Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.

Issue 1, 2015
Previous Article Next Article

Droplet coalescence on water repellant surfaces

Author affiliations


We report our hydrodynamic and energy analyses of droplet coalescence on water repellent surfaces including hydrophobic, superhydrophobic and oil-infused superhydrophobic surfaces. The receding contact angle has significant effects on the contact line dynamics since the contact line dissipation was more significant during the receding mode than advancing. The contact line dynamics is modeled by the damped harmonic oscillation equation, which shows that the damping ratio and angular frequency of merged droplets decrease as the receding contact angle increases. The fast contact line relaxation and the resulting decrease in base area during coalescence were crucial to enhance the mobility of coalescing sessile droplets by releasing more surface energy with reducing dissipation loss. The superhydrophobic surface converts ∼42% of the released surface energy to the kinetic energy via coalescence before the merged droplet jumps away from the surface, while oil-infused superhydrophobic and hydrophobic surfaces convert ∼30% and ∼22%, respectively, for the corresponding time. This work clarifies the mechanisms of the contact line relaxation and energy conversion during the droplet coalescence on water repellent surfaces, and helps develop water repellent condensers.

Graphical abstract: Droplet coalescence on water repellant surfaces

Back to tab navigation

Article information

25 Jul 2014
30 Sep 2014
First published
30 Sep 2014

Soft Matter, 2015,11, 154-160
Article type
Author version available

Droplet coalescence on water repellant surfaces

Y. Nam, D. Seo, C. Lee and S. Shin, Soft Matter, 2015, 11, 154
DOI: 10.1039/C4SM01647E

Social activity

Search articles by author