1. A mixture of quartz and lead glance particles is to be separated into pure components by hindered settling process. The particles are in the size range 1575m, what should be the minimum apparent density of the fluid that will ensure their complete separation. Assume that the shapes of the quartz and lead glance are similar. Discuss the effect of viscosity of the fluid on the minimum required density. Density of quartz: 2650kg/m3, Density of lead glance: 7560kg/m3