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Article

Assessment of Steady and Unsteady Friction Models in the Draining Processes of Hydraulic Installations

1
Facultad de Ingeniería, Universidad Tecnológica de Bolívar, Cartagena 131001, Colombia
2
Departamento de Ingeniería Industrial, Universidad Santiago de Chile, Santiago de Chile 9170020, Chile
3
Departamento de Ingeniería Hidráulica y Medio Ambiente, Universitat Politècnica de València, 46022 Valencia, Spain
4
Departamento de Gestión Industrial, Agroindustrial y Operaciones, Universidad de la Costa, Barranquilla 080001, Colombia
5
Faculty of Engineering, Universidad Andres Bello, Santiago de Chile 7500971, Chile
*
Author to whom correspondence should be addressed.
Academic Editor: António Pinheiro
Water 2021, 13(14), 1888; https://doi.org/10.3390/w13141888
Received: 21 May 2021 / Revised: 30 June 2021 / Accepted: 2 July 2021 / Published: 8 July 2021
(This article belongs to the Special Issue Hydraulic Transients in Water Distribution Systems)
The study of draining processes without admitting air has been conducted using only steady friction formulations in the implementation of governing equations. However, this hydraulic event involves transitions from laminar to turbulent flow, and vice versa, because of the changes in water velocity. In this sense, this research improves the current mathematical model considering unsteady friction models. An experimental facility composed by a 4.36 m long methacrylate pipe was configured, and measurements of air pocket pressure oscillations were recorded. The mathematical model was performed using steady and unsteady friction models. Comparisons between measured and computed air pocket pressure patterns indicated that unsteady friction models slightly improve the results compared to steady friction models. View Full-Text
Keywords: air pocket; draining process; friction factor; transient flow; unsteady air pocket; draining process; friction factor; transient flow; unsteady
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MDPI and ACS Style

Coronado-Hernández, Ó.E.; Derpich, I.; Fuertes-Miquel, V.S.; Coronado-Hernández, J.R.; Gatica, G. Assessment of Steady and Unsteady Friction Models in the Draining Processes of Hydraulic Installations. Water 2021, 13, 1888. https://doi.org/10.3390/w13141888

AMA Style

Coronado-Hernández ÓE, Derpich I, Fuertes-Miquel VS, Coronado-Hernández JR, Gatica G. Assessment of Steady and Unsteady Friction Models in the Draining Processes of Hydraulic Installations. Water. 2021; 13(14):1888. https://doi.org/10.3390/w13141888

Chicago/Turabian Style

Coronado-Hernández, Óscar E., Ivan Derpich, Vicente S. Fuertes-Miquel, Jairo R. Coronado-Hernández, and Gustavo Gatica. 2021. "Assessment of Steady and Unsteady Friction Models in the Draining Processes of Hydraulic Installations" Water 13, no. 14: 1888. https://doi.org/10.3390/w13141888

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