S0501-3-4 圧力振動場における複数気泡の相互作用(複雑流体の流動現象(2))

概要

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Interaction between two small bubbles placed in the vertical direction under pressure-oscillating field was investigated experimentally. Pressure oscillating to a quartz cell from the bottom through the rubber sheet pressed by a vibration generator is effective, for enhancing rising velocity of a small bubble in viscous shear-thinning fluids. 4 types of fluid of different rheological property are selected and tested. With a help of strobe scope lighting, we successfully monitored trace of the moving bubbles clearly by a high density video camera. Relative rising velocity ε of the bubbles and non-dimensional acceleration G_b are measured. It was found that rising velocity of the lower bubbles was higher than that of the upper bubble; that was strongly enhanced in the closer case; and finally the bubbles moved together, whereas natural rising velocity of the bubbles are same each other.
社団法人日本機械学会の論文
2009-09-12