Coupled Impact Dynamics of Double Droplets on Curved Cylindrical Surfaces

Droplet impact dynamics is a critical subject in interfacial fluid mechanics, with applications in aerospace, energy transport, microfluidics, and chemical engineering. This study investigates the impact behavior of double droplets on cylindrical surfaces, focusing on the interaction dynamics and the effects of parameters such as Weber number, droplet spacing, and surface curvature. Using numerical simulations, the study identifies three distinct rebound modes—twin-wing rebound, vertical rebound, and arc-shaped rebound—regulated by the Weber number and droplet spacing. Results show that increasing the Weber number enhances spreading and reduces contact time, with the arc-shaped rebound mode resulting in the shortest contact times. Droplet spacing further influences the dynamics, with wider spacing increasing contact time due to additional retraction phases. The findings provide valuable insights into the complex multi-field interactions governing droplet behavior on curved surfaces, offering new perspectives for the design of anti-icing coatings and curved microfluidic devices.