Transient phenomena during the emptying process of a single pipe with water-air interaction

Emptying pipelines can be critical in many water distribution networks because subatmospheric pressure troughs could cause considerable damage to the system due to the expansion of entrapped air. Researchers have given relatively little attention to emptying processes compared to filling processes....

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Bibliographic Details
Published in:Journal of hydraulic research Vol. 57; no. 3; pp. 318 - 326
Main Authors: Fuertes-Miquel, Vicente S., Coronado-Hernández, Oscar E., Iglesias-Rey, Pedro L., Mora-Meliá, Daniel
Format: Journal Article
Language:English
Published: Madrid Taylor & Francis 04.05.2019
Taylor & Francis Ltd
Subjects:
Air
air valve
Air-water
Air-water interface
Atmospheric pressure
Computer applications
Computer simulation
Distribution management
Emptying
entrapped air
Mathematical models
Mud-water interfaces
pipelines emptying
Pipes
Pressure
Pressure oscillations
Stress concentration
Submarine pipelines
transient flow
Upstream
Water distribution
water distribution networks
Water engineering
Water pipelines
ISSN:0022-1686, 1814-2079
Online Access:Get full text
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Summary:Emptying pipelines can be critical in many water distribution networks because subatmospheric pressure troughs could cause considerable damage to the system due to the expansion of entrapped air. Researchers have given relatively little attention to emptying processes compared to filling processes. The intricacy of computations of this phenomenon makes it difficult to predict the behaviour during emptying, and there are only a few reliable models in the literature. In this work, a computational model for simulating the transient phenomena in single pipes is proposed, and was validated using experimental results. The proposed model is based on a rigid column to analyse water movement, the air-water interface, and air pocket equations. Two practical cases were used to validate the model: (1) a single pipe with the upstream end closed, and (2) a single pipe with an air valve installed on the upstream end. The results show how the model accurately predicts the experimental data, including the pressure oscillation patterns and subatmospheric pressure troughs.
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ISSN:0022-1686
1814-2079
DOI:10.1080/00221686.2018.1492465