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We present measurements of the fluid velocity in a rotating Couette-Taylor system of aspect ratio L near 1. At small angular speed ω of the inner cylinder, the system contains a symmetric vortex pair. As ω increases, the vortex boundary moves off center, and a suitably defined order parameter ψ becomes nonzero. This bifurcation changes from forward to backward as L is increased. Results for ψ agree quantitatively with the predictions of a Landau model for tricritical behavior.
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Aitta et al. (1985) studied this question.
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