G122 過剰に対イオンを添加した界面活性剤溶液流の発達様式(G-12 流れの抵抗低減(2),一般講演)

概要

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Experimental study on drag-reducing surfactant solution flow with excess addition of counter-ion has been performed in order to investigate the mechanism of drag reduction occurrence. In this report, the development characteristics of mean and fluctuating streamwise velocity measured by using LDV system were highlighted for the case when the counter-ion molar ratio to the surfactants. ξ[-], was kept at 100. From the comparison with the previous results when ξ=1.5, the mean velocity profile becomes closer to that of developed laminar flow and the peak value of fluctuating intensity becomes lower, in spit of the fact that the friction coefficient in the case of ξ=100 shows the same level drag reduction as that in the case of ξ=1.5 Especially, the fluctuating intensity near the wall decreases along the flow direction, and becomes smaller than the initial value observed at the center position of flow inlet. From this, it is found that the high level fluctuation observed in the case of ξ=1.5 does not relate to the drag reduction occurrence. The drag reduction is concluded to occur mainly due to the flow laminarization.
日本流体力学会の論文
2004-08-09