| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Outline of Final Research Achievements |
The aim of this research it to find local flow structure around 1 micro-litter bubble(s) under pressure oscillating field. We tried measuring the retardation profile near the bubble(s) by the high speed polarization camera, as well as flow visualization experiments using tracer particles. It turns out that there is a uniaxial extension behind each bubble, and strong retardation can be seen at the region. Due to expansion and contraction of the bubbles, there are complex flow structures in the vicinity of bubbles in a viscoelastic fluid. We have studied the effect of a pressure-oscillation source position on the motion of bubbles.It turned out that an uniaxial extension was observed in the opposite side of the movement direction of the contracting bubble. It was considered that strong retardation and the motion of fine bubbles were suggested to generate negative wake. The similar flow structure was observed around a bubble in a continuous flow channel.
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