Earlier studies allowed the present authors to divide the period of synchronization into three stages of operation: viscous, mixed and dry. Expressions for estimating the pressure, axial, force, torque and friction coefficent were obtained. This investigation allows the determination of the initial values necessary for the study of the second stage presented here. The second stage occurs in the presence of a variable friction coefficient for which a model is proposed. The influence of the variable friction coefficient on the velocity and duration of synchronization is presented. The theoretical model is compared with experimental results.
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