| Budget Amount *help |
¥24,830,000 (Direct Cost: ¥19,100,000、Indirect Cost: ¥5,730,000)
Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2015: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2014: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
Fiscal Year 2013: ¥10,140,000 (Direct Cost: ¥7,800,000、Indirect Cost: ¥2,340,000)
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| Outline of Final Research Achievements |
An experimental technique in combination with numerical simulation was developed, which allows one to study multiple-scale characteristics in the dynamics of cavitation bubbles in viscoelastic materials. Micron-sized bubble nuclei were produced by focusing infrared laser pulses into gelatin gels and their size was precisely controlled through mass transfer of dissolved gases; the gel viscoelasticity was measured from microscopic observation of individual cavitation bubbles arising from these nuclei and its comparison to Rayleigh-Plesset-type calculation. Furthermore, a cloud of cavitation bubbles arising from shock-microbubble interaction in gelatin gels was visualized as macroscopic observation. The threshold pressure of the cloud cavitation inception was inferred from comparison of the experiment to compressible fluid flow simulation.
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