Schlieren Visualization of Shaping Air during Operation of an Electrostatic Rotary Bell Sprayer: Impact of Shaping Air on Droplet Atomization and Transport
Schlieren Visualization of Shaping Air during Operation of an Electrostatic Rotary Bell Sprayer: Impact of Shaping Air on Droplet Atomization and Transport
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DOI：
10.3390/coatings8080279
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发表时间：
2018-08
期刊：
影响因子：
3.4
通讯作者：
A. D. Ahmad;Ahmad M. Abubaker;A. Salaimeh;Nelson K. Akafuah
中科院分区：
文献类型：
--
作者：
A. D. Ahmad;Ahmad M. Abubaker;A. Salaimeh;Nelson K. Akafuah
静电旋杯式喷雾器（ERBS）广泛应用于汽车行业。在ERBS中，使用离心力促进雾化，离心力将杯中的漆膜分解成杯边缘处的液滴。然后，液滴通过成形空气（SA）的流动和静电力输送到目标表面;这些液滴的特性极大地影响涂漆表面的质量和涂漆转移效率。在目前的论文中，一种新的基于纹影的可视化的成形空气中的油漆液滴的情况下进行了定性调查，以描绘成形空气的流动行为及其与液滴和液滴运输的相互作用。红外热成像流动可视化（IRFV）方法和液滴尺寸测量被用来补充纹影数据，以提供对成形空气-液滴相互作用的洞察。结果表明，不同的操作条件对SA的流动模式的影响，SA对二次雾化和液滴传输的影响。因此，这些实验方法联合收割机与用于优化SA配置的有用工具相结合，所述SA配置改善喷雾质量、液滴输送和ERBS操作的效率。
Electrostatic rotary bell sprayers (ERBSs) are widely used in the automotive industry. In ERBS, atomization is facilitated using centrifugal forces which disintegrate the paint film inside the cup into droplets at the cup edge. The droplets are then transported by the flow of a shaping air (SA) and electrostatic forces to a target surface; the characteristics of these droplets dramatically influence the quality of a painted surface and the painting transfer efficiency. In the current paper, a novel Schlieren-based visualization of the shaping air in the absence of paint droplets was performed during a qualitative investigation to delineate shaping air flow behavior and its interaction with droplets and droplet transport. An infrared thermographic flow visualization (IRFV) method and droplet size measurement were used to complement the Schlieren data for providing insight into shaping air-droplet interactions. The results demonstrated the impact of different operating conditions on the SA flow pattern, and the influence SA has on the secondary atomization and transport of droplets. Hence, these experimental methods combine with a useful tool for optimizing SA configurations that improve spray quality, droplet transport, and the efficiency of ERBS operations.