| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2010: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2009: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2008: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
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| Research Abstract |
The purpose of the present project is to clarify fundamental phenomena of solid particles, microbubbles, and acoustic streaming in the case of irradiating ultrasonic waves onto solid-liquid two-phase mixtures or microbubbles-liquid mixtures with a circular plate-ultrasonic transducer. The information is needed for numerical analyses. The following results were obtained : Acoustic streaming in a mixture of nylon particles and tap water resembles that in liquid streaming, so called Eckart flow (acoustic streaming). On the other hand, the behavior of microbubbles and acoustic streaming in a mixture of microbubbles and water were greatly changed by the ultrasonic frequency. This was explained by the directionality of a circular plate-ultrasonic transducer. Microbubbles were affected by the acoustic radiation force and did not always follow the liquid flow. Hence, one must analyze liquids and microbubbles separately.
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