D124 水乱流中におけるクラスタを形成する沈降固体微粒子の挙動に関する実験的研究

概要

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Simultaneous visualization is carried out for depositing fine copper particles and fluorescent tracer particles in turbulent water flow in a horizontal duct. The visualization images are captured by a color video camera. PIV and PTV techniques are applied to the images of the reflected light from the depositing particles and those of the fluorescence of the tracer particles, respectively. It is found that increases in the streamwise and downward mean velocities and a decrease in the streamwise turbulence intensity. This is mainly caused by some clusters, which modify near-wall coherent structure, and some other clusters, which fall with higher velocity than the still-fluid settling velocity and are elongated in the vertical direction.
日本流体力学会の論文
2001-07-31