1414 粘弾性流体を対象とした圧力振動場における気泡近傍剪断速度分布の実験的評価(S30-3 複雑流体の流動現象(3),S30 複雑流体の流動現象)

概要

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A local shear rate due to a local flow of aqueous solution of sodium polyacrylate around a small bubble under mechanical pressure-oscillating was measured experimentally, which can be used to estimate an enhancement in defoaming performance of the fluids. This measurement requires experimental data of tracer velocities distributed around the bubble as well as the bubble diameter over a cyclic period; those enable us to measure the velocity gradient directly. Because the oscillation frequency was too high to record by commercial video camera, we used a high density video camera with a help of strobe scope lighting. We measured velocity field around the bubble successfully. It was found that velocity field was not the same along the bubble boundary, where the velocities in the upper region were smaller than the lower region. In addition, shear rates were compared with the estimated shear rate obtained with the simple sphere model. The estimated values were almost the same each other on the surface of bubble.
社団法人日本機械学会の論文
2007-09-07