Process water of density 1000 kg.m-3 and viscosity 0.001 N.s.m-2 containing spherical particles with a diameter of 30 m and a density of 2800 kg.m-3

Process water of density 1000 kg.m-3 and viscosity 0.001 N.s.m-2 containing spherical particles with a diameter of 30 μm and a density of 2800 kg.m-3 are to be separated in a continuously operated centrifugal separator. If the bowl of the separator has an inner diameter of 25 cm and rotates at 2000 rpm, for which the inner surface of the centrifuged liquid has a diameter of 5 cm, determine the time it takes to separate the particles.