Complex Wavespeed and Hydraulic Transients in Viscoelastic Pipes

Li-sheng, Suo; Wylie, E. Benjamin

doi:10.1115/1.2909434

Cited by 58 publications

(24 citation statements)

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“…To model the pipe wall viscoelastic effects for transient pressure waves, instead of the use 221 of an additional term for the retarded strain, * a was used in the classic continuity equation 222 for elastic pipes to replace the elastic wave speed (Rieutord 1982;Suo and Wylie 1990 the mechanical characteristics of viscoelastic pipelines (an instantaneous elastic strain 236 followed by a retarded strain) lead to a frequency-dependent wave speed. As a result, the 237 pipeline viscoelasticity is more suitable to be analyzed in the frequency domain, where the 238 pipe response to loadings with various frequencies can be studied independently.…”

Section: Ve F E I T T Amentioning

confidence: 99%

Determination of the Creep Function of Viscoelastic Pipelines Using System Resonant Frequencies with Hydraulic Transient Analysis

et al. 2016

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16The determination of the creep (compliance) function of viscoelastic pipelines is essential 17 for modelling their hydraulic behavior and accurately predicting pressure responses under 18 transient events. This paper proposes a novel frequency-domain technique for the 19 determination of the creep function of viscoelastic pipelines using hydraulic transients. A 20 viscoelastic pipeline system, when compared with a frictionless elastic pipeline under the 21 same system configuration, has non-uniformly shifted resonant frequencies. Analytical 22 1 analysis shows that the shift in the resonant frequencies of a viscoelastic pipeline system is 23 related to both the pipe wall viscoelastic compliance effects and the unsteady wall shear 24 stress effects. A technique is developed to determine the elastic wave speed and the 25 viscoelastic creep compliances based on the shifted system resonant frequencies. To 26 improve the accuracy of the calibration for the viscoelastic parameters, an approach is 27proposed to correct the shifting in the resonant frequencies induced by the unsteady friction 28 before the calibration. Numerical simulations conducted on a high-density polyethylene 29 (HDPE) pipeline verify that the elastic wave speed and viscoelastic compliance can be 30 determined with relatively high accuracy. 31

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Section: Ve F E I T T Amentioning

confidence: 99%

Determination of the Creep Function of Viscoelastic Pipelines Using System Resonant Frequencies with Hydraulic Transient Analysis

et al. 2016

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“…The viscoelasticity of the polycarbonate may affect the wave speed and damping (Meißner & Frank 1977;Gally, Güney & Rieutord 1979;Suo & Wylie 1990;Covas et al 2004). The unsteady wall friction may also have some impact on the wave damping (Bergant 2001).…”

Section: Theoretical Predictionsmentioning

confidence: 99%

Shock propagation through a bubbly liquid in a deformable tube

et al. 2011

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Shock propagation through a bubbly liquid contained in a deformable tube is considered. Quasi-one-dimensional mixture-averaged flow equations that include fluid-structure interaction are formulated. The steady shock relations are derived and the nonlinear effect due to the gas-phase compressibility is examined. Experiments are conducted in which a free-falling steel projectile impacts the top of an air/water mixture in a polycarbonate tube, and stress waves in the tube material and pressure on the tube wall are measured. The experimental data indicate that the linear theory is incapable of properly predicting the propagation speeds of finite-amplitude waves in a mixture-filled tube; the shock theory is found to more accurately estimate the measured wave speeds.

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“…Their analytic model compared well with the experimental results over a frequency range of 0-3 kHz. In addition to their developed model, the data was compared with the visco-elastic model developed by Suo and Wylie [84] in which the axial motion of the pipe was neglected; it was shown that Suo and Wylie's model approximated the experimental data below frequencies of 1 kHz.…”

Section: Rachid and Stuckenbruck [75] Combined A Kelvin-voigt Linear mentioning

confidence: 99%

Fluid transients and fluid-structure interaction in flexible liquid-filled piping

Wiggert

Tijsseling

2001

Applied Mechanics Reviews

176

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Fluid-structure interaction in piping systems (FSl) consists of the transfer of momentum and forces between piping and the contained liquid during unsteady flow. Excitation mechanisms may be caused by rapid changes in flow and pressure or may be initiated by mechanical action of the piping. The interaction is manifested in pipe vibration and perturbations in velocity and pressure of the liquid. The resulting loads imparted on the piping are transferred to the support mechanisms such as hangers, thrust blocks, etc. The phenomenon has recently received increased attention because of safety and reliability concerns in power generation stations, environmental issues in pipeline delivery systems, and questions related to stringent industrial piping design performance guidelines. Furthermore, numerical advances have allowed practitioners to revisit the manner in which the interaction between piping and contained liquid is modeled, resulting in improved techniques that are now readily available to predict FSI. This review attempts to succinctly summarize the essential mechanisms that cause FSI, and present relevant data that describe the phenomenon. In addition, the various numerical and analytical methods that have been developed to successfully predict FSI will be described. Several earlier reviews regarding FSI in piping have been published; this review is intended to update the reader on developments that have taken place over the last approximately ten years, and to enhance the understanding of various aspects of FSI. Tables (1-2) 79

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Complex Wavespeed and Hydraulic Transients in Viscoelastic Pipes

Cited by 58 publications

References 0 publications

Determination of the Creep Function of Viscoelastic Pipelines Using System Resonant Frequencies with Hydraulic Transient Analysis

Determination of the Creep Function of Viscoelastic Pipelines Using System Resonant Frequencies with Hydraulic Transient Analysis

Shock propagation through a bubbly liquid in a deformable tube

Fluid transients and fluid-structure interaction in flexible liquid-filled piping

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