Experiments on Strouhal's Number

概要

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The frequency n of eddies generated behind a circular cylinder in fluid is expressed by the equation n=S(v/d), where v is the fluid velocity, d the diameter of circular cylinder and S Strouhal's number, which has been treated as the function of Reynold's number. Many inverstigators have experimented on the values of Strouhal's number between R_6≒3×10〜5×10^5,but the values between. R_6≒2×10^4〜1×10^5 have not been obtained. The present authors have experimented on all of them between R_6≒6×10〜5×10^5 by three devices with a high speed tunnel, a low speed tunnel and a water rotating vessel respectively and have made it clear that they take nearly a value of 0.18 between R_6=1×10^4〜1×10^5,suddenly increasing to 0.3〜0.6 at the point near the critical Reynold's number R_<ec>≒5×10^5.
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