Vortex finder wall area

Hydrocyclones, also called hydroclones, employ self-generated mild centrifugal forces to separate the particles into groups of predominantly small and predominantly large ones. Because of bypassing, the split of sizes is not sharp. The characteristic diameter of the product is taken as rfso, the diameter than which 50 wt % of the material is greater or less. The key elements of a hydrocyclone are identified on Figure 12.3(h). A typical commercial unit has an inlet area about 1% of the cross-sectional area between the vessel wall and the vortex finder, a vortex finder with diameter 35 40% that of the vessel, and an apex diameter not less than 25% that of the vortex finder. For such a unit, the equation for the cut point is... 

Fig. 7.1.4. Profile plots for the tangential velocity in a tangential inlet cyclone, with the area of low near-wall velocity on the back of the vortex finder indicated...

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