抵抗低減界面活性剤水溶液流れに及ぼす空気混入の影響

概要

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It is known that small quantities of surfactant additives can greatly reduce the friction factors during the flow of a heat transfer medium. The friction factors are reduced 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 heat transfer coefficients decrease during flow laminarization; as a result, heat exchangers with a larger heat transfer area will be required. The research objective is to study the heat transfer enhancement effect of air injection. This paper presents an experimental investigation of the heat transfer and flow characteristics of an air-surfactant solution two-phase flow through a vertical tube. In the experiment, air was injected through a porous metal or a T-joint. The experimental results are as follows. In each air-inlet condition, heat transfer coefficients were enhanced drastically with the injection of air into a drag-reducing surfactant solution flow. In the case of air injection using porous metal, the flow patterns were almost bubbly flow at all flow rates. With regard to the enhancement rate of heat transfer coefficients, air injection through porous metal was more effective than that through the T-joint. This result shows that the apparent concentration of the surfactant solution in the bubbly flow was considerably less than that in any other flow patterns, because the surfactant molecules were concentrated at the bubble-water interface.
日本実験力学会の論文

抵抗低減界面活性剤水溶液流れに及ぼす空気混入の影響

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概要

日本実験力学会 | 論文

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