GOALI: Collaborative Research: Non-invasive measurement of kinematics and rheology in a drying complex fluid

目标：协作研究：干燥复杂流体中运动学和流变学的非侵入性测量

• 批准号: 1931636
• 负责人: Christopher Wirth
• 金额: $ 23.34万
• 依托单位: Case Western Reserve University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1931636&HistoricalAwards=false
• 关键词: GOALI; Collaborative; Research; Non; invasive

Coatings impact many applications, including consumer products, medicine, food, and engineering applications, typically serve one of three purposes: to protect and extend the life of a product, to improve aesthetics, or to add new functionality. Small defects that form during solidification of a fluid film coating can harm the ultimate functionality of the coating. In a single automotive plant, painting accounts for 60% of the energy consumption, and refinishing to repair defects can cost more than $10 million/year. There are few methods capable of non-invasive tracking of the coating properties during drying. The objective of this project is to develop the capability to measure the transient viscosity and flow of a drying coating with time- and space- resolved optical measurements. The underlying knowledge gained via this project in relation to how transient rheology affects fluid flow will be applicable to a multitude of coating manufacturing processes. The project will have significant impact on coatings design and processing, help to bridge the gap between academia and industry, and include outreach to the science, technology, engineering, and math communities.The research objective of this proposal is to measure the transient rheology and kinematics of a drying complex fluid. Traditional macroscopic rheological techniques require physical contact with the coating during the measurement (i.e. the technique is invasive and alters drying) and are unable to spatially resolve rheological changes within the coating. This project will be enabled by non-invasive, high temporal and spatial resolution optical techniques to measure the time- and space-resolved rheology and flow in model complex fluids. Specifically, the research goals are to (1) measure the spatial dependence of rheology in a drying thin film with varied viscosity, (2) to determine and implement a suitable method of convection correction for thin films of drying viscoelastic fluids, and (3) to measure the impact of formulation and substrate angle on the transient convection cell structure and related microstructure formation in thin films of drying viscoelastic fluids. The proposed work on model ~0.100 mm thin films will be applicable to a broad set of applications and will complement ongoing work the industrial partner, PPG. When successful, this research will significantly enhance the design and processing of coatings for a wide range of applications.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.

涂料会影响许多应用程序，包括消费产品，药品，食品和工程应用，通常提供三个目的之一：保护和延长产品的寿命，以改善美学或增加新功能。在凝固过程中形成的小缺陷会损害涂层的最终功能。 在单个汽车工厂中，绘画占能源消耗的60％，修复缺陷的修复费用可能会超过1000万美元。 在干燥过程中，很少有能够对涂料特性进行非侵入性跟踪的方法。 该项目的目的是开发能够通过时间和空间分辨的光学测量来测量干燥涂层的瞬时粘度和流动的能力。通过该项目获得的有关瞬态流变影响流体流动方式的潜在知识将适用于多种涂料制造过程。该项目将对涂料的设计和处理有重大影响，有助于弥合学术界和行业之间的差距，并包括对科学，技术，工程和数学社区的宣传。该提案的研究目标是衡量干燥复合体流体的瞬时流变学和运动学。传统的宏观流变技术需要与测量过程中的涂层进行物理接触（即该技术是侵入性和变化的干燥），并且无法在涂层内空间解决流变学变化。该项目将通过非侵入性，高时空和空间分辨率的光学技术来启用，以测量模型复杂流体中时间和空间分辨的流动性和流动。具体而言，研究目标是（1）测量具有多种粘度的干燥薄膜中流变学的空间依赖性，（2），确定并实施了一种适当的对流校正方法，用于干燥粘弹性流体的薄膜，（3）测量配方和底物对瞬时细胞结构的影响薄膜的影响。拟议的型号约0.100毫米薄膜的拟议工作将适用于广泛的应用程序，并将补充正在进行的工业合作伙伴PPG。成功后，这项研究将显着增强广泛应用的涂料的设计和处理。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的影响评估标准通过评估来支持的。

项目成果

Three-Dimensional Sag Tracking in Falling Liquid Films

下落液膜的三维流挂跟踪

• DOI: 10.1021/acs.langmuir.2c01232
• 发表时间: 2022
• 期刊: Langmuir
• 影响因子: 3.9
• 作者: Issa, Marola W.;Yu, Hairou;Roffin, Maria Chiara;Barancyk, Steven V.;Rock, Reza M.;Gilchrist, James F.;Wirth, Christopher L.
• 通讯作者: Wirth, Christopher L.