The particle movement behavior in the small gap between a rotating cylinder and a fixed sleeve without axial flow has been modeled. Different particle sizes in a turbulent flow with and without Taylor vortices have been investigated. The simulation result shows that the particle movement behavior is dependent on the Stokes number of the particles as well as the properties of the fluid. At interruption of the centrifugal pump the shaft can be let in rotation with a small angular velocity to prevent sedimentation of the particles through the Taylor-Couette system entering into motor room.