GOALI: Liquid Charging in Electrostatic Atomizers for Coating and Painting Applications

GOALI：用于涂料和喷漆应用的静电雾化器中的液体充电

• 批准号: 1505276
• 负责人: Farzad Mashayek
• 金额: $ 34.98万
• 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: 2015
• 资助国家: 美国
• 起止时间: 2015-08-01 至 2019-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1505276&HistoricalAwards=false
• 关键词: GOALI; Liquid; Charging; Electrostatic; Atomizers

The focus of this proposal is to investigate the process of the generation of electrical charges at the nozzles of sprays. This work will be done in collaboration with an industrial partner, Spraying Systems Company (SSCo), a large international manufacturer of spray products with a well-equipped research lab near the University of Illinois at Chicago. The co-PIs already have an on-going collaboration with SSCo. The motivation for the proposed research is to facilitate the commercialization of the electrostatic atomizers for coating and painting applications. Both of these applications would benefit significantly from the ability to control drop trajectories to avoid waste, provide precision deposition, and reduce the spread of hazardous materials. The proposed work aims at providing the understanding needed to achieve these performance characteristics. In addition, a low-cost computational model as a predictive tool for the design of these atomizers will be developed. The proposal includes concurrent studies based on theory, computation and experiments. This is a multiscale problem that will be tackled by theory to separate the analysis of the extremely thin near-electrode polarized layer, where an imbalance of charges exists, from the analysis of the electroneutral bulk flow with much larger dimensions. As a result of this separation, one would only need to solve for a Laplace equation (for the electric potential) along with the Navier-Stokes equations in the incompressible bulk flow. The solution of the Laplace and Navier-Stokes equations, which are coupled through the boundary conditions at the electrode, will be obtained numerically. Experiments are also proposed to (i) determine an empirical coefficient for the rate of reaction at the electrode surface, and (ii) provide data for validation of the computational model. The validated model will be implemented to conduct a detailed study on the effect of various parameters, such as the shape of the electrode. Collaboration with SSCo will provide experimental data for model validation and will facilitate the scale-up of the process. Broader impacts include industrial outreach and involvement of undergraduates and graduate students; creation of animations demonstrating the charging process. A successful electrostatic atomizer for non-conducting liquids will provide great advantages in sprays and coatings, which are materials that surround us and we use in everyday life.

这项提议的重点是研究喷雾器喷嘴电荷的产生过程。这项工作将与工业合作伙伴喷雾系统公司(SSCO)合作完成，该公司是一家大型国际喷雾产品制造商，在芝加哥伊利诺伊大学附近拥有设备齐全的研究实验室。共同投资促进机构已经与上海合作组织开展了持续的合作。拟议研究的动机是促进用于涂料和涂料应用的静电雾化器的商业化。这两种应用都将大大受益于控制滴落轨迹的能力，以避免浪费，提供精确的沉积，并减少危险材料的传播。拟议的工作旨在提供实现这些性能特征所需的理解。此外，还将开发一个低成本的计算模型，作为这些雾化器设计的预测工具。该提案包括基于理论、计算和实验的并行研究。这是一个多尺度的问题，理论上将把对存在电荷不平衡的极薄近电极极化层的分析与对尺寸大得多的电中和体流的分析分开。这种分离的结果是，人们只需要在不可压缩的整体流动中求解拉普拉斯方程(电势)和纳维尔-斯托克斯方程。通过电极处的边界条件耦合得到Laplace方程和Navier-Stokes方程的数值解。还建议进行实验，以(I)确定电极表面反应速度的经验系数，以及(Ii)为验证计算模型提供数据。验证后的模型将用于对电极形状等各种参数的影响进行详细的研究。与上海合作组织的合作将为模型验证提供实验数据，并将促进该过程的放大。更广泛的影响包括行业推广和本科生和研究生的参与；创建演示充电过程的动画。一种成功的非导电液体静电雾化器将在喷雾和涂层方面提供巨大的优势，这些材料是我们周围和日常生活中使用的材料。