Mechanism of voltage frequency influence on vibration and discharge characteristics of water droplet attached to electrode

Abstract

The vibration and discharge phenomena of droplets in electric fields are the focus of various applications, while the relationship between them has not been fully investigated. In this study, a synchronous platform integrating high-speed camera observation and corona current measurement was utilized to explore the influence of voltage frequency on the vibration and corona discharge characteristics of the water droplet attached to the electrode. Results show that the voltage frequency has a significant influence on the vibration and discharge characteristics of the water droplet, and a strong correlation has been observed between these two characteristics. When approaching the dynamic natural vibration range, the droplet will cause a greater water loss due to intensive vibration, resulting in a smaller stable volume and, consequently, a smaller length vibration amplitude and discharge intensity. The forced vibration model has been enhanced to explain these phenomena. The findings further advanced the theory of electro-driven control of the water droplet in vibration and corona discharge.