A simplified method for calculating heat transfer coefficients and friction factors in laminar pipe flow of non-Newtonian fluids / D. A. Cruz in Journal of heat transfer, Vol 134 N° 9 (Septembre 2012)  

Public ISBD [article]  inJournal of heat transfer > Vol 134 N° 9 (Septembre 2012) . - 06 p. Titre : A simplified method for calculating heat transfer coefficients and friction factors in laminar pipe flow of non-Newtonian fluids Type de document : texte imprimé Auteurs : D. A. Cruz, Auteur ; P. M. Coelho, Auteur ; M. A. Alves, Auteur Année de publication : 2012 Article en page(s) : 06 p. Note générale : heat transfer Langues : Anglais (eng) Mots-clés : approximate method  Nusselt number  heat transfer  fully developed pipe flow  laminar generalized Newtonian fluid  friction factor Index. décimale : 536 Chaleur. Thermodynamique Résumé : In this work, we propose an approximate methodology to estimate the Nusselt number and friction factor in fully developed non-Newtonian laminar flow in circular pipes for a constant wall heat flux. The methodology was tested using several constitutive equations, including generalized Newtonian fluids and viscoelastic models such as the simplified Phan-Thien–Tanner (sPTT), Herschel–Bulkley, Bingham, Casson, and Carreau–Yasuda constitutive equations. The error of the approximate methodology was found to be smaller than 3.2%, except for the fluids with yield stress for which the maximum error increased to about 8% for the cases analyzed, which cover a wide range of shear viscosity curves. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000009 [...] [article] A simplified method for calculating heat transfer coefficients and friction factors in laminar pipe flow of non-Newtonian fluids [texte imprimé] / D. A. Cruz, Auteur ; P. M. Coelho, Auteur ; M. A. Alves, Auteur . - 2012 . - 06 p. heat transfer Langues : Anglais (eng) in Journal of heat transfer > Vol 134 N° 9 (Septembre 2012) . - 06 p. Mots-clés : approximate method  Nusselt number  heat transfer  fully developed pipe flow  laminar generalized Newtonian fluid  friction factor Index. décimale : 536 Chaleur. Thermodynamique Résumé : In this work, we propose an approximate methodology to estimate the Nusselt number and friction factor in fully developed non-Newtonian laminar flow in circular pipes for a constant wall heat flux. The methodology was tested using several constitutive equations, including generalized Newtonian fluids and viscoelastic models such as the simplified Phan-Thien–Tanner (sPTT), Herschel–Bulkley, Bingham, Casson, and Carreau–Yasuda constitutive equations. The error of the approximate methodology was found to be smaller than 3.2%, except for the fluids with yield stress for which the maximum error increased to about 8% for the cases analyzed, which cover a wide range of shear viscosity curves. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000009 [...]

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