Abstract
Typical structures of large scale turbulence in a pipe flow was investigated by a visualization of behaviour on a surface of dye layer on a whole bottom of a pipe with squared crosssection. The dye layer was generated by contineous injection of fluorescent dye into a viscous sublayer. 16mmcinemovie of the behaviour on a surface viewed through a transparent upper wall show the longitudinal streaks which join or separate again and again. In these behaviour, some typical patterns are found. The relations between ejection and high-speed flow are made clear from the correspondence of these typical patterns to instantaneous velocity flucuations, measured simultaneously by Laser-Doppler velocimeter.
