초소수성 실린더 표면에 충돌하는 액적의 움직임에 관한 수치해석 연구

Abstract

Droplet impact is widely used in various engineering applications. Various conditions could affect the droplet evolution during impacting process. We have focused on geometrical effect from curved surface. Due to curvature of the wall, dynamics of the droplet would be quite different compared to the flat surface. We also paid great attentions to the contact line behavior. To augment the curvature effect, cylindrical surface with superhydrophobic characteristic was considered in this study. Very high advancing (165o) and receding angle (160o) associated with superhydrophobic surface makes distinctive difference in its behavior between axial and circumferential direction. We have numerical studied the impact process of the 3D droplet on cylindrical surface using Level Contour Reconstruction(LCRM) method. We found that impact behavior is pretty much same as flat surface in the axial direction. In circumferential direction, contact diameter has certain limit for higher impact velocity. Contact time of the droplet is also quite different compared to the flat surface in circumferential direction. At lower impact velocity, contact time of the droplet decrease rapidly with increased impact velocity but has negligible change at higher values.