G123 界面活性剤添加による抵抗低減現象に及ぼす乱流秩序構造の影響(G-12 流れの抵抗低減(2),一般講演)

概要

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The characteristics of vortex structure and turbulent events of drag-reducing surfactant solution flows in a two-dimensional channel have been studied using particle image velocimetry to measure the instantaneous velocity fields in a streamwise-wall-normal plane. Through visualizing the instantaneous velocity field and contour of the swirling strength, the characteristic angle of vortex packets was quantified. It was shown that the drag-reducing surfactant additive reduced both the strength and frequency of turbulent bursts near the wall, and that the characteristics of vortex structures and bursts were not only dependent on drag-reduction level but also on concentration of additive. From the quantified parameters characterizing turbulent events in a wall-bounded turbulent flow, it was obtained that turbulent contribution to the friction factor was linearly proportional to the product of frequency and strength of turbulent events.
日本流体力学会の論文
2004-08-09