Evaluation of Time Evolution of Mechanical Parameters of Polymeric Pipes by Unsteady Flow Runs

AbstractThe paper presents the results of the calibration, by means of a microgenetic algorithm, of the mechanical parameters of high-density polyethylene pipes, to reproduce experimental unsteady flow runs in an installation consisting primarily of a steel pipe and of an additional polyethylene pipe. The mechanical parameters of viscoelastic models are estimated using both one-dimensional and quasi-two-dimensional models. Two sets of runs carried out at a distance of about 12 years are considered. The calibration of a three-parameter Kelvin-Voigt model provides evidence of the impossibility of obtaining general results. The use of a model with a single Kelvin-Voigt element (two-parameter model) gives good results in terms of comparison between numerical and experimental results for both pressure head and velocity. The calibration for the second series of tests shows increased deformability of the material (the reduction of the elastic modulus is more than 30%). The calibrated values of the retardation ti...

[1]  Bruno Brunone,et al.  Turbulence, Friction, And Energy Dissipation In Transient Pipe Flow , 2006 .

[2]  David E. Goldberg,et al.  Genetic Algorithms in Search Optimization and Machine Learning , 1988 .

[3]  D. E. Goldberg,et al.  Genetic Algorithm in Search , 1989 .

[4]  Huan-Feng Duan,et al.  Relevance of Unsteady Friction to Pipe Size and Length in Pipe Fluid Transients , 2012 .

[5]  D. Carroll.  GENETIC ALGORITHMS AND OPTIMIZING CHEMICAL OXYGEN-IODINE LASERS , 1996 .

[6]  C. Maksimovic,et al.  The dynamic effect of pipe-wall viscoelasticity in hydraulic transients. Part I—experimental analysis and creep characterization , 2004 .

[7]  A. Blanchard,et al.  Pulsating Viscoelastic Pipe Flow - Water-Hammer , 1979 .

[8]  Silvia Meniconi,et al.  Two-Dimensional Features of Viscoelastic Models of Pipe Transients , 2014 .

[9]  Silvia Meniconi,et al.  Water-hammer pressure waves interaction at cross-section changes in series in viscoelastic pipes , 2012 .

[10]  David E. Goldberg,et al.  Sizing Populations for Serial and Parallel Genetic Algorithms , 1989, ICGA.

[11]  C. Darwin.  The Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for Life , 1859 .

[12]  Cedo Maksimovic,et al.  The dynamic effect of pipe-wall viscoelasticity in hydraulic transients. Part II—model development, calibration and verification , 2005 .

[13]  Nelson Carriço,et al.  Transient vaporous cavitation in viscoelastic pipes , 2012 .

[14]  Giuseppe Pezzinga,et al.  QUASI-2D MODEL FOR UNSTEADY FLOW IN PIPE NETWORKS , 1999 .

[15]  E. Benjamin Wylie,et al.  Fluid Transients in Systems , 1993 .

[16]  Prof.Dr.-Ing.habil. P.-G. Franke.  COMPUTATION OF UNSTEADY PIPE FLOW WITH RESPECT TO VISCO-ELASTIC MATERIAL PROPERTIES , 1983 .

[17]  J. Ferry.  Viscoelastic properties of polymers , 1961 .

[18]  Silvia Meniconi,et al.  Numerical and experimental investigation of leaks in viscoelastic pressurized pipe flow , 2012 .

[19]  Giuseppe Pezzinga,et al.  Local Balance Unsteady Friction Model , 2009 .

[20]  Ahmad Ahmadi,et al.  Fluid-structure interaction with pipe-wall viscoelasticity during water hammer , 2011 .

[21]  John H. Holland,et al.  Adaptation in Natural and Artificial Systems: An Introductory Analysis with Applications to Biology, Control, and Artificial Intelligence , 1992 .

[22]  Kalmanje Krishnakumar,et al.  Micro-Genetic Algorithms For Stationary And Non-Stationary Function Optimization , 1990, Other Conferences.

[23]  Silvia Meniconi,et al.  Energy dissipation and pressure decay during transients in viscoelastic pipes with an in-line valve , 2014 .

[24]  Giuseppe Pezzinga,et al.  Unsteady flow in hydraulic networks with polymeric additional pipe , 2002 .

[25]  H. Duan,et al.  Energy Analysis of Viscoelasticity Effect in Pipe Fluid Transients , 2010 .

[26]  Giuseppe Pezzinga,et al.  Unsteady Flow in Installations with Polymeric Additional Pipe , 1995 .

[27]  M. Ferrante,et al.  Transient hydrodynamics of in-line valves in viscoelastic pressurized pipes: long-period analysis , 2012 .

[28]  K. Weinerowska-Bords,et al.  Viscoelastic model of waterhammer in single pipeline - problems and questions , 2006 .

[29]  Yeou-Koung Tung,et al.  Unsteady friction and visco-elasticity in pipe fluid transients , 2010 .

[30]  K. Weinerowska-Bords.  Accuracy and parameter estimation of elastic and viscoelastic models of the water hammer , 2007 .

[31]  Helena M. Ramos,et al.  Surge damping analysis in pipe systems: modelling and experiments Effet d'atténuation du coup de bélier dans les systèmes de conduits: modelation mathématique et expériences , 2004 .