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Experiment study on sediment incipience in backward-facing step flow

Lookup NU author(s): Chieh-Wen Liu, Professor Longbin Tao

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Abstract

Flow over a backward-facing step is studied to investigate the role of large-scale vortex structures on sediment incipience. The transient flow velocity field at the downstream of the backward-facing step is obtained using the technique of particle tracking velocimetry (PTV). The optical amplification technique is employed to measure the instantaneous flow velocities near the bed and the instantaneous bed shear stress is obtained. The experimental observations reveal new insights into the oscillation of the large-scale structure and the three-dimensional characteristics of the flow. In particular, very high turbulence intensity, instantaneous horizontal velocity near the bed and the bed shear stress near the reattachment point were observed. The sediment incipient probability obtained from the sequent images of sediment particles near the bed revealed that the critical instantaneous shear stress of the sediment incipience is independent of flow conditions.

Publication metadata

Author(s): Liu C, Huhe A, Tao L

Publication type: Article

Publication status: Published

Journal: Journal of Hydrodynamics

Year: 2007

Volume: 19

Issue: 2

Pages: 173-179

ISSN (print): 1001-6058

ISSN (electronic): 1000-4874

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/S1001-6058(07)60045-6

DOI: 10.1016/S1001-6058(07)60045-6

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