Author(s): Yi Lu, Kit Ming Lam
Linked Author(s): Yi LU
Keywords: Sediment transport, settling velocity, turbulent flow, Particle image velocimetry (PIV), particle tracking velocimetry
Abstract: This paper reports an experimental investigation on the settling velocities of heavy particles of sub-millimeter size in a water flow with organized eddy motions. The eddies are generated in the flow of a laboratory flume using a set of vibrating shutters. Instantaneous movements of the fluid phase and the solid particle phase are measured with time-resolved particle image velocimetry (PIV) and particle tracking velocimetry (PTV), respectively. The averaged settling velocity of the heavy particles is found to be reduced with increasing vibration frequency of the shutters, probably due to the vortex trapping effect. At the highest vibration frequency, the settling velocity becomes about 15% lower than that in still water
Year: 2017