Assessment of steady and unsteady friction models in the draining processes of hydraulic installations

Óscar E. Coronado-Hernández; Ivan Derpich; Vicente S. Fuertes-Miquel; Jairo R. Coronado-Hernández; Gustavo Gatica

doi:10.3390/w13141888

Assessment of steady and unsteady friction models in the draining processes of hydraulic installations

Óscar E. Coronado-Hernández, Ivan Derpich, Vicente S. Fuertes-Miquel, Jairo R. Coronado-Hernández, Gustavo Gatica

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

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.

Original language	English
Article number	1888
Journal	Water (Switzerland)
Volume	13
Issue number	14
DOIs	https://doi.org/10.3390/w13141888
Publication status	Published - 2 Jul 2021

Keywords

Air pocket
Draining process
Friction factor
Transient flow
Unsteady

ASJC Scopus subject areas

Geography, Planning and Development
Biochemistry
Aquatic Science
Water Science and Technology

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10.3390/w13141888

Cite this

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abstract = "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.",

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AU - Coronado-Hernández, Óscar E.

AU - Derpich, Ivan

AU - Fuertes-Miquel, Vicente S.

AU - Coronado-Hernández, Jairo R.

AU - Gatica, Gustavo

PY - 2021/7/2

Y1 - 2021/7/2

N2 - 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.

AB - 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.

KW - Air pocket

KW - Draining process

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KW - Transient flow

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Assessment of steady and unsteady friction models in the draining processes of hydraulic installations

Abstract

Keywords

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