| Budget Amount *help |
¥23,660,000 (Direct Cost: ¥18,200,000、Indirect Cost: ¥5,460,000)
Fiscal Year 2019: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2018: ¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
Fiscal Year 2017: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
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| Outline of Final Research Achievements |
A measurement technique in combination with theory and simulation was developed, which enables one to quantify statics and dynamics of cavitation bubbles in viscoelastic solids. Micron-sized bubble nuclei were produced by focusing laser pulses into a gelatin gel under dissolved-gas supersaturation and their size was controlled based on mass diffusion. Statics of these nuclei and ultrasound-induced dynamics of spherical cavitation bubbles were obtained from a series of visualization experiments with varying the nucleus size. Effects of viscoelasticity on nonlinear dynamics of spherical bubbles in the gel can be quantified, with comparison to nonlinear bubble dynamics model of Plesset type.
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