| Budget Amount *help |
¥24,050,000 (Direct Cost: ¥18,500,000、Indirect Cost: ¥5,550,000)
Fiscal Year 2019: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2018: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
Fiscal Year 2017: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
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| Outline of Final Research Achievements |
We have investigated the microbubble generation and the flow around the bubble by using the photothermal property of a gold nanoisland film. By using our originally developed apparatus, we have succeeded in capturing the self-oscillation of a water vapor microbubble and have found that the oscillation is the critical factor of the rapid flow generation. Besides, we demonstrated the control of the direction of the flow around the bubble via the shape of the heating spot. Using this method, we successfully generated one-directional flow in a microchannel. Furthermore, using an alcohol-water mixture, the concentration gradient was induced using a temperature gradient, which generates a surface tension gradient and enhances the flow speed around the bubble.
These findings are useful for the development of microscale cooling devices.
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