ERI: Unraveling Multi-Phase Ink Shear-Thinning Flow Mechanism in Direct Ink Writing Process: Computational Fluid Dynamics Simulation and In-Situ Experimental Verification

ERI：揭示直接墨水书写过程中的多相墨水剪切稀化流动机制：计算流体动力学模拟和原位实验验证

• 批准号: 2347497
• 负责人: Zipeng Guo
• 金额: $ 19.98万
• 依托单位: Rochester Institute of Tech
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-05-01 至 2026-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2347497&HistoricalAwards=false
• 关键词: ERI; Unraveling; Multi; Phase; Ink

Direct ink writing (DIW) emerges as an agile additive manufacturing method capable of fabricating functional materials into three-dimensional structures. During the DIW printing process, multi-phase ink, which combines solid-, liquid-, and gas-phase ingredients, introduces complex fluid dynamics to allow for the fabrication of parts with enhanced properties. Potential applications include electronics, aerospace, and biotechnology. This Engineering Research Initiation (ERI) award supports a comprehensive research effort to link the DIW process parameters with ink property. If successful, the project will provide new understanding of the rheological behavior of multi-phase inks used for extrusion-based 3D printing in general. The impact will extend beyond the research outcomes and empower valuable education for graduate, undergraduate, and underrepresented groups in science, technology, engineering, and mathematics (STEM) fields. The outreach activities will promote broader participation and inspire students to pursue careers in advanced manufacturing. This research project aims to unravel the shear-thinning flow mechanism of multi-phase inks in the DIW process. The current understanding of multi-phase ink primarily relies on macroscopic rheological properties, resulting in a gap between macroscopic understanding and microscopic fluid dynamics. The effort seeks to fill in this gap by discovering the fundamental knowledge of the interaction between ink shear-thinning rheological properties and DIW processing parameters via three research tasks. Task 1 focuses on establishing and implementing computational fluid dynamics (CFD) simulation for multi-phase inks. Task 2 uses the established model to evaluate rheology properties. A key research question to be addressed is how to accurately simulate the interactions among various ink components and predict rheological properties. Task 3 develops In-situ sensing for experimental verification. Simulation models will be validated using in-situ sensing and post-manufacturing characterization. The fluid dynamics data, including the flow trajectory, ink velocity, and shear rate, will be collected using a particle imaging velocimetry (PIV)-based setup. The comparison between CFD simulations and experiments could provide new insights into process control. The new knowledge to be discovered from this research will facilitate broader adoption of the DIW technology and impact the other fields of engineering.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

直接墨水书写 (DIW) 作为一种灵活的增材制造方法而出现，能够将功能材料制造成三维结构。在 DIW 打印过程中，多相墨水结合了固相、液相和气相成分，引入了复杂的流体动力学，可以制造具有增强性能的零件。潜在的应用包括电子、航空航天和生物技术。该工程研究启动 (ERI) 奖项支持将 DIW 工艺参数与油墨特性联系起来的综合研究工作。如果成功，该项目将为基于挤出的 3D 打印所使用的多相油墨的流变行为提供新的认识。其影响将超越研究成果，并为科学、技术、工程和数学 (STEM) 领域的研究生、本科生和代表性不足的群体提供有价值的教育。外展活动将促进更广泛的参与，并激励学生在先进制造领域追求职业生涯。该研究项目旨在揭示 DIW 工艺中多相油墨的剪切稀化流动机制。目前对多相墨水的认识主要依赖于宏观流变特性，导致宏观认识与微观流体动力学之间存在差距。该项目旨在通过三项研究任务发现油墨剪切稀化流变特性与 DIW 加工参数之间相互作用的基础知识，从而填补这一空白。任务 1 重点是建立和实施多相墨水的计算流体动力学 (CFD) 模拟。任务 2 使用已建立的模型来评估流变特性。需要解决的一个关键研究问题是如何准确模拟各种油墨成分之间的相互作用并预测流变特性。任务 3 开发用于实验验证的原位传感。将使用现场传感和制造后表征来验证仿真模型。流体动力学数据，包括流动轨迹、墨水速度和剪切速率，将使用基于粒子成像测速 (PIV) 的设置进行收集。 CFD 模拟与实验之间的比较可以为过程控制提供新的见解。从这项研究中发现的新知识将促进 DIW 技术的更广泛采用，并影响其他工程领域。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力优点和更广泛的影响审查标准进行评估，被认为值得支持。