On calculating the stopping time of a cylindrical body rotating in a viscous continuum and the time of entrainment of a coaxial external cylinder

The velocity distribution in the vicinity of the surface of an axisymmetric body rotating in a viscous medium at frequency $\omega$ directed along its axis is determined. The dissipative function has been calculated and used for deriving the equation of motion, from which an analytic expression for the stopping time of the body (until its complete stoppage) is obtained. The time of entrainment of an external stationary cylinder coaxial with the body is calculated by solving the time-dependent Navier–Stokes equation.