| 研究課題/領域番号 |
21K14080
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| 研究機関 | 沖縄科学技術大学院大学 |
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研究代表者 |
CARLSON Daniel 沖縄科学技術大学院大学, マイクロ・バイオ・ナノ流体ユニット, ポストドクトラルスカラー (50896256)
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| 研究期間 (年度) |
2021-04-01 – 2023-03-31
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| キーワード | Microfluidics / elastic turbulence / micro-tomographic PIV / viscoelasticity / flow instability |
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| 研究実績の概要 |
The research targets for FY2021 were centered on developing the methodology for three-dimensional (3D) reconstruction of elastic turbulence (ET) and delineating the transition to ET in a given flow geometry. We have manufactured a novel device via laser-induced etching which permits a multi-scale study of ET over sequential micro-contractions. We have successfully leveraged micro-tomographic particle image velocimetry (PIV) of a dilute poly(acrylamide) flow to quantify the first spatiotemporal description of ET and relate the transition to ET to enhanced pressure drop across the geometry.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
Imaging flow through the device requires tight refractive index matching (RIM) between the glass device and the flow. We have formulated the optimal viscoelastic solutions to precisely achieve RIM with a desired solvent concentration of glycerol in water. To remove the solid from the 3D PIV reconstruction, we have developed a new masking protocol by aligning an x-ray micro-tomography of the device with the flow volume. We refined the experimental protocol for pressure measurements, which required the unplanned purchase of a pump unit. We show the transition from viscoelastic instability to ET, confirmed via spectral analysis of the pressure signal. In the ET state we have time-resolved flow fluctuations and found positive feedback between instability and streamline curvature.
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| 今後の研究の推進方策 |
Research has progressed more efficiently than expected, and we have partially met a goal of FY2022: relating ET local flow structures to pressure drop. Experiments are continuing to determine polymer stress feedback on the local flow field.
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| 次年度使用額が生じた理由 |
A target equipment model (oscilloscope) was determined to not be effective for this project, and we purchased a different oscilloscope. However, there was also an unplanned purchase of a fluid pump unit for better pressure measurements. The remaining balance will cover an open-access fee for publishing FY2021 results.
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