抵抗低減効果に対する界面活性剤及び対イオン濃度の影響(非ニュートン(2),一般講演)

概要

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Experimental studies on the relaxation characteristics of drag-reducing surfactants have been performed. The relaxation time after a certain shear addition was measured by a cone-plate type rheometer in order to investigate the effect of the concentration of surfactants and counter-ions in the aqueous solution. The concentration of surfactants, oleylbishydroxyethylmethylanmonium chloride, was changed from 300 to 4,000ppm, while the molar ratio of counter ions, sodium salicylate, to surfactants ranged from 1.5 to 100. From the results, it was found that the relaxation behavior of surfactant solution causing drag reduction shows multi-mode relaxation with several relaxation times and that the larger relaxation time decreases with the molar ratio of counter-ions and with the concentration of surfactants. The number of relaxation times was also found to decrease with the molar ratio of the counter-ions and concentration of surfactants but the shortest relaxation time remains in the cases of the drag reduction occurrence. From this, the relaxation behavior with the shortest relaxation time was concluded to cause drag reduction phenomena.
日本流体力学会の論文
2008-09-04