A-224 界面活性剤抵抗低減流の発達様式

概要

論文の詳細を見る
An experimental study has been performed to investigate the developing characteristics of drag-reducing surfactant solution flow in a duct. Streamwise velocity distributions at six cross-sections were measured by LDV system. From the results, the flow development of the surfactant solution was found to be very flow. Even at the end of the test section with the distance of 112 times of hydraulic diameter from the inlet, the flow is not fully developed but still has the developing boundary layer characteristics on the duct walls. This slow development is caused by very long formation time of shear-induced state of the surfactant micelles. The present results lead a conclusion that the entry length of 1,000 times of hydraulic diameter is required for fully developed surfactant flow at least.
日本流体力学会の論文
2003-07-28