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2013 (Vol. 6, Issue: 04)
Article Information:

The Interaction of Oscillating-Grid Turbulence with a Sediment Layer

W.H.M. Wan Mohtar and N.M. Zakaria
Corresponding Author:  W.H.M. Wan Mohtar 

Key words:  Sediment trajectories turbulence-particle interaction, zero-mean turbulence, , , , ,
Vol. 6 , (04): 598-608
Submitted Accepted Published
August 24, 2012 September 19, 2012 June 20, 2013
Abstract:

This study described a preliminary experimental setup to identify how near-bed turbulence interacts with and moves sediment. The turbulence generated by a vertically oscillating grid was made to interact with a homogeneous horizontal sediment layer. Near-spherical particles were used throughout with two types of sediment at comparable sediment size d≈700 Ám. The interaction characteristics were investigated by employing the PIV technique to measure the velocity field of the displaced sediment grains (within the transverse plane of the bed surface) during the interaction. Measurement of the velocity of the displaced sediment grains was restricted to the θ/θ_c >1 case, where θ= τ_b/(s-1)gd is the Shields parameter, the subscript c denotes critical i.e. threshold criteria, τ_b is the mean bed shear stress and s is relative density of sediment. During the period of interaction, the sediment grains were primarily displaced by the radial velocities and formed distinctive circular trajectories. Energetic turbulence resuspends the particles above the bed surface, forming the characteristics particle splash.
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  Cite this Reference:
W.H.M. Wan Mohtar and N.M. Zakaria, 2013. The Interaction of Oscillating-Grid Turbulence with a Sediment Layer.  Research Journal of Applied Sciences, Engineering and Technology, 6(04): 598-608.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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