Abstract
At the fundmental study on the three dimensional turbulent structures, visualization technique by particle tracer methods were used.
Experiment have done in the rectanguler open channel for a small aspect ratio (B/H=0.5). In oder to visualise scondary flow patern and terbulent structures from inner region to outer region, particle tracer methods and vertical ( or horizontal ) light sheet methods were used.
In this paper relation between the mechanism of wall turbulence and the mechanisms of secondary flows are discribed in detaile.
