Slurry flow in a tower mill

► For the slurry model, a number of flow characteristics in the mill were identified specific to the fluid transport: ► A reduced solid fraction inside the screw results in a higher permeability and allows greater mobility for the fluid phase. ► Vortex structures were observed around the edges of the screw blade. ► The peak tangential speed of the slurry flow was observed to occur at a different radial position to that of the solid charge. ► Slurry pooled at the top of the charge, above the top of the screw was quiescent and largely unaffected by the rotation of the screw.