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The stability of an interface of two viscous immiscible fluids of dierent densities and confined in a Hele-Shaw cell which is oscillating with periodic angular velocityis investigated. A linear stability analysis of the viscous and time-dependent basic flows, generated by a periodic rotation, leads to a time periodic oscillator describing the evolution of the interface amplitude. In this study, we examine mainly the eect of the frequency of the periodic rotation on the interfacial instability that occurs at the interface.

Control of the Interfacial Instabilities in a circular Hele-Shaw cell oscillating with a periodic angular velocity