2022 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 | Viscoelasticity / Edge Fracture / Liquid Metal / Galinstan / Liquid Bridges / Elastoviscoplasticity / Rheology |
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| Outline of Annual Research Achievements |
Over the past two years, I've focused on exploring the behaviors of viscoelastic fluids, especially their formation into stable liquid bridges due to surface tension. Through high-speed imaging and numerical simulations, I have found that torsion can destabilize these bridges through a mechanism called edge fracture. This finding may enhance the efficiency of fluid dispensing in various industries, such as electronic packaging, food engineering, and additive manufacturing. This discovery extends beyond simple viscoelastic fluids to more complex thixotropic elastoviscoplastic (TEVP) fluids, showing its potential to be incorporated into improved dispensing protocols for real-world industrial fluids.
I have also delved into the issue of edge fracture as an undesirable phenomenon in rheological measurements. I demonstrated that sealing the fluid's free surface with Galinstan, a nontoxic liquid metal, can delay edge fracture. This simple yet effective solution extends the measurable shear rate range, providing a valuable tool for the broader rheological study of complex fluids.
Overall, my research contributes to a deeper understanding of viscoelastic fluid behavior and offers practical solutions to the challenges faced in their manipulation and measurement.
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| Research Progress Status |
令和4年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和4年度が最終年度であるため、記入しない。
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