| Budget Amount *help |
¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Fiscal Year 2019: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥14,690,000 (Direct Cost: ¥11,300,000、Indirect Cost: ¥3,390,000)
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| Outline of Final Research Achievements |
Drop impact on a hot surface causes a sub-cooled boiling wave with violent bubble volume oscillations. The sub-cooled wave covers all the contact area between the drop and the surface in several milliseconds of drop impact event. We call the unique boiling phenomena in an impacting drop as impact drop boiling.In the present research, we captured in detail the dynamics of vapor bubbles in impact drop boiling with a high-speed camera and a long-distance microscope. We also developed an analytical model to describe the bubble dynamics based on the spherical bubble model. By comparing the model with experimental results on the time variations of bubble radius, we evaluated the validity of our model.
As a result, we clarified that the thermal boundary layer developed on a heated surface and the microlayer formed in between the bubble and the surface play dominant roles in the bubble dynamics in impact drop boiling.
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