界面活性剤水溶液の抵抗低減流れに及ぼす微細気泡混入の影響

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ITOGAWA, Shinnichi[Abstract] It is known that small quantities of surfactant additives can greatly reduce the friction factors during the flow of a heat transfer medium. This is because the generation of turbulent vortices is suppressed by the formation of rod-like micelles, and the flow remains laminar in the high Reynolds number range. However, the values of the heat transfer coefficients decrease during flow laminarization. The research objective is to examine heat transfer enhancement effects by air injection. This paper presents an experimental investigation on the heat transfer and flow characteristics in an air-surfactant solution two-phase flow through a vertical tube. The air was injected through the porous metal or the T-joint. In each air-inlet condition, heat transfer coefficients were enhanced drastically with the injection of air into a drag-reducing surfactant solution flow. In air injection through the porous metal, the flow pattern was bubbly flow which contains many micro-bubbles in any flow rate. As the enhancement rates of heat transfer coefficient, the air injection through a porous metal was more effective than a T-joint. This result means that the apparent concentration of rod-like micelles in a surfactant solution in micro-bubbly flow was more reduced than that in any other flow pattern.
近畿大学工業高等専門学校の論文