Improved Air Valve Selection through Better Device Characterization and Modeling

Tasca, Elias Sebastião Amaral; Karney, Bryan W.

doi:10.1061/jhend8.hyeng-13420

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…Circular air exchange orifices are assumed. More information about the isentropic air mass flow model can be found in Tasca and Karney (2023) [9]. The air pocket admitted by the air valve is assumed localised, and its evolution is modelled adiabatically, i.e., the evolution of the air pocket follows the polytropic transformation equation with a polytropic exponent of 1.4.…”

Section: Modelling Approach and Limitationsmentioning

confidence: 99%

“…It is to this puzzle that this paper is primarily addressed. The task of evaluating consequences raises many complexities: these include the challenge of predicting the air exchange through an air valve [7], the interaction between air and water within the pipe system [8], the often contradictory sizing criteria for different hydraulic events [9], and the non-linear impact of the air valve on transient behaviour [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Exploring the Sensitivity of the Transient Response following Power Failure to Air Valve and Pipeline Characteristics

Tasca,

Besharat,

Ramos

et al. 2023

Water

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Air valves are protective devices often used in pressurised water pipelines, ideally admitting air to limit sub-atmospheric pressures and controlling the release of entrapped air. This work summarises a comprehensive sensitivity analysis of the transient behaviour in a rising water pipeline with an air valve following a pump trip. The paper examines the water hammer stages associated with a pump trip, namely, the initial depressurisation, followed by air admission, then air expulsion, and finally the creation of a secondary pressure wave. For each air valve location and specific set of design conditions, the relationship between the transient magnitude and air valve outflow capacity is found to be non-linear, but to roughly follow the shape of a logistic curve having a lower left plateau for attenuated (type 1) behaviour and transitioning through type 2 behaviour to a higher right plateau for water-hammer-dominated (type 3) behaviour. Through an extensive set of simulations covering a wide range of conditions, the study identifies the size of the critical outflow orifices associated with both type 1 and type 3 responses and assesses the influence of the location of the air valve on the transient magnitude and on the timing of air pocket collapse. Furthermore, the paper highlights that a non-slam air valve is capable of effectively mitigating transient magnitudes provided that its design parameters are judiciously chosen and account for both the system’s attributes and the characteristics of the transient event.

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Section: Modelling Approach and Limitationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exploring the Sensitivity of the Transient Response following Power Failure to Air Valve and Pipeline Characteristics

Tasca,

Besharat,

Ramos

et al. 2023

Water

Self Cite

View full text Add to dashboard Cite

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Real-Time Analysis and Digital Twin Modeling for CFD-Based Air Valve Control During Filling Procedures

Paternina-Verona,

Coronado-Hernández,

Pérez-Sánchez

et al. 2024

Water

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Air exchange in pressurized water pipelines is an essential but complex aspect of pipeline modeling and operation. Implementing effective air management strategies can yield numerous benefits, enhancing the system’s energy efficiency, reliability, and safety. This paper comprehensively evaluates an irregular profile pipeline filling procedure involving air-release through an air valve. The analysis includes real-time data tests and numerical simulations using Computational Fluid Dynamics (CFD). A Digital Twin model was proposed and applied to filling maneuvers in water installations. In particular, this research considers an often-overlooked aspect, such as filling a pipe with an irregular profile rather than a simple straight pipe. CFD simulations have proven to capture the main features of the transient event, which are suitable for tracking the air-water interface, the unsteady water flow, and the evolution of the trapped air pocket. Thus, they provide thorough and reliable information for real-time operational processes in the industry, focusing on the filling pressure and geometry of the air-valve hydraulic system. Additionally, this study provides details regarding the application of an efficient Digital Twin CFD approach, demonstrating its feasibility in optimizing the filling procedure in pipes with irregular profiles.

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Improved Air Valve Selection through Better Device Characterization and Modeling

Cited by 2 publications

References 22 publications

Exploring the Sensitivity of the Transient Response following Power Failure to Air Valve and Pipeline Characteristics

Exploring the Sensitivity of the Transient Response following Power Failure to Air Valve and Pipeline Characteristics

Real-Time Analysis and Digital Twin Modeling for CFD-Based Air Valve Control During Filling Procedures

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