Subatmospheric pressure in a water draining pipeline with an air pocket
Universidad Tecnológica de Bolívar
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An air pocket’s behaviour inside of a pipeline during transient conditions is of great importance due to its effect on the safety of the hydraulic system and the complexity of modeling its behaviour. The emptying process from water pipelines needs more assessment because the generation of troughs of subatmospheric pressure may lead to serious damage. This research studies the air pocket parameters during an emptying process from a water pipeline. A well-equipped experimental facility was used to measure the pressure and the velocity change throughout the water emptying for different air pocket sizes and valve opening times. The phenomenon was simulated using a one-dimensional (1D) developed model based on the rigid formulation with a non-variable friction factor and a constant pipe diameter. The mathematical model shows good ability in predicting the trough of subatmospheric pressure value as the most important parameter which can affect the safety of hydraulic systems. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.
This work was supported by the Fundación CEIBA - Gobernación de Bolívar, Colombia which covered the financial support for the doctoral student, Oscar E. Coronado-Hernández.
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