Process water of density 1000 kgm–3 and viscosity 0.001 Nsm–2 containing spherical particles with a diameter of 30 μm and a density of 2800 kgm–3 are to be separated in a continuously operated...

Process water of density 1000 kgm^–3
and viscosity 0.001 Nsm^–2
containing spherical particles with a diameter of 30 μm and a density of 2800 kgm^–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.