| 研究課題/領域番号 |
16H07043
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| 研究機関 | 九州大学 |
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研究代表者 |
Sivasankaran H. 九州大学, カーボンニュートラル・エネルギー国際研究所, 助教授 (50782546)
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| 研究期間 (年度) |
2016-08-26 – 2018-03-31
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| キーワード | nanoscale heat transport / phase change |
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| 研究実績の概要 |
Surfaces with varying morphology is fabricated using conventional techniques. The wettability of the substrates is modified using appropriate chemical treatments. Surfaces prepared using such techniques was characterized using SEM/TEM to visualize the patterns. Atomistic level characterization was performed using X-ray spectroscopy and raman spectroscopy.To know the initial wettability and roughness parameters, contact angle goniometry and 3D laser scanning microscopy was used. If coatings are used instead of lithographic patterns to manipulate wettability, atomic force microscopy was used to measure the surface roughness. The existing TDTR facility at Kyushu university is being modified to perform the impinging droplet measurements. We are currently at the stage of including a high temperature heater to perform thermal measurements at temperatures above the vaporization point of pure fluids. Experiments are being performed for pure fluids and mixed fluids at room temperature for calibration purpose.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
3: やや遅れている
理由
the optical setup needs a significant change and the corresponding data analysis for the proposed work is quite challenging.
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| 今後の研究の推進方策 |
Combination of optical thermometry using the two photon absorption and time domain thermoreflectance will enable to capture the dynamics of surface temperature and interfacial thermal resistance between droplet and heated substrate. This may enable us to understand the underlying physics at high frequency rates which will enable us to develop a phase diagram for the droplet impingement studies based on Weber number.
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