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Article

Concerning Dynamic Effects in Pipe Systems with Two-Phase Flows: Pressure Surges, Cavitation, and Ventilation

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Department of Civil Engineering, Architecture and Georesources, CERIS, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisbon, Portugal
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Department of Hydraulic and Environmental Engineering, Universitat Politècnica de València, 46022 Valencia, Spain
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School of Civil Engineering, Architecture and Urban Design, State University of Campinas, Campinas 13083-889, Brazil
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Facultad de Ingeniería, Universidad Tecnológica de Bolívar, Cartagena 131001, Colombia
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School of Civil Engineering, University of Leeds, Leeds LS2 9JT, UK
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College of Water Conservancy and Hydropower Engineering, Hohai University, 1 Xikang Rd., Nanjing 210098, China
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Department of Civil and Mineral Engineering, University of Toronto, Toronto, ON M5S 1A4, Canada
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Author to whom correspondence should be addressed.
Academic Editor: Chin H Wu
Water 2022, 14(15), 2376; https://doi.org/10.3390/w14152376
Received: 7 July 2022 / Revised: 26 July 2022 / Accepted: 28 July 2022 / Published: 31 July 2022
(This article belongs to the Special Issue Hydraulic Transients in Water Distribution Systems)
The risks associated with unsteady two-phase flows in pressurized pipe systems must be considered both in system design and operation. To this end, this paper summarizes experimental tests and numerical analyses that highlight key aspects of unsteady two-phase flows in water pipelines. The essential dynamics of air–water interactions in unvented lines are first considered, followed by a summary of how system dynamics change when air venting is provided. System behaviour during unsteady two-phase flows is shown to be counter-intuitive, surprising, and complex. The role of air valves as protection devices is considered as is the reasonableness of the usual assumptions regarding air valve behaviour. The paper then numerically clarifies the relevance of cavitation and air valve performance to both the predicted air exchanges through any installed air valves and their role in modifying system behaviour during unsteady flows. View Full-Text
Keywords: pipelines; entrapped air; two-phase flow; air valves; hydraulic transients; cavitation pipelines; entrapped air; two-phase flow; air valves; hydraulic transients; cavitation
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MDPI and ACS Style

Ramos, H.M.; Fuertes-Miquel, V.S.; Tasca, E.; Coronado-Hernández, O.E.; Besharat, M.; Zhou, L.; Karney, B. Concerning Dynamic Effects in Pipe Systems with Two-Phase Flows: Pressure Surges, Cavitation, and Ventilation. Water 2022, 14, 2376. https://doi.org/10.3390/w14152376

AMA Style

Ramos HM, Fuertes-Miquel VS, Tasca E, Coronado-Hernández OE, Besharat M, Zhou L, Karney B. Concerning Dynamic Effects in Pipe Systems with Two-Phase Flows: Pressure Surges, Cavitation, and Ventilation. Water. 2022; 14(15):2376. https://doi.org/10.3390/w14152376

Chicago/Turabian Style

Ramos, Helena M., Vicente S. Fuertes-Miquel, Elias Tasca, Oscar E. Coronado-Hernández, Mohsen Besharat, Ling Zhou, and Bryan Karney. 2022. "Concerning Dynamic Effects in Pipe Systems with Two-Phase Flows: Pressure Surges, Cavitation, and Ventilation" Water 14, no. 15: 2376. https://doi.org/10.3390/w14152376

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