| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Outline of Final Research Achievements |
The present study deals with bubble oscillations in an elastic tube to understand the bubble dynamics in a blood vessel. An analytical model for N spherical bubbles interacting with the tube wall is developed, in which the bubbles and the tube wall are represented by sources and spring-mass system, respectively. The natural frequencies for a single bubble or N bubbles in the tube are derived by linearizing the governing equations. The resonance frequencies of bubbles in various configurations are discussed. The influences of mass of the side wall per unit area, tube length, and initial bubble arrangements on the resonance frequencies are clarified. Also, behavior of acoustic liposomes (ALs), which are microbubbles coated by lipid membrane, are observed in a standing sound field of 110 kHz with a high speed video camera. The ALs reveal the surface oscillations of nth mode (n= 3, 4, 5, 6, 7) with a half period of the sound field, which are induced by the parametric excitation.
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