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Experiments are performed to understand the nature of Hopf bifurcations in rectangular low-density jets. Results showed that the rectangular low-density jet could undergo a transition from a globally stable state to a globally unstable state through the subcritical Hopf bifurcation in addition to the supercritical Hopf bifurcation. There is a critical aspect ratio of rectangular low-density jets above which Hopf bifurcations are supercritical. Below the critical aspect ratio, the rectangular low-density jets undergo subcritical Hopf bifurcations for a range of jet-to-ambient density ratios, and outside this range, the Hopf bifurcations are supercritical.
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