Abstract
It becomes widely known that there are low speed streaks and high speed streaks in the linear sublayer. Though low speed streaks is the origin of the bursting process, it is not clear how this pattern of low speed streaks is matched to the more random secondary motions. Until now, authors have visualized the attractive imbricate shape motion in the wall layer by flow visualization method named AMD and have investigated the relation between this pattern and bursting phenomenon. AMD flow visualization method is one of the mixing tracer method, this tracer is constituted of Aluminum dust, condensed milk, and dye water. One of the feature is the selection of the visualizing object by means of the regulation of the injecting liquid. In this paper low speed streaks in the linear sublayer is visualized and considered by means of the combination of flow visualization methods, e.g. AMD method, Alminium dust method, hydrogen bubblemethod.
