Abstract
A method is proposed to practically formulate Strouhal numbers as a function of non-dimensional tube pitches combining Rosenhead's theory of Karman vortex street in finite breadth channels and the well-known characteristics of the actual free Karman vortex street. Two examples of its actual application are shown. The first is the formulation of fundamental Strouhal numbers which are considered to be those of Karman streets controlling the drag in the steady flow of tube bundles. As the numerical values of the formula were set tentatively using limited data from the literature allowing some uncertainties, the values and range of validity should be further verified reflecting future experiments. The second is the formulation of the well-known Chen's chart of Strouhal numbers measured by the resonance method.
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