S0501-1-1 極低Re数域の円柱周りの流れに及ぼす界面活性剤添加の影響(複雑流体の流動現象(1))

概要

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To clarify the effects of surfactant solutions on the drag coefficient of a circular cylinder, the flow past a circular cylinder was investigated at 0.6 <Re <20 by measuring the drag and by visualizing the flow. The diameters of test cylinder were 2 and 5 mm. Surfactant solutions were aqueous solutions of oleyl-methyldihydroxyethyl ammonium chloride in the concentration range of 200 to 500 ppm with sodium salicylate. It was clarified that the drag coefficient of the circular cylinder in surfactant solutions increases comparing that in tap water. The inception Reynolds number of the drag increase was also clarified. The flow visualization results showed that the drag of surfactant solutions increases because of the existence of the wide stagnant zone around the cylinder. The drag coefficient of the circular cylinder in surfactant solutions was dependent principally on the parameter U/d (=mean velocity/cylinder diameter).
2009-09-12