Influence of droplet charge on spray painting with a high-speed rotary bell

IF 1.9 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Q. Ye , O. Tiedje , J. Domnick
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Abstract

Numerical simulations of the spray coating process with an electrostatically supported high-speed rotary bell with internal charging were carried out, focusing on the effects of droplet charge on the spray formation, the film thickness distribution on the target and the transfer efficiency. From simulation results of the electrohydrodynamics (EHD) atomization process close to the bell edge, droplet size-to-charge relationships and initial droplet velocities were derived and used in the present coating simulation. Three different droplet charge models were applied and the resulting electric fields were analysed. It was found that the droplet size-to-charge relationship plays an important role for the spray-painting performance. Despite a relatively low influence of the charging model on the transfer efficiencies (TE), varying between 89 % and 94 % at an experimental TE of 94 %, significantly different film thickness distributions on the target were found. The best agreement between measured and simulated film thickness distributions was obtained using the proportionality between charge and droplet volume as indicated by the EHD-breakup simulations. Furthermore, effects of the initial droplet positions and velocities were analysed, comparing simulative and experimental results with respect to film thickness distributions on the target and droplet velocity profiles downstream the bell.
液滴电荷对高速转钟喷涂的影响
对静电支撑高速转钟内装药喷涂过程进行了数值模拟,重点研究了液滴装药对喷雾形成、靶膜厚度分布和传递效率的影响。根据钟形边缘附近电流体动力学(EHD)雾化过程的模拟结果,推导了液滴尺寸-电荷关系和初始液滴速度,并将其用于涂层模拟。应用了三种不同的液滴电荷模型,并对产生的电场进行了分析。结果表明,液滴尺寸与电荷的关系对喷涂性能起着重要作用。尽管充电模式对转移效率(TE)的影响相对较小,在实验中转移效率为94%时变化在89%到94%之间,但在靶上发现了显著不同的膜厚分布。利用电荷和液滴体积之间的比例关系,得到了测量和模拟膜厚分布之间的最佳一致性,正如ehd破裂模拟所表明的那样。此外,分析了初始液滴位置和速度的影响,比较了模拟和实验结果中膜厚分布对目标和液滴速度分布的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Electrostatics
Journal of Electrostatics 工程技术-工程:电子与电气
CiteScore
4.00
自引率
11.10%
发文量
81
审稿时长
49 days
期刊介绍: The Journal of Electrostatics is the leading forum for publishing research findings that advance knowledge in the field of electrostatics. We invite submissions in the following areas: Electrostatic charge separation processes. Electrostatic manipulation of particles, droplets, and biological cells. Electrostatically driven or controlled fluid flow. Electrostatics in the gas phase.
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