水中の微小気泡の上昇挙動に及ぼす汚れの影響 : 流体工学,流体機械

概要

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The effect of contamination on rising speed of a spherical air bubble in purified water was investigated experimentally. We developed an experimental system that uses a CCD camera coupled with a microscope. By measuring the bubble size and rising speed, we can precisely estimate the drag coefficients of the bubble below Reynolds Number of 100 in the water, where the concentrations of Total Organic Carbon (TOC and particles were controlled. The results show that the bubble behaves as fluid sphere under the condition where the concentrations of both TOC and particles (>φ0.5μm) are less than, respectively, 7 ppb (=μg Carbon/l) and 11/ml. The drag coefficients of the bubble approach to those of solid particle as the concentrations of TOC and particles in the water increase.
一般社団法人日本機械学会の論文
2001-04-25