Abstract
The structure of secondary flow induced in wavy channels have been investigated by the dye injection method.
The secondary flow is a kind of Taylor-Goertler vortices observed in a curved rectangular channel. However, the wavy channel is different from the curved rectangular channel in the processes of vortex development and destruction. It is found that an ustable mode in which the vortices formed at the upper and lower walls of the channel interact leads to the vortex destruction and significantly promotes the transition of turbulence.
