VELOCITY AND SUSPENSION CONCENTRATION IN SEDIMENT-MIXED FLUID
摘要
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 vonKarman constant,and (iii) sediment diffusion coefficient is less than momentum diffusion coefficient for fine sands in suspension.