Experimental Study on the Velocity Dependent Drag Coeﬃcient and Friction in an Automatic Ball Balancer
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 𝐶𝐷 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 𝐶𝐷(Re), coeﬃcients for diﬀerent friction models, e.g. Coulomb friction and rolling friction deduced from Hertzian surface pressure equation can bederived.
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