GOALI: Controlled Coating via Charged Droplet Impact and Deposition on Dielectric and Conducting Surfaces

GOALI：通过带电液滴撞击和沉积在介电和导电表面上来控制涂层

• 批准号: 1906497
• 负责人: Farzad Mashayek
• 金额: $ 42.87万
• 依托单位: University of Illinois at Chicago
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-15 至 2023-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1906497&HistoricalAwards=false
• 关键词: GOALI; Controlled; Coating; via; Charged

Many products used by consumers and industry are coated with layers of materials to prevent corrosion or to provide specialized surface properties. A common way to apply a coating is to spray a liquid onto the surface. The effectiveness and resilience of the coating often depends on intricate details of how the liquid drops that impact the surface bounce, splash, and spread over the surface to form the coating. Despite decades of research and practice, the fundamentals of coating processes, especially on products and machines with complex shapes, are not fully understood. This GOALI project is a joint effort between the University of Illinois - Chicago (UIC) and the Spraying Systems Company to conduct experiments and develop numerical simulations that will determine whether coating processes can be improved by applying an electric field to control details of drop dynamics as the drops impact the surface. The results of fundamental studies conducted at UIC will be used to develop spraying protocols that will be tested at Spraying Systems under industrially relevant conditions. The research team at UIC and representatives from Spraying Systems will also conduct a series of outreach activities to engage students at all academic levels, especially those from underrepresented groups, in the research and related demonstrations.The goal of this GOALI project is to investigate drop dynamics in the presence of an electric field to manipulate spray coating processes. The project will focus on droplet impact, deposition, and spreading on substrates attached to electrodes that generate an electric field. Experiments will be conducted to analyze droplet impact and spreading on dielectric and conducting surfaces to evaluate the droplet's shape and spreading difference. The influence of the morphology of the surface on droplet processes will be evaluated. Phase-field modeling of droplet impact onto dielectric and conducting surfaces will be carried out, using ab initio density function theory calculations to obtain surface binding energies. The results will be used to develops spraying protocols that will be tested in practice at Spraying Systems.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.

消费者和行业使用的许多产品都涂有一层材料，以防止腐蚀或提供专业的表面特性。 涂涂层的一种常见方法是将液体喷到表面上。 涂层的有效性和弹性通常取决于复杂的细节，即如何影响表面弹跳，飞溅和散布在表面上以形成涂层的细节。 尽管进行了数十年的研究和实践，但尚未完全了解涂料工艺的基础，尤其是在具有复杂形状的产品和机器上。 该目标项目是伊利诺伊大学 - 芝加哥大学（UIC）与喷雾系统公司之间的共同努力，以进行实验并开发数值模拟，以确定是否可以通过应用电场来控制掉落动态的详细信息，以确定是否可以改善涂层过程，因为下降会影响表面。 在UIC进行的基本研究的结果将用于制定喷涂方案，这些方案将在工业相关条件下在喷雾系统上进行测试。 UIC的研究团队和喷涂系统的代表还将进行一系列的外展活动，以吸引所有学术水平的学生，尤其是来自代表性不足的人群，在研究和相关的演示中。该目标项目的目的是调查在有电场的情况下调查Drop Dynamics，以操纵喷雾涂层过程。该项目将集中在液滴冲击，沉积和扩散上，并扩散在产生电场的电极上的基板上。 将进行实验，以分析液滴撞击并在介电和传导表面上扩散以评估液滴的形状和扩散差异。 将评估表面形态对液滴过程的影响。 液滴撞击在介电和传导表面上的相位场建模将使用始于初始密度函数理论计算以获得表面结合能。 结果将用于制定喷涂协议，这些协议将在喷雾系统中在实践中进行测试。该奖项反映了NSF的法定任务，并且使用基金会的知识分子优点和更广泛的影响审查标准，被认为值得通过评估来获得支持。

项目成果

Metamorphosis of trilobite-like drops on a surface: Electrically driven fingering

• DOI: 10.1063/5.0065378
• 发表时间: 2021-12
• 期刊: Physics of Fluids
• 影响因子: 4.6
• 作者: R. Granda;Vitaliy Yurkiv;F. Mashayek;A. Yarin

Air bubble entrapment during drop impact on solid and liquid surfaces

• DOI: 10.1016/j.ijmultiphaseflow.2022.103974
• 发表时间: 2022-01-20
• 期刊: INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
• 影响因子: 3.8
• 作者: Halder, Subhayan;Granda, Rafael;Mashayek, Farzad
• 通讯作者: Mashayek, Farzad

Drop impact onto polarized dielectric surface for controlled coating

• DOI: 10.1063/5.0054077
• 发表时间: 2021-06
• 期刊: Physics of Fluids
• 影响因子: 4.6
• 作者: A. Sankaran;Jingwei Wu;R. Granda;Vitaliy Yurkiv;F. Mashayek;A. Yarin

Dielectrophoretic stretching of drops of silicone oil: Experiments and multi-physical modeling

• DOI: 10.1063/5.0087219
• 发表时间: 2022-04
• 期刊: Physics of Fluids
• 影响因子: 4.6
• 作者: R. Granda;Gen Li;Vitaliy Yurkiv;F. Mashayek;A. Yarin

Water interaction with dielectric surface: A combined ab initio modeling and experimental study

• DOI: 10.1063/5.0046587
• 发表时间: 2021-04
• 期刊: Physics of Fluids
• 影响因子: 4.6
• 作者: Vitaliy Yurkiv;Jingwei Wu;Subhayan Halder;R. Granda;A. Sankaran;A. Yarin;F. Mashayek