2016 Fiscal Year Annual Research Report
ナノスケールで制御された高温固体表面における相変化現象の解明と熱輸送制御
| Project/Area Number |
16H07043
|
|---|
| Research Institution | Kyushu University |
|---|
Principal Investigator |
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)
|
|---|
| Project Period (FY) |
2016-08-26 – 2018-03-31
|
| Keywords | nanoscale heat transport / phase change |
|---|
| Outline of Annual Research Achievements |
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.
|
| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
the optical setup needs a significant change and the corresponding data analysis for the proposed work is quite challenging.
|
| Strategy for Future Research Activity |
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.
|
