Author(s): Juan Antonio García Aragón

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Abstract: A hydraulic shear stress model for a uniform, steady flow on a slope of a mixture of water and a granular material al high concentration is presented here. The model includes stresses generated by particle-particle interactions along with those generated by fluid-bed interaction. Some results from the kinetic theory for granular flow are introduced to modify Bagnold's model for dispersive stresses. The model was verified experimentally by means of an inclined channel where silica-sand, supplied by a hopper, mixes with a uniform, steady water flow. Channel slopes range from 19 to 23 degrees. An interesting finding was obtained in the experiments presented here: there is not a continuous increase in velocity with depth of flow as stated by Manning's formula for the whole range of concentrations. The hydraulic model is able to reproduce the shape of the velocity vs. How depth curve and gives some insight about the mechanical behavior of the flow.

DOI: https://doi.org/10.1080/00221689609498459

Year: 1996