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Can pipes be actually really that smooth? / Dejan Brkić in International journal of refrigeration, Vol. 35 N° 1 (Janvier 2012) 

Public ISBD [article]  in International journal of refrigeration > Vol. 35 N° 1 (Janvier 2012) . - pp. 209–215 Titre : Can pipes be actually really that smooth? Titre original : Les tubes peuvent-ils être aussi lisses ? Type de document : texte imprimé Auteurs : Dejan Brkić, Auteur Année de publication : 2012 Article en page(s) : pp. 209–215 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Accuracy  Comparison  Flow  rate  Friction  Hydraulics  Piping Résumé : In some recent papers a few approximations to the implicit Nikuradse–Prandtl–Karman equation were shown. The Nikuradse–Prandtl–Karman equation for calculation of the hydraulic friction factor is valid for the hydraulically smooth regime of turbulence. Accuracy of these approximations for the friction factor in so called smooth pipes is checked and related problems from the hydraulics are analyzed in the spotlight of the recently developed equations. It can be concluded that pipes can be treated as smooth below certain value of the Reynolds number but after that even new polished pipes with a minor roughness follow the transitional and subsequently the rough law of flow at a higher values of the Reynolds number. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711002283 [article] Can pipes be actually really that smooth? = Les tubes peuvent-ils être aussi lisses ? [texte imprimé] / Dejan Brkić, Auteur . - 2012 . - pp. 209–215. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 35 N° 1 (Janvier 2012) . - pp. 209–215 Mots-clés : Accuracy  Comparison  Flow  rate  Friction  Hydraulics  Piping Résumé : In some recent papers a few approximations to the implicit Nikuradse–Prandtl–Karman equation were shown. The Nikuradse–Prandtl–Karman equation for calculation of the hydraulic friction factor is valid for the hydraulically smooth regime of turbulence. Accuracy of these approximations for the friction factor in so called smooth pipes is checked and related problems from the hydraulics are analyzed in the spotlight of the recently developed equations. It can be concluded that pipes can be treated as smooth below certain value of the Reynolds number but after that even new polished pipes with a minor roughness follow the transitional and subsequently the rough law of flow at a higher values of the Reynolds number. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711002283