添加物による管内流の抵抗低減

抄録

In this study, drag reduction by additives in a turbulent pipe flow has been studied. Experiments were carried out using a head tank to prevent mechanical degradation, and the friction loss was evaluated from the flow rate. As a result, it was found that aqueous solutions of organic additives and suspensions of them showed high drag reduction. Drag reduction by suspensions of organic additives is as same as that by aqueous solutions, and the drag reduction by suspensions may be caused by that fibrous material. It is also found that the conductivity of the solution is not always proportional to the drag reduction rate.