Experimental Study of the Transient Flow in a Coiled Pipe Using PIV
Publication: Journal of Hydraulic Engineering
Volume 143, Issue 3
Abstract
A comprehensive knowledge of energy dissipation during the accelerations and decelerations in transient flow is essential to develop robust and accurate hydraulic transient solvers. Currently, most transient solvers are not accurate enough to describe the physical phenomenon, tending to underestimate observed energy dissipation. The current paper aims to contribute to a better understanding of transient flow by measuring instantaneous velocities using 2D particle image velocimetry (PIV) and discussing key features of the mean and of the turbulent flow. Measurements were carried out at the middle section of a coiled copper pipe for Reynolds and Dean numbers of 7,000 and 1,040, respectively. In steady-state flow, the time-averaged velocity profiles have shown a strong asymmetry, with maximum axial velocity in the outer bend region of the pipe, caused by the centrifugal force. During transient flow, the ensemble-averaged velocity profiles have clearly shown regions with strong gradients near the pipe wall and reverse flow. The direction of flow is firstly reversed in the inner bend region of the pipe. The unsteady wall shear stress is different for the outer and inner wall, and is lower than in the steady state, confirming that energy dissipation cannot be estimated based on steady-state formulae for the wall shear stress.
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Acknowledgments
The work was partially funded by FEDER, program COMPETE, and by national funds through Portuguese Foundation for Science and Technology (FCT) project RECI/ECM-HID/0371/2012 and by national funds through the Portuguese Foundation for Science and Technology (FCT) under project PTDC/ECM/112868/2009.
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Published In
Journal of Hydraulic Engineering
Volume 143 • Issue 3 • March 2017
Copyright
©2016 American Society of Civil Engineers.
History
Received: Oct 2, 2015
Accepted: Aug 3, 2016
Published online: Oct 19, 2016
Published in print: Mar 1, 2017
Discussion open until: Mar 19, 2017
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