Journal
WATER
Volume 13, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/w13141888
Keywords
air pocket; draining process; friction factor; transient flow; unsteady
Categories
Funding
- Research Department of the Universidad Andres Bello [DI-12-20/REG]
- University of Santiago of Chile [062117DC]
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This research improves the mathematical model of hydraulic events by considering unsteady friction models. Experimental validation shows that unsteady friction models slightly improve results compared to steady friction models.
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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