Annular liquid height

Figure 19.15. The liquid thermal diffusion system for the recovery of heavy sulfur isotope in carbon disulfide. The conditions prevailing at the time after 90% 34S is reached. Each rectangle in the cascades represents a column, each height being proportional to the length of the column. The two cascades have a combined height of 14 m, annular dia 25.4 mm, and annular width 0.18-0.3 mm. Production rate of 90% concentrate of 34S was 0.3 g/day [IV. M. Rutherford, Ind. Eng. Chem. Proc. Des. Dev. 17, 17-81 (1978)].

A viscous suspension contains particles of a solid of 1461 kg/m density, and is to be clarified by centrifugation. The liquid has a density of 801 kg/m and a viscosity of 100 cp. 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 169.92 L/h, when the centrifuge runs at 23,000 rpm speed. 

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