Decrease of Streamwise Mean Velocity of Single Spheres due to Presence of a Sparse Network of Immobile Bed-Mounted Particles
Publication: Journal of Engineering Mechanics
Volume 146, Issue 11
Abstract
The transport of spheres as a bed-load through a sparse network of immobile, bed-mounted submerged cylinders was experimentally studied to quantify how the mean velocity of the spheres in the streamwise direction is altered, with respect to transport in a bare bed. Two regimes of transport were observed: (1) a tracer-type motion regime in which the spheres are able to circumvent the cylinders with few collisions between them and (2) a collisional regime in which impacts play a key role in predicting the experimental results. It was quantified as the critical value of a dimensionless parameter, below which the first regime takes place, whereas the second one triggers above this value. This parameter plays a central role in a one-dimensional (1D) model, which includes a dissipative force based on the average contact work between moving and motionless particles. At a critical flow velocity, all the spheres stopped, remaining motionless within the network, suggesting the appearance of a threshold for the onset of the spheres motion due to the network.
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Data Availability Statement
All data and model generated and used during the study appear in the published article and are available upon request.
Acknowledgments
The authors gratefully acknowledge the financial support (UBACyT20020100100853) from Universidad de Buenos Aires, Argentina.
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Information & Authors
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Published In
Journal of Engineering Mechanics
Volume 146 • Issue 11 • November 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Mar 19, 2019
Accepted: Jun 25, 2020
Published online: Sep 15, 2020
Published in print: Nov 1, 2020
Discussion open until: Feb 15, 2021
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