A cyclone separator is used to separate (spherical) sand grains 40 microns in size (sp. Gr., 2.2) from an airstream at 1500C . If the cyclone body is 0.6m in dia. and the average tangential velocity is 16m/s, calculate the radial velocity near the wall (settling velocity under centrifugal acceleration). How much greater this value is than the terminal velocity in gravitational settling?

please i need deep explanation for this problem especially for comparing the termianl velocity with the radial velocity in showin numbers