Motion of two viscous immiscible incompressible liquids in a rotating cylinder

The shape of the interface is determined using the boundary layer method and the position of the center of mass of the liquid and the value of the braking torque exerted by the liquid on the walls of the rotating cylinder are calculated.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 1, pp. 92–99. January–February, 1990.