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Sediment resuspension and erosion by vortex rings

Munro, Richard J.; Bethke, N.; Dalziel, S. B.

Authors

Richard J. Munro

N. Bethke

S. B. Dalziel



Abstract

Particle resuspension and erosion induced by a vortex ringinteracting with a sediment layer was investigated experimentally using flow visualization (particle image velocimetry), high-speed video, and a recently developed light attenuation method for measuring displacements in bed level. Near-spherical sediment particles were used throughout with relative densities of 1.2–7 and diameters (d)(d) ranging between 90 and 1600 μm1600 μm. Attention was focused on initially smooth, horizontal bedforms with the vortex ring aligned to approach the bed vertically. Interaction characteristics were investigated in terms of the dimensionless Shields parameter, defined using the vortex-ring propagation speed. The critical conditions for resuspension (whereby particles are only just resuspended) were determined as a function of particle Reynolds number (based on the particle settling velocity and dd). The effects of viscous damping were found to be significant for d/δ

Journal Article Type Article
Journal Physics of Fluids
Print ISSN 1070-6631
Electronic ISSN 1070-6631
Publisher AIP Publishing
Peer Reviewed Peer Reviewed
Volume 21
Issue 4
Institution Citation Munro, R. J., Bethke, N., & Dalziel, S. B. (in press). Sediment resuspension and erosion by vortex rings. Physics of Fluids, 21(4), doi:10.1063/1.3083318
DOI https://doi.org/10.1063/1.3083318
Publisher URL http://scitation.aip.org/content/aip/journal/pof2/21/4/10.1063/1.3083318
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.

The following article appeared in Sediment resuspension and erosion by vortex rings
Munro, R. J. and Bethke, N. and Dalziel, S. B., Physics of Fluids, 21, 046601 (2009) and may be found at http://dx.doi.org/10.1063/1.3083318.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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