Title: A Unified Strouhal-Reynolds Number Relationship for Laminar Vortex Streets Generated by Different Shaped Obstacles,
Abstract: A new Strouhal-Reynolds number relationship, $St=1/(A+B/Re)$, has been
recently proposed based on observations of laminar vortex shedding from
circular cylinders in a flowing soap film. Since the new $St$-$Re$ relation was
derived from a general physical consideration, it raises the possibility that
it may be applicable to vortex shedding from bodies other than circular ones.
The work presented herein provides experimental evidence that this is the case.
Our measurements also show that in the asymptotic limit
($Re\rightarrow\infty$), $St_{\infty}=1/A\simeq0.21$ is constant independent of
rod shapes, leaving $B$ the only parameter that is shape dependent.