Abstract
The hydrogen-bubble method was applied to visualizing turbulent pipe flow in the range of Re from 5×103 to 1.5×104. Platinum wires were set in a pipe cross-section so as to form a regular polygon periphery, from which hydrogen bubbles were generated continuously. The hydrogen bubbles were visualized by lightening cross-section to observe them from downstream by TV camera and their fluctuating bahavior recorded on video tapes was analized using personal computer image processing system.Mean value of circumferential intervals between adjacent bursts decreases as the radial position of the platinum wires for generation of hydrogen bubbles approaches wall and has a limiting value of ?? 100 in the vicinity of the wall. Difference between flow structures in the buffer region and the turbulent region has been clearly indicated by drawing quasi-3D space-time profiles and contours of fluctuation of hydrogen bubbles.
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