Numerical study on the characteristics of single wetted flat wire with single droplet impact under the disturbance of airflow

Abstract In this paper, the dynamic process of droplet impacting on the wire is carried out. The CLSVOF method is used to simulate the single droplet impacting on the wet flat wire under the disturbance of airflow. After reasonable simplification, the two-dimensional mathematical model of the wire surface is established, which is used to analyze the influence of droplet diameter and initial velocity on droplet impact behavior. The characteristics of liquid film morphology, internal pressure field and velocity field during droplet impacting are studied, and combined with the re-entrainment in the mesh separator, the cause of droplet breakup is discussed. The numerical results show that the motion pattern of the liquid film after the droplet impacting on the wet wire can be divided into water waveform motion, crown motion and splashing motion which are determined by droplet diameter and initial velocity; At the beginning of the impact on the wet wire, the neck bulge at the contact point between the droplet and the surface film is caused by a large pressure drop in the neck region. The analysis of the velocity field verifies the kinematic discontinuity theory.