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The onset of instability induced by impulsive spin-down of the rigid-body flow placed in the gap between two coaxial cylinders is analyzed by using the energy method. In the present stability analysis the growth rate of the kinetic energy of the base state and also that of disturbances are taken into consideration. In the present system the primary flow is a transient, laminar one. But for the Reynolds number equal or larger than a certain one, i.e. Re ≥ Re G secondary motion sets in, startingdoi:10.9713/kcer.2015.53.5.609 fatcat:acdrttpst5bgzjq45gbpmc5ija