Predicting the Numerical and Experimental Open-Channel Flow Resistance of Corrugated Steep Circular Drainage Pipes
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VIEW CORRECTIONPublication: Journal of Pipeline Systems Engineering and Practice
Volume 8, Issue 3
Abstract
This paper studies flow resistance characteristics of corrugated circular drainage pipes through experimental measurements and numerical calculations under turbulent uniform open-channel flow conditions. The Manning roughness coefficient is determined for corrugated pipes where semicircular ribs are placed on the inner surface of the pipe periodically with different height-to-pitch ratios. Numerical simulations are conducted for circular pipes having diameters of 0.6, 0.8, 1.2, 1.6, and 2.2 m and a slope of 7% with discharges varying between 0.1 and . Results of the numerical calculations are validated in terms of Manning’s by full-scale experiments. In this way, experiments are conducted for smooth and corrugated pipes of 0.8 m diameter, where two distinct inner corrugation profiles and various flow rates are employed. It is found that the Manning roughness coefficient can be increased significantly, which is a favorable outcome with regard to reducing the abrasive effect of water by lowering its velocity to more plausible values for steep slopes in an underground pipe network. Considering the numerical results, a new correlation between Manning’s and the height-to-pitch ratio of corrugation is proposed.
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Acknowledgments
This work was supported by the Scientific and Technological Research council of Turkey (TUBITAK) and Mir Research and Development Co. The study was a part of the TUBITAK 1007 project with the number of 109G002.
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Journal of Pipeline Systems Engineering and Practice
Volume 8 • Issue 3 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jul 14, 2016
Accepted: Nov 10, 2016
Published online: Feb 7, 2017
Discussion open until: Jul 7, 2017
Published in print: Aug 1, 2017
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