| 研究開始時の研究の概要 |
Dispensing of viscoelastic fluids is common in applications like electronic packaging, food engineering and additive manufacturing. However, viscoelasticity leads to problems like slow liquid bridge breakup, stringiness and satellite droplets generation. In my research, I show that torsion can break short, capillary stable liquid bridges quickly. My study is the first attempt to take advantage of edge fracture (an often undesired viscoelastic flow instability) to benefit practical applications, which will potentially lead to new and improved fluid dispensing protocols.
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| 研究実績の概要 |
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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