Experimental Study on the Velocity Dependent Drag Coefficient and Friction in an Automatic Ball Balancer

Abstract

The paper presents the evaluation of experiments on the drag and friction forces in an automatic ball balancer, which raceway is embodied by the outer ring of a ball-bearing. Due to the throughout contact between the balls andtheracewaywhileoperatingtheballbalancer,efforthasbeenmadetocharacterisetheflowconditionsofthe surrounding fluid by determining the drag coefficient ?? as a function of the Reynolds number Re. By the use of fluids with different viscosities and the postulation of continuity in the run of ??(Re), coefficients for different friction models, e.g. Coulomb friction and rolling friction deduced from Hertzian surface pressure equation can bederived.