Enhancing condensation droplets removal on tube through periodic ultrasonic vibration

Abstract

Droplet condensation significantly impacts the heat transfer efficiency of equipment and can lead to frost formation, further exacerbating performance issues. Here, we propose a novel method for removing condensed droplets from tube surfaces using ultrasonic vibration, identifying three key processes: droplet aggregation, liquid film atomization, and liquid film shrinkage, which collectively facilitate droplet removal from the tube surface. Our analysis explores the effects of varying ultrasonic power and vibration modes on the atomization of condensation droplets. The results indicate that at a low ultrasonic power, extended vibration time improves atomization, while at higher power, periodic vibration yields superior results. Higher ultrasonic power results in a smaller axial average diameter of the droplets remaining on the tube surface. These finding provide valuable insights for enhancing heat transfer efficiency and mitigating frost formation in relevant applications.