Analytical and Numerical Solution for a Rigid Liquid-Column Moving in a Pipe With Fluctuating Reservoir-Head and Venting Entrapped-Gas

@inproceedings{Tijsseling2016AnalyticalAN,
  title={Analytical and Numerical Solution for a Rigid Liquid-Column Moving in a Pipe With Fluctuating Reservoir-Head and Venting Entrapped-Gas},
  author={As Arris Tijsseling and Qingzhi Hou and Zafer Bozkuş},
  year={2016}
}
The motion of liquid filling a pipeline is impeded when the gas ahead of it cannot escape freely. Trapped gas will lead to a significant pressure build-up in front of the liquid column, which slows down the column and eventually bounces it back. This paper is an extension of previous work by the authors in the sense that the trapped gas can escape through a vent. Another addition is that the driving pressure is not kept constant but fluctuating. The obtained analytical and numerical solutions… 
1 Citations

Figures and Tables from this paper

Rapid Liquid Filling of a Pipe With Venting Entrapped Gas: Analytical and Numerical Solutions
The motion of liquid filling a pipeline is impeded when the gas ahead of it cannot escape. Entrapped gas will lead to a significant pressure build-up in front of the liquid column, which slows down

References

SHOWING 1-10 OF 23 REFERENCES
Influence of Liquid Length Variation in Hydraulic Transients
When a problem of hydraulic transients with entrapped air in pipelines and/or with water‐column separation is tackled, the variation of the length of the liquid column is not usually taken into
Lagrangian modelling of fluid transients in pipelines with entrapped air
Pressure surges with large entrapped air bubbles at a dead pipe end arc difficult to simulate within an Eulerian framework, when both water/air interface movement and liquid compressibility are taken
Conceptual analogy for modelling entrapped air action in hydraulic systems
ABSTRACT Hydraulic systems are dynamically susceptible in the presence of entrapped air pockets, leading to amplified transient reactions. In order to model the dynamic action of an entrapped air
Dynamic water behaviour due to one trapped air pocket in a laboratory pipeline apparatus
Trapped air pockets may cause severe operational problems in hydropower and water supply systems. A locally isolated air pocket creates distinct amplitude, shape and timing of pressure pulses. This
Experimental and Numerical Investigation on the Motion of Discrete Air Pockets in Pressurized Water Flows
AbstractEntrapped air pockets are linked to various operational issues in closed pipe flows. Tracking of entrapped air pockets is a relevant task in numerical simulation of hydraulic systems
Numerical and Experimental Analysis of the Pressurized Wave Front in a Circular Pipe
AbstractThis paper focuses on pressurized wavefront behavior and an analysis of trapped air pockets. Flow behavior, trapped air-pocket pressure, and different pressurized wavefront shapes in addition
Improved one-dimensional models for rapid emptying and filling of pipelines
Improved one-dimensional (1D) models ? compared to previous work by the authors ? are proposed which are able to predict the velocity, length and position of the liquid column in the rapid emptying
Pipeline start-up with entrapped air
A mathematical model for the assessment of the pressure head maxima that air pockets within a pipeline can originate on start-up is presented. This model is based on a general model addressing the ...
Numerical Study on the Commissioning Charge-Up Process of Horizontal Pipeline with Entrapped Air Pockets
Accurately predicting hydraulic characteristics in the charge-up process of horizontal pipeline with entrapped air pocket is of great significance for the process design and field operation of the
Analytical Expressions for Liquid-Column Velocities in Pipelines With Entrapped Gas
High pressures and high temperatures may arise in pipelines when a liquid column is suddenly accelerated into a gas pocket trapped at a closed end. A mass oscillation occurs that is described by
...
...