抄録
THe process of generation of turbulence in oscillatory boundary layer was elucidated by flow visualization technique and compared with the results of hot-film measurement. For the flow visualization the bed of water tunnel was covered by a thin layer of milk with specific gravity 1.015(Thin layered milk method). The thickness of the layer was about 1mm. The piston-stoke was started from rest to a sinusoidal movement. The movement of milk was recorded photographically with a motor-driven camera set stationary above the tunnel. Photographs show turbulence bursts occur in each cycle of oscillatory flow which bursts are followed by the relaminarization during the same cycle.
