VELOCITY AND SUSPENSION CONCENTRATION IN SEDIMENT-MIXED FLUID

1 INTRODUCTION AND REVIEW Numerous investigations related to vertical velocity and suspension concentration distributions have been undertaken to the steady, uniform, open channel turbulent flow. The problems of sediment mixed water flows are of direct interest to the practical situations in the field of river sedimentation, coastalsediment transport and in the field of two-phase flow in particular. In hydraulic open channel flow, the vertical velocity profile is usually described by…

VELOCITY AND SUSPENSION CONCENTRATION IN SEDIMENT-MIXED FLUID

The present paper is focussed on the effects of viscous and turbulent shear stresses on both vertical velocity and concentration distributions in large suspension of sands. When the flow carries large amount of sediments in suspension, the properties of fluid mixture are changed in terms of modified viscosity, density and fall velocity, and hence the flow characteristics. Theoretical models have been developed for both velocity and concentration profiles, taking into account the viscous and turbulent shear stresses, which are the function of volumetric concentration. Comparison of theoretical models with experimental data reveals that (i) the modified velocity and concentration profiles agree well with the observed data for high suspension, (ii) the higher the sediment suspension, the smaller the von-Karman constant, and (iii) sediment diffusion coefficient is less than momentum diffusion coefficient for fine sands in suspension.