G112 内面溝付管における流れの抵抗低減効果(G-11 流れの抵抗低減(1),一般講演)

概要

論文の詳細を見る
An experimental study of drag reduction of turbulent flows in grooved pipes such as inner-finned-tubes has been carried out for dilute water solutions of polyacrylamide, polyethylene oxide, and surfactant (TTAB). Two types of grooved pipes with inside diameter of about 4mm and 11mm are used. When the grooved pipes are used, friction factors for water increase more than 35% (type1) and 15% (type2) at high Reynolds number range, while remarkable drag reduction can be seen with all solutions. Friction factors for polymer solutions and the surfactant solution in the grooved pipes are very close to that of the smooth pipe, which means drag reduction rate is higher than that of the smooth pipe and its value amounts to 80%. This fact may not lead to the improvement of the heat transfer coefficient of grooved pipes.
日本流体力学会の論文
2004-08-09