On resuspension of spherical particles from rough and smooth surfaces by a wall-normal vortex

Title

On resuspension of spherical particles from rough and smooth surfaces by a wall-normal vortex

 Author

Shnapp, R.
Liberzon, A.

Date

2015-08-28

 Abstract

A three-dimensional particle tracking velocimetry (3D-PTV) method was applied to study in details the single-particle resuspension (lift-off) events of large spherical particles. In order to increase statistics, we have utilized a wall-normal, tornado-like vortex that lifted the particles from surfaces of different roughness. Analyzing the three-dimensional particle trajectories, velocities and accelerations before, during and after the resuspension events, the resuspension efficiency was obtained directly. The results show that the lift-off efficiency from the rough surface is significantly higher than from the smooth one. We suggest a simplified mechanistic model based on the mobility parameter that can predict this peculiar effect. This study can lead to improved modeling of resuspension rates from smooth and rough beds.

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http://resolver.tudelft.nl/uuid:73179716-2c90-49b2-a705-b1ffb045ef70

 Part of collection

Conference proceedings

 Document type

conference paper

 Rights

(c) 2015 the Authors
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