ボイド率のパッシブおよびアクティブな変動による乱流摩擦抵抗低減の促進(流れの制御(1),一般講演)

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  • Turbulent Frictional Drag Reduction Promoted by Passive and Active Fluctuation in Void Fraction

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We have found a significant promotion of turbulent frictional drag reduction when the void fraction of bubbles injected into the boundary layer involves temporal fluctuation. The fluctuation is induced naturally when the two-phase shear flow develops spatially in the streamwise direction. By providing the fluctuation artificially with repetitive bubble injection (RBI-technique), we have succeeded in expanding the drag reducible range regarding mean void fraction. The experimental facts demonstrating the fluctuation's effect and simplified mathematical description are reported here.

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