Abstract
Experimental have done in rectangular open channel for a small aspect ratio (B/H=0.5). In oder to visualiaze the secondary flow and the turbulent structures from inner region to outer region, vertical (or horizontal) light sheet and particle tracer methods were used. Pictures of flow patterns were digitized and culculated by a computer. The distributions of velocity component, two-dimentional divergence and vorticity components were displayed. By using of long period of turbulent structures, a model of space structures of secondry flow is proposed. Relation between the mechanism of wall turbulence and the mechanisms of secondary flow are described in detail.
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