Suction Effects on Sediment Transport in Closed-Conduit Flows
Publication: Journal of Hydraulic Engineering
Volume 140, Issue 5
Abstract
Laboratory experiments were conducted to investigate the influence of suction on sediment transport in closed-conduit flows in this study. The results show that the bed load transport rate essentially remains unchanged for small values of suction rates before abruptly increasing beyond a certain threshold. Theoretical analyses of the forces acting on a spherical particle also are conducted and a conceptual model set up to analyze suction effects on particle mobility by considering the near-bed velocities. The model hypothesizes that (1) the bed particle experiences an additional downward vertical drag force induced by suction; and (2) increasing suction will lead to larger horizontal and vertical near-bed velocities, which enhances both the driving force and effective weight of the particle. To qualitatively examine how suction affects the near-bed flow behavior, physical modeling capability software was used to simulate the physical system and the results confirm that the near-bed velocities increase with suction.
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Acknowledgments
This research is conducted under a project sponsored by Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, and Nanyang Technological University. The financial support for the research is gratefully acknowledged.
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Published In
Journal of Hydraulic Engineering
Volume 140 • Issue 5 • May 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Feb 5, 2013
Accepted: Oct 11, 2013
Published online: Oct 14, 2013
Published in print: May 1, 2014
Discussion open until: Jul 18, 2014
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