Abstract
In this study, investigation of development turbulent spots and patches in the transitional two-dimensional channel flow was performed by means of a moving camera that follows the flow at the bulk velocity. The flow visualization of the transitional flow made with flak particle revealed that the patch patterns are consistent and that the phase velocity of the streak structure has faster than that of the patch patterns. Both velocities are faster than the bulk velocity and slightly decrease with increasing the Reynolds number. The decreasing tendency of the velocity and the patch pattern consistency are in qualitative agreement with results of the DNS.
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