Journal ArticleDOI
Impulse Response Method for Frequency-Dependent Pipeline Transients
Lisheng Suo,E. B. Wylie +1 more
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In this paper, an effective numerical method is presented to compute transients in piping systems in which frequency-dependent parameters influence the response, such as frequency dependent friction and wave speed.Abstract:
An effective numerical method is presented to compute transients in piping systems in which frequency-dependent parameters influence the response. Frequency-dependent friction is utilized as the parameter-of-concern herein, however, the procedure can accommodate other factors such as frequency-dependent wavespeed equally well. The method, a variation in the impulse response method, is developed from the frequency response analysis and incorporates the fast Fourier transformread more
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Journal ArticleDOI
A selective literature review of transient-based leak detection methods
TL;DR: A selective literature review of transient-based leak detection methods is offered, describing the state-of-the-art in the area, providing a degree of historic perspective and categorizing the major themes in this line of research.
Journal ArticleDOI
Pipe system diagnosis and leak detection by unsteady-state tests. 1. Harmonic analysis
Marco Ferrante,Bruno Brunone +1 more
TL;DR: In this paper, the wavelet transform is used to detect local singularities in the pressure time history due to the presence of a leak, which reveals the arrival time of the reflected pressure wave and is the basis for leak location.
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Velocity Profiles and Unsteady Pipe Friction in Transient Flow
TL;DR: In this paper, the velocity profiles recorded during these transient events clearly show regions of flow recirculation, flow reversal, and an increased intensity of fluid turbulence, and the experimental pressures are compared to a water hammer model using a conventional quasi-steady representation of head loss.
Journal ArticleDOI
Experimental verification of the frequency response method for pipeline leak detection
TL;DR: The optimum measuring and generating position for two different system boundary configurations—a symmetric and an antisymmetric system—are discussed in the paper and the analytical expression for the leak-induced pattern in these two cases is derived.
Journal ArticleDOI
Computation of energy dissipation in transient flow
TL;DR: In this article, a new model for the computation of unsteady friction losses in transient flow is developed and verified for laminar and turbulent flows and the comparison of measured and computed pressure heads shows excellent agreement.