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Quadratic‐Equation Inaccuracy for Water Hammer
Publisher: American Society of Civil Engineers
Abstract: The standard solution of a quadratic equation is applied for modeling several boundary conditions (such as orifice, valve, and pump) in the water-hammer analysis of pipelines by the method of characteristics. Numerical ...
Pipeline Column Separation Flow Regimes
Publisher: American Society of Civil Engineers
Abstract: A generalized set of pipeline column separation equations is presented describing all conventional types of low-pressure regions. These include water hammer zones, distributed vaporous cavitation, vapor cavities, and shocks ...
Numerical Comparison of Pipe‐Column‐Separation Models
Publisher: American Society of Civil Engineers
Abstract: Results comparing six column‐separation numerical models for simulating localized vapor cavities and distributed vaporous cavitation in pipelines are presented. The discrete vapor‐cavity model (DVCM) is shown to be quite ...
Numerical Error in Weighting Function-Based Unsteady Friction Models for Pipe Transients
Publisher: American Society of Civil Engineers
Abstract: The accurate simulation of pressure transients in pipelines and pipe networks is becoming increasingly important in water engineering. Applications such as inverse transient analysis for condition assessment, leak detection, ...
Systematic Evaluation of One-Dimensional Unsteady Friction Models in Simple Pipelines
Publisher: American Society of Civil Engineers
Abstract: In this paper, basic unsteady flow types and transient event types are categorized, and then unsteady friction models are tested for each type of transient event. One important feature of any unsteady friction model is its ...
Emptying of Large-Scale Pipeline by Pressurized Air
Publisher: American Society of Civil Engineers
Abstract: Emptying of an initially water-filled horizontal PVC pipeline driven by different upstream compressed air pressures and with different outflow restriction conditions, with motion of an air-water front through the pressurized ...
Experimental Investigation on Rapid Filling of a Large-Scale Pipeline
Publisher: American Society of Civil Engineers
Abstract: This study presents the results from detailed experiments of the two-phase pressurized flow behavior during the rapid filling of a large-scale pipeline. The physical scale of this experiment is close to the practical ...
Expulsion of Entrapped Air in a Rapidly Filling Horizontal Pipe
Publisher: ASCE
Abstract: Air expulsion from an end-of-pipe orifice in a rapidly filling horizontal pipe is investigated experimentally and analytically in order to more completely characterize the system’s transient response. In particular, images ...