Horizontal Motion of a Superhydrophobic Substrate Affects the Drop Bouncing Dynamics

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

47 Scopus Citations
View graph of relations

Author(s)

  • Haiyang Zhan
  • Chenguang Lu
  • Cong Liu
  • Zuankai Wang
  • Cunjing Lv
  • And 1 others
  • Yahua Liu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number234503
Journal / PublicationPhysical Review Letters
Volume126
Issue number23
Online published11 Jun 2021
Publication statusPublished - 11 Jun 2021

Abstract

While the drop impact dynamics on stationary surfaces has been widely studied, the way a drop impacts a moving solid is by far less known. Here, we report the physical mechanisms of water drops impacting on superhydrophobic surfaces with horizontal motions. We find that a viscous force is created due to the entrainment of a thin air layer between the liquid and solid interfaces, which competes with the capillary and inertia forces, leading to an asymmetric elongation of the drop and an unexpected contact time reduction. Our experimental and theoretical results uncover consolidated scaling relations: the maximum spreading diameter is controlled by both the Weber and capillary numbers Dmax/D0∼We1/4Ca1/6, while the dimensionless contact time depends on the capillary number τ/τ0∼Ca-1/6. These findings strengthen our fundamental understandings of interactions between drops and moving solids and open up new opportunities for controlling the preferred water repellency through largely unexplored active approaches.

Citation Format(s)

Horizontal Motion of a Superhydrophobic Substrate Affects the Drop Bouncing Dynamics. / Zhan, Haiyang; Lu, Chenguang; Liu, Cong et al.
In: Physical Review Letters, Vol. 126, No. 23, 234503, 11.06.2021.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review