Coalescence-induced jumping of droplets from superhydrophobic surfaces - the effect of contact-angle hysteresis
Journal article, 2022

Droplets coalesce and jump from superhydrophobic surfaces, a result that stems from the dominance of capillary and inertial forces and the presence of high contact angles. This phenomenon has been a subject of intensive numerical research mostly for cases when the degree of hydrophobicity is described by a single contact-angle value (a static contact angle). The introduction of various degrees of contact-angle hysteresis complicates the numerical modeling of the jumping process due to the sensitivity to the effective value of the contact angle. We have developed and validated a comprehensive volume-of-fluid(VOF)-immersed boundary numerical framework that accounts for the effect of hysteresis by focusing on the representation of actual values of dynamic contact angles. By comparing the behavior of jumping droplets on superhydrophobic surfaces with several degrees of hysteresis (up to 15o), we quantified the influence of hysteresis on the jumping process and identified various stages of the merged droplet's detachment and re-attachment. The latter phenomena were observed in all our simulations with droplets of different initial radii. In all the cases with hysteresis, the merged droplet eventually jumps, but we point out the decrease in the jumping velocity as compared to cases with only a static contact angle imposed. Finally, by using the Kistler dynamic contact-angle model, we demonstrate the importance of accurately capturing the dynamic receding contact angle when droplets jump from superhydrophobic surfaces with various degrees of hysteresis.

capillary flows

contact lines

liquid bridge

interfacial flows

gas / liquid flows


Konstantinos Konstantinidis

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Johan Göhl

Fraunhofer-Chalmers Centre

Andreas Mark

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Srdjan Sasic

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Physics of Fluids

1070-6631 (ISSN) 1089-7666 (eISSN)

Vol. 34 11 113302

Unravelling the how, when and why of self-propelled and self-sustained particle self-cleaning mechanisms on superhydrophobic surfaces

Swedish Research Council (VR) (2019-04969), 2020-01-01 -- 2024-12-31.

Subject Categories

Applied Mechanics

Other Chemical Engineering

Other Physics Topics

Fluid Mechanics and Acoustics


C3SE (Chalmers Centre for Computational Science and Engineering)



More information

Latest update