Richard J. Munro
Sediment resuspension and erosion by vortex rings
Munro, Richard J.; Bethke, N.; Dalziel, S. B.
S. B. Dalziel
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|
|Peer Reviewed||Peer Reviewed|
|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|
|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.
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf