Taylor-Couette flow
= Taylor-Couette flow
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{wiki=Taylor–Couette_flow}
<Taylor-Couette flow> is the flow between coaxial rotating cylinders. Its simplest steady homogeneous purely azimuthal viscous state has <steady circular Couette profile> $v_\phi=Ar+B/r$. Stability of that base state depends on rotation rates, geometry and viscosity; the inviscid <Rayleigh centrifugal stability criterion> addresses axisymmetric centrifugal disturbances, not every viscous instability.