加熱円柱近傍後流に及ぼす音波の影響　　膜温度の動粘性係数を使ったレイノルズ数の妥当性について

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  • 岡本 覚
    新居浜工業高等専門学校機械工学科

書誌事項

タイトル別名
  • The effects of sound waves on the near wake of a heated circular cylinder. Appropriateness for the Reynolds number used the fluid kinematic viscosity in the film temperature.
  • カネツ エンチュウ キンボウ コウリュウ ニ オヨボス オンパ ノ エイキョウ
  • Appropriateness for the Reynolds Number Used the Fluid Kinematic Viscosity in the Film Temperature
  • 膜温度の動粘性係数を使ったレイノルズ数の妥当性について

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説明

An experimental investigation has been carried out to study acoustic interferences in vortex-shedding from a heated circular cylinder in a crossflow subjected to the acoustical vibrations whose direction is normal to the axis of the cylinder, and in particular, to inspect the appropriateness for the Reynolds number (Re*) used the fluid kinematic viscosity in the film temperature. The results indicate that the acoustic frequencies which produce powerful effects on vortex-shedding from the heated circular cylinder correspond to the frequencies of laminar-turbulent transition wave in a separated shear layer from an isothermal circular cylinder over the Re* range. The effects of the acoustical vibrations are similar to the effects of the acoustical vibrations directed along the axis of the cylinder on the vortex-shedding, and their vibrations bring the vortex region formed in the wake close to the cylinder surface, and increase the spanwise correlation of the wake.

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