Secondary Flow and Vortex Motions near the side-wall of Rectangular Open Channel

In this paper secondary flow and vortex motions near the side-wall have been discussed on the basis of experimental results obtained by velocity measurements and flow visualizations. Vortex motions and cross flows have been observed and the results show that they make an important role to determine the structure of flow. Type (a) secondary flow defined by Bradshaw (1987) as “cross flow” is also identified within “stress -induced” secondary flow. Secondary flow can affect the structure of near wall turbulence.