Author(s): Terunori Ohmoto; Liany Hendratta
Linked Author(s): Terunori Ohmoto
Keywords: Non-Newtonian fluids; Open channel flow; Dune type bed; The Yellow River; Mudflows
Abstract: The necessity to understand and predict flows that carry large suspended sediment and wash loads has become acute in the Yellow River Basin where significant erosion and siltation associated with hyperconcentrated flood give rise to many river problems. Mud flows, debris flows or slurries, made up of a large amount of clay and/or silt particles suspended in water, often show nonNewtonian properties but remain poorly understood concerning the impacts of their rheological properties on fully developed turbulent structure. In this paper, we experimentally investigated the effects of non-Newtonian fluid on the separation vortex over fixed dune type bed by using Particle Image Velocimetry (PIV). The results showed that rheological properties significantly dissipated the turbulent flow fluctuations over the dune bed and augmented the flow resistance by comparison with the clear water flow.
Year: 2011