| Project/Area Number |
18K13703
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 19020:Thermal engineering-related
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| Research Institution | Kyushu University |
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Principal Investigator |
オレホン ダニエル 九州大学, カーボンニュートラル・エネルギー国際研究所, 助教 (40726246)
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| Project Period (FY) |
2018-04-01 – 2019-03-31
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| Project Status |
Discontinued (Fiscal Year 2018)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Keywords | Total Internal Reflect / Dropwise Condensation / Solid-Liquid Interface / Droplet Deweeting / Droplet Jumping / Wavelength Intensity / Condensate-Surf Interact / Condensate-Oil Interact / TotalInternalReflection / Droplet Dewetting |
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| Outline of Annual Research Achievements |
A new experimental setup combining Total Internal Reflection methodology coupled with optical microscopy was proposed to observe closely the dynamic interactions between condensing drops and solid surfaces. Visualisation setup consisting of a long working distance optical microscope lens Keyence VH-Z50L (spatial resolutions 6.1 x 4.6 mm^2 at 50x, 610 x 460 microns^2 at 500x coupled with a CCD camera (500 frames per seconds) was built.
Optical microscopy was applied to image condensation of drops on lubricant infused surfaces LIS. By shifting the plane of view/focus using a micrometer x-y stage the first experimental observations looking directly at the solid-liquid/gas interface were acquired. Observations at the solid-liquid/gas interface reveal the intimate interactions between condensing drops and the solid structures as well as the intimate interactions between the condensing drops and the oil. Observations put forward the lower solid-condensate direct interactions in the case of hierarchical micro-/nano-structured LIS when compared to solely nano-structured LIS. The lower direct drop-solid interactions offer in turn lower adhesion of the condensate to the lubricant infused hierarchical surface inducing the shedding of smaller drops when compared to nano-structured LIS, which is characteristic of high heat transfer.
Due to short duration of the grant since the PI moved to a new academic position at The University of Edinburgh, the second part of the setup comprising; laser, sapphire cooling stage, halogen lamps, optical microscopy side view, was not completely finalised.
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