Hydraulic Transients in Viscoelastic Branched Pipelines
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VIEW THE REPLYPublication: Journal of Hydraulic Engineering
Volume 141, Issue 8
Abstract
Plastic pipes are widely used in pressurized water systems. Their viscoelastic behavior has to be taken into account in the design phase as well as in the interpretation of water-hammer signals for diagnostic purposes. The aim of the present paper is to experimentally investigate the transient waves’ transmission and reflection in branched networks of high density polyethylene (HDPE) pipes and to test the efficacy of a viscoelastic model for the interpretation of the results. Two laboratory Y-shaped systems were built in the Water Engineering Lab of the University of Cassino and Southern Lazio (Italy) and a set of water-hammer tests was conducted on them. A significant variation of transmission and reflection coefficients at the pipe junction is observed in comparison with the values suggested in classical textbooks. The strong agreement between the experimental pressure values and those obtained using the viscoelastic model suggests that the differences from the classical theory are due to the viscoelastic behavior of the material, since unsteady friction effects are negligible in the investigated scenarios.
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Published In
Journal of Hydraulic Engineering
Volume 141 • Issue 8 • August 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jul 28, 2014
Accepted: Mar 2, 2015
Published ahead of print: Apr 27, 2015
Published online: Apr 28, 2015
Published in print: Aug 1, 2015
Discussion open until: Sep 28, 2015
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