10304 平板上境界層の発達に及ぼす界面活性剤添加の影響(OS8 流れの抵抗減少)

概要

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The effect of surfactant solutions on the boundary layer over a flat plate has been investigated in the Reynolds number range of 4.58×10^4<Re<1.52×10^5. Experiments were carried out by measuring the velocity profile using a PIV system. In addition, the results of the hot wire measurement was compared with those of PIV measurement Surfactant solutions were aqueous solutions of oleyl-bihydroxyethyl methyl ammonium chloride (trade name: Ethoquad O/12) in the concentration range of 50 to 500ppm, to which sodium salicylate was added as a counterion. It was clarified that the boundary layer thickness of surfactant solutions increases significantly comparing with that of tap water at Re>4.58×10^4. Velocity profile of the boundary layer for surfactant solutions gradually increases from the outer edge of the boundary. The result of the velocity profile of the hot wire measurement is smaller than that of PIV measurement, and the boundary layer thickness of the hot wire measurement increases comparing with that of PIV measurement.
社団法人日本機械学会の論文
2005-03-17