A viscous suspension contains particles of a solid of 1461 kg/m3 density, and is to be clarified by centrifugation. The liquid has a density of 801 kg/m3 and a viscosity of 0.1 kg/m sec. A clarifying centrifuge with bowl 44.5 diameter and 197 mm height is used. During operation an annular air core of 14.23 mm diameter is formed. Calculate the cut point for a capacity of 4.7245 10-5 m3/sec, when the centrifuge runs at 23,000 rpm speed.