Experiments on Strouhal's Number

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  • ストラハル数に関する実験
  • ストラハルスウ ニ カンスル ジッケン

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Abstract

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 dealt with the function of Reynold's number. Many investigators have experimented on the values of Strouhal's number between Re≒3×10∼5×105, but the values between Re≒2×104∼1×105 have not been obtained. The present authors have experimented on all of them between Re≒6×10∼5×105 by three devices with high speed tunnel, low speed tunnel and water rotating vessel respectively and have made it clear that they take nearly a value of 0.18 between Re=1×104∼1×105 and suddenly increase 0.3∼0.6 at the point near the critical Reynold's number Rec≒5×105.

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