高分子添加剤とリブレットとの複合系における乱流速度分布の測定

概要

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In the combined system of polymer additives and riblets, the polymer additives expand the range of non-dimensionalized riblet width s^+ where the riblets reduce the frictional drag. Although in the higher region of s^+ the riblets increase the frictional drag as the rough surface, the polymer additives thicken the wall layer, which dumps the drag increase due to riblets and then gives the benefical combined effect in this higher region of s^+. Based on this scinario, the velocity profile and the pipe frictional coefficient for the combined system were derived from the velocity profile of each system. The turbulent velocity profiles were measured for the combined system using a laser Doppler velocimetry. The measured results agreed well with the derived prediction for the combined system.
2000-03-25