2021 Fiscal Year Annual Research Report
降伏応力粘弾性流体の高精度高速プリンティング手法の開発
| Project/Area Number |
21J10517
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| Research Institution | Okinawa Institute of Science and Technology Graduate University |
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Principal Investigator |
Chan San To 沖縄科学技術大学院大学, 科学技術研究科, 特別研究員(DC2)
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| Project Period (FY) |
2021-04-28 – 2023-03-31
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| Keywords | 流体工学 / レオロジー |
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| Outline of Annual Research Achievements |
In the last fiscal year, I constructed an experimental setup which consists of two parallel plates. One of which is rotatable, another one of which can be moved vertically; between which a droplet of the rheological complex fluid can be injected. The first type of fluid considered was silicone oil, which has relaxation time of O(1 ms) and can be considered as weakly viscoelastic. The second type of fluid considered was a dilute solution of high molecular weight polystyrene dissolved in oligomeric styrene, which has relaxation time of O(1 s) and can be considered as highly viscoelastic. Two research papers were published in PNAS and Soft Matter in 2021 and 2022, respectively.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
I consider the progress as above expectation as two new publications were published during last fiscal year. The first one was published in PNAS, in which we showed that torsion can be used to destabilize weakly viscoelastic liquid bridges quickly and cleanly. The second one was published in Soft Matter, in which we showed that torsion can destabilize highly elastic liquid bridges as well, which greatly extended the range of application of our proposed method.
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| Strategy for Future Research Activity |
After showing that torsion can be used to destabilize elastic liquid bridges effectively, the next step is to see if the method also applies to other rheological complex liquid bridges, in particular, liquid bridges made of thixotropic elastoviscoplastic (TEVP) fluids, as most inks used in the industry are made of such material.
In face, preliminary experiments have already been performed. And the results show that torsion can indeed be used to destabilize TEVP liquid bridges. I am now collaborating with a postdoc in our laboratory who will perform numerical simulations to explain my experimental observations. After that, a manuscript will be written and submitted within the fiscal year.
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