Two-Dimensional Features of Viscoelastic Models of Pipe Transients
Publication: Journal of Hydraulic Engineering
Volume 140, Issue 8
Abstract
Transients in pressurized polymeric pipes are analyzed by means of a two-dimensional (2D) Kelvin-Voigt viscoelastic model, calibrated by means of a microgenetic algorithm on the basis of pressure traces. The reliability of the proposed model is then tested by comparing numerical and experimental profiles of the axial component of the local velocity, the latter measured by means of an ultrasonic Doppler velocimeter. Differences between transients in viscoelastic and elastic pipes are pointed out by considering a 2D model in which an elastic behavior is assumed for pipe material. The comparison between the two 2D models allows attribution of the faster decay of pressure oscillations and velocity profiles to viscoelasticity because of the time-shift between pressure oscillation and retarded circumferential strain. The 2D analysis shows that the viscoelastic model generally presents flatter velocity profiles with respect to the elastic model.
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Acknowledgments
This research has been supported by (1) the Italian Ministry of Education, University and Research under the Projects of Relevant National Interest Advanced analysis tools for the management of water losses in urban aqueducts, and Tools and procedures for an advanced and sustainable management of water distribution systems; and (2) Fondazione Cassa Risparmio Perugia under the project Hydraulic characterization of innovative pipe materials (No. 2013.0050.021).
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Information
Published In
Journal of Hydraulic Engineering
Volume 140 • Issue 8 • August 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jan 26, 2013
Accepted: Feb 13, 2014
Published online: Apr 23, 2014
Published in print: Aug 1, 2014
Discussion open until: Sep 23, 2014
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