Wall Shear Stress in Transient Turbulent Pipe Flow by Local Velocity Measurement
Publication: Journal of Hydraulic Engineering
Volume 136, Issue 10
Abstract
The modeling of unsteady wall shear stress plays a crucial role in the analysis of fast transients in pressurized pipe systems, since it allows to evaluate transient energy dissipation properly. The main aim of this paper is to give a contribution to the understanding of transient pressurized flow dynamics in turbulent regime by measuring not only pressure but also the instantaneous axial velocity profile at two sections of the laboratory pipe. Specifically, by means of ultrasonic Doppler velocimetry—a completely nonintrusive technique—instantaneous velocity gradients at pipe wall are measured allowing to evaluate the time history of the actual wall shear stress by coupling velocity measurements to a two-zone stress model. As a result, the behavior of accelerating and decelerating flows with respect to the corresponding steady ones, i.e., with the same value of the discharge, is pointed out. Due to the characteristics of the laboratory pipe—a 352-m long high density polyethylene pipe—transients phenomena are investigated both at short and long time scales.
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Acknowledgments
This research has been jointly supported by the Italian Ministry of Education, University and Research (MIUR) under the Project of Relevant National Interest “Innovative criteria for the sustainable management of water resources in the water distribution systems,” and by Fondazione Cassa Risparmio Perugia.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 136 • Issue 10 • October 2010
Pages: 716 - 726
Copyright
© 2010 ASCE.
History
Received: Mar 24, 2009
Accepted: Mar 27, 2010
Published online: Mar 30, 2010
Published in print: Oct 2010
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