Concentration changes in a suspension settling under gravity

3 Concentration changes in a suspension settling under gravity 

Let a mass = p v of powder be dispersed in a mass m = pjVjOf fluid, p and V being density and volume respectively. 

Initially the mass concentration will be uniform and equal to  

Consider a small horizontal element at depth h. At the commencement of sedimentation, the particles leaving the element are balanced by the particles entering it from above. When the largest particles present in the 

It is assumed that the difference between v and is negligible compared with Vj-. Thus a graph of C(h,t) / C(h,0) agamst d t gives the percentage undersize Stokes diameter by weight. 

---