Abstract
The solids concentration profiles in a slurry mixing tank with mechanical agitation have been measured by using a photo-electric method. The concentration profile has been explained by the sedimentation-dispersion model in which the slurry flow in a stirred tank with a flat-disk turbine or a marine propeller is assumed to be dominated mainly by the upflow. The model parameters, modified Peclet numbers, Pe s in terms of the falling velocity of the solid particles and Pe f in terms of the liquid flow velocity, have been markedly influenced by the amount of the solids suspended. The Peclet number Pe s is proportional to the solids concentration in the stirred tank under the present experimental conditions, while the parameter ratio Pe f/Pe s, which coincides with the ratio of the liquid flow velocity to the falling velocity of the solid particles, approaches a constant value as the concentration of solid particles is increased to 20vol.% or more.
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