hypotheses are addressed, most notably, the need for an alternative to the global constant turbulent Schmidt and Prandtl numbers. The reader is given a brief history covering methods used to predict turbulent Schmidt and Prandtl numbers, along with recommendations for future research, based partially on studies by Professor Stuart Churchill. More detailed formulations of turbulent Schmidt or Prandtl numbers will enable better approximations of the influence of turbulence in models of passive scalar flows using the gradient diffusion hypothesis. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395827

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