Coalescence-induced jumping of microdroplets on superhydrophobic surfaces – A numerical study
Journal article, 2022

We develop a numerical framework for simulating the coalescence and jumping of microdroplets on superhydrophobic surfaces. The framework combines the VOF method with models for advancing and receding contact angles on a number of superhydrophobic surfaces. We demonstrate the temporal and spatial convergence of the framework and show agreement between our numerical results and other experimental studies. The capillary-inertial scaling is investigated together with the existence of a cut-off behaviour frequently observed in the lower size-range of that regime. We investigate findings in some of the previous studies that the cut-off behaviour can be attributed to viscosity effects and dissipation due to interaction with surface microstructures. We exemplify specific features related to the jumping process and the corresponding energy budget analysis when microdroplets coalesce and jump. We have tested droplets of a radius as small as 0.5 μm that are still jumping but recorded a decrease in the jumping velocity and the degree of energy conversion compared to the jumping of larger droplets. We argue and prove that strong capillary forces originating from the high curvature oscillations dissipate the energy of the system significantly faster in the case of microdroplets.

contact angle

VOF–Immersed boundary




Konstantinos Konstantinidis

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

Johan Göhl

Fraunhofer-Chalmers Centre

Andreas Mark

Fraunhofer-Chalmers Centre

Srdjan Sasic

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

Canadian Journal of Chemical Engineering

0008-4034 (ISSN)

Vol. 100 12, Special Issue Article 3517-3530

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 Physics Topics

Other Materials Engineering

Fluid Mechanics and Acoustics


C3SE (Chalmers Centre for Computational Science and Engineering)



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