Transition of turbulent pipe flow / Achanta Ramakrishna Rao in Journal of hydraulic research, Vol. 47 N° 4 (2009)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 47 N° 4 (2009) . - pp. 519-533 Titre : Transition of turbulent pipe flow Titre original : Transition d'écoulement turbulent en conduite Type de document : texte imprimé Auteurs : Achanta Ramakrishna Rao, Auteur ; Bimlesh Kumar, Auteur Article en page(s) : pp. 519-533 Note générale : Hydraulique Résumé en Français Langues : Anglais (eng) Mots-clés : Friction factor Nikuradse experiments Pipe flow Rough turbulent flows Smooth Transition Velocity profile Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : The velocity profile in turbulent pipe flow is usually divided into two regions, a wall or inner region and a core or outer region. For the inner region, the viscosity and wall shear stress are the important parameters governing the velocity distribution whereas for the outer region, the wall reduces the velocity below the maximum velocity independent of viscosity. In the present work, a velocity model is proposed for turbulent flow in the wall region of a pipe covering the entire transition from smooth to rough flows. Coupling this model for the wall region with the power law velocity model for the core region, an equation for the friction factor is obtained. The model constants are evaluated by using Nikuradse’s experiments in the fully smooth and rough turbulent flows. The model shows good agreement with the friction factor and the velocity profiles obtained by Nikuradse for the transition region of turbulent flow. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com [article] Transition of turbulent pipe flow = Transition d'écoulement turbulent en conduite [texte imprimé] / Achanta Ramakrishna Rao, Auteur ; Bimlesh Kumar, Auteur . - pp. 519-533. Hydraulique Résumé en Français Langues : Anglais (eng) in Journal of hydraulic research > Vol. 47 N° 4 (2009) . - pp. 519-533 Mots-clés : Friction factor Nikuradse experiments Pipe flow Rough turbulent flows Smooth Transition Velocity profile Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : The velocity profile in turbulent pipe flow is usually divided into two regions, a wall or inner region and a core or outer region. For the inner region, the viscosity and wall shear stress are the important parameters governing the velocity distribution whereas for the outer region, the wall reduces the velocity below the maximum velocity independent of viscosity. In the present work, a velocity model is proposed for turbulent flow in the wall region of a pipe covering the entire transition from smooth to rough flows. Coupling this model for the wall region with the power law velocity model for the core region, an equation for the friction factor is obtained. The model constants are evaluated by using Nikuradse’s experiments in the fully smooth and rough turbulent flows. The model shows good agreement with the friction factor and the velocity profiles obtained by Nikuradse for the transition region of turbulent flow. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com

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