Abstract
The bifurcation time scale for the onset and the decay between Couette flow and the Taylor-vortex flow is investigated by the numerical approach. The lengths of the coaxial two cylinders are finite and the flow develops between the outer and inner cylinders. The development of the flow amplitude is assumed to obey the Landau equation, and the time constants in entire azimuthal sections are evaluated by fitting the time series of the velocity components to the solution of the equation. The time constant of the decay flow is more than three times larger when it is compared with the time constant of the onset flow. It also shows larger value at the inner region, and the value is small near the end wall of the cylinder where Ekman Layer appears.
