Abstract Spray cooling is used in various fields and is particularly important in the metal industry because cooling has a significant effect on the quality of the products. In this study, experiments were conducted to investigate the effects of spray characteristics and electrostatic forces on spray cooling. A heated strip was cooled by spraying through a twin fluid atomizer with different air to liquid mass flow ratios (ALRs) between electrodes that applied a high voltage up to −15 kV. Two-dimensional spray characteristics such as the flux, size, and velocity of the droplets before impacting the strip were measured using phase Doppler anemometry, the cooling process was measured using a thermal imager. Based on these experiments, it was found that there were significantly different cooling behaviors according to the ALR. It was also found that among the different spray characteristics, the axial velocity is the most relevant to the cooling process. In addition, when electrostatic force was applied, through a comparison of the spray characteristics, it was confirmed that the spraying area increased, and the size of the droplets decreased and uniformized. However, the velocity was not significantly affected. As a result, it was verified that the heat transfer was enhanced by the electrostatic force.

中文翻译：

---

静电力及喷雾特性对立式热轧带钢喷雾冷却的影响研究

摘要 喷雾冷却应用于各个领域，在金属工业中尤为重要，因为冷却对产品质量有显着影响。在这项研究中，进行了实验以研究喷雾特性和静电力对喷雾冷却的影响。通过在施加高达 -15 kV 的高电压的电极之间具有不同空气与液体质量流量比 (ALR) 的双流体雾化器喷雾，加热条带被冷却。使用相位多普勒风速仪测量二维喷雾特性，例如液滴撞击带材之前的通量、尺寸和速度，使用热成像仪测量冷却过程。基于这些实验，发现根据 ALR 存在显着不同的冷却行为。还发现在不同的喷雾特性中，轴向速度与冷却过程最相关。此外，当施加静电力时，通过比较喷雾特性，确认喷雾面积增加，液滴尺寸减小且均匀。但是，速度没有受到显着影响。结果证实，静电力增强了传热。