| 研究実績の概要 |
Quantum dots(QDs) are applied into two-dimensional temperature and velocity distribution measurement in a micro-scale particle image velocimetry(PIV) system.
In order to establish the combined temperature and velocity measurement method and theory for micro-scale flow field based on QDs, the temperature distribution inside a Y-shape micromixer during the mixing process is measured. After the calibration process, hot solution and cold solution mixed with each other at the junction of the micromixer, and the temperature in this region is obtained.
It is difficult to measure flow distribution in micro channel through the usage of nano particles. Brownian motion which is an irregular motion of small particles, results in measurement errors during experiments. To solve this problem, time-averaged values are extracted.
For the first step, temperature and velocity distributions are measured by commercial fluorescent particles and QDs solution at the same time. Fluorescence of QDs is applied to measure the temperature distribution. Program used for image processing is improved during the post-processing.
On other hand, temperature and velocity measurement is attempted by combining polystyrene particles (1μm in diameter) with QDs, which velocity vectors are obtained by the motion of polystyrene particles and temperature is calculated by the fluorescence of QDs. As a conclusion, synthetic method of polystyrene particles and QDs should be improved for high accuracy measurement in the future.
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| 今後の研究の推進方策 |
Validate the proposed quantitative flow visualization technique based on quantum dots and summarize its advantages and disadvantages.
The numerical simulation on the Y-shaped micromixer, which has the same aspects and conditions as the system used during the experimentation will be carried out, applying a commercial heat transfer softwares. Therefore, the obtained experimental results can be compared with the numerical results to validate the proposd quantitative flow visualization technique and summarize its advantages and disadvantages. Eventually, the combined temperature and velocity measurement method and theory for small-scale flow field based on quantum dots will be established.
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