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

屈服应力粘弹性流体高精度、高速打印方法的开发

• 批准号: 21J10517
• 负责人: Chan San To
• 金额: $ 0.96万
• 依托单位: Okinawa Institute of Science and Technology Graduate University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2021
• 资助国家: 日本
• 起止时间: 2021-04-28 至 2023-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21J10517/
• 关键词: Viscoelasticity; Edge Fracture; Liquid Metal; Galinstan; Liquid Bridges; Elastoviscoplasticity; Rheology; 流体工学; レオロジー

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.

在过去的两年里，我专注于研究粘弹性流体的行为，特别是它们在表面张力作用下形成稳定的液桥。通过高速成像和数值模拟，我发现扭转可以通过一种叫做边缘断裂的机制破坏这些桥梁的稳定。这一发现可能会提高电子封装、食品工程和增材制造等各个行业的流体分配效率。这一发现不仅适用于简单的粘弹性流体，也适用于更复杂的触变弹粘塑性（TEVP）流体，显示了将其纳入改进的工业流体分配方案的潜力。我还深入研究了边缘断裂作为流变测量中的不良现象的问题。我证明了用Galinstan（一种无毒的液态金属）密封液体的自由表面可以延缓边缘断裂。这种简单而有效的解决方案扩展了可测量的剪切速率范围，为更广泛的复杂流体流变学研究提供了有价值的工具。总的来说，我的研究有助于更深入地了解粘弹性流体的行为，并为其操作和测量面临的挑战提供实用的解决方案。

项目成果

Edge fracture instability of viscoelastic liquid bridges

粘弹性液桥边缘断裂失稳

• 发表时间: 2021
• 作者: San To Chan; Frank P. A. van Berlo; Hammad A. Faizi;Atsushi Matsumoto; Simon J. Haward; Patrick D. Anderson;and Amy Q. Shen
• 通讯作者: and Amy Q. Shen

Torsional instability of constant viscosity elastic liquid bridges

• DOI: 10.1039/d1sm01804c
• 发表时间: 2022-02-07
• 期刊: SOFT MATTER
• 影响因子: 3.4
• 作者: Chan, San To;Varchanis, Stylianos;Shen, Amy Q.
• 通讯作者: Shen, Amy Q.