Size effect on the coalescence-induced self-propelled droplet

Feng Chao Wang, Fuqian Yang, Ya Pu Zhao

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256 Scopus citations


An analysis based on the energy conservation is presented for the self-propelled droplet during coalescence of two droplets of the same size over a superhydrophobic rough surface. The self-propelled behavior occurs only for the coalescence of droplets with a certain range of radius. An analytical relation is established among the coalescence-induced velocity, surface energy, viscous dissipation, and droplet size if gravity is negligible. The coalescence-induced velocity increases with increasing droplet size to a maximum and then decreases with the size, which is in good accord with the experimental observation reported in the literature.

Original languageEnglish
Article number053112
JournalApplied Physics Letters
Issue number5
StatePublished - Jan 31 2011

Bibliographical note

Funding Information:
This work is jointly supported by the National Natural Science Foundation of China (NSFC, Grant Nos. 60936001 and 11072244), the National Basic Research Program of China (973 Program, Grant No. 2007CB310500), and Opening Fund of State Key Laboratory of Nonlinear Mechanics.

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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