time tu having established the critical space ec and the available time tu we can now obtain the velocity at which a particle must be travelling to be u201c captured u201d in the collection cells 41 of the grill 34 or to be expelled directly into the accumulation chamber 13 we can extract the rpm rotation frequency necessary to obtain this velocity using the following logic the coefficient of viscosity of the medium in relation to the temperature u03b7 in cp centipoise as we have already mentioned we prefer to initially maintain the structural parameters constant which it will be necessary to change depending on performance and dimensions required the difference between recs and rics u03b4r which we have named u201c critical space u201d ec having established the cross section and the critical space that we would like the separation chamber to have we can determine the radius through applying the following formula where r is the external radius of the separation chamber recs and a is the cross section of the separation chamber acs m is the mass of the revolving body onto which the centrifugal force is applied r is the radius of the rotation plane around which the body turns the stokes formula calculates for the velocities we are interested in the highest velocity v that a spherical body can attain having the radius r propelled by a force f in equilibrium with an equal resistance that is generated by the viscosity of the medium in which the movement occurs whose coefficient is u03b7 in centipoise cp v 4 u03c0 2 m r t 2 6 u03c0 r u03b7.